10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C.  20549

FORM 10-Q

[X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2011

Or

[  ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______________ to _______________

		Commission file number:  001-31899 WHITING PETROLEUM CORPORATION
		(Exact name of registrant as specified in its charter)
Delaware			20-0098515
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)
1700 Broadway, Suite 2300 Denver, Colorado			80290-2300
(Address of principal executive offices)			(Zip code)
	(303) 837-1661
	(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes T   No  £

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).   Yes  T   No  £

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.  (Check one):

Large accelerated filerT Accelerated filer    £ Non-accelerated filer£ Smaller reporting company   £

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).       Yes£NoT

Number of shares of the registrant’s common stock outstanding at October 15, 2011:  117,380,843 shares.

TABLE OF CONTENTS

Glossary of Certain Definitions		1
PART I — FINANCIAL INFORMATION
Item 1.	Consolidated Financial Statements (Unaudited)	2
	Consolidated Balance Sheets as of September 30, 2011 and December 31, 2010	2
	Consolidated Statements of Income for the Three and Nine Months Ended September 30, 2011 and 2010	3
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2011 and 2010	4
	Consolidated Statements of Equity and Comprehensive Income for the Nine Months Ended September 30, 2011 and 2010	6
	Notes to Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	21
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	37
Item 4.	Controls and Procedures	39
PART II — OTHER INFORMATION
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 6.	Exhibits	40
	Certification by the Chairman and Chief Executive Officer
	Certification by the Vice President and Chief Financial Officer
	Written Statement of the Chairman and Chief Executive Officer
	Written Statement of the Vice President and Chief Financial Officer

GLOSSARY OF CERTAIN DEFINITIONS

Unless the context otherwise requires, the terms “we,” “us,” “our” or “ours” when used in this report refer to Whiting Petroleum Corporation, together with its consolidated subsidiaries.  When the context requires, we refer to these entities separately.

We have included below the definitions for certain terms used in this report:

“Bbl” One stock tank barrel, or 42 U.S. gallons liquid volume, used in this report in reference to oil and other liquid hydrocarbons.

“Bcf” One billion cubic feet of natural gas.

“BOE” One stock tank barrel equivalent of oil, calculated by converting natural gas volumes to equivalent oil barrels at a ratio of six Mcf to one Bbl of oil.

“FASB” The Financial Accounting Standards Board.

“FASB ASC” The FASB Accounting Standards Codification.

“GAAP” Generally accepted accounting principles in the United States of America.

“MBbl” One thousand barrels of oil or other liquid hydrocarbons.

“MBOE” One thousand BOE.

“MBOE/d” One MBOE per day.

“Mcf” One thousand cubic feet of natural gas.

“MMBbl” One million Bbl.

“MMBOE” One million BOE.

“MMBtu” One million British Thermal Units.

“MMcf” One million cubic feet of natural gas.

“MMcf/d” One MMcf per day.

 “plugging and abandonment” Refers to the sealing off of fluids in the strata penetrated by a well so that the fluids from one stratum will not escape into another or to the surface.  Regulations of many states require plugging of abandoned wells.

 “working interest” The interest in a crude oil and natural gas property (normally a leasehold interest) that gives the owner the right to drill, produce and conduct operations on the property and a share of production, subject to all royalties, overriding royalties and other burdens and to all costs of exploration, development and operations and all risks in connection therewith.

1

PART I – FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements

WHITING PETROLEUM CORPORATION

CONSOLIDATED BALANCE SHEETS (Unaudited)

(In thousands, except share and per share data)

	September 30,			December 31,
ASSETS	2011			2010
Current assets:
Cash and cash equivalents	$	6,088		$	18,952
Accounts receivable trade, net		230,942			199,713
Prepaid expenses and other		31,540			14,878
Total current assets		268,570			233,543
Property and equipment:
Oil and gas properties, successful efforts method:
Proved properties		6,724,836			5,661,619
Unproved properties		362,963			226,336
Other property and equipment		144,158			98,092
Total property and equipment		7,231,957			5,986,047
Less accumulated depreciation, depletion and amortization		(1,961,365	)		(1,630,824	)
Total property and equipment, net		5,270,592			4,355,223
Debt issuance costs		31,782			34,226
Other long-term assets		76,562			25,785
TOTAL ASSETS	$	5,647,506		$	4,648,777
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable trade	$	30,389		$	35,016
Accrued capital expenditures		112,526			84,789
Accrued liabilities and other		133,752			153,062
Revenues and royalties payable		104,185			82,124
Taxes payable		34,139			30,291
Derivative liabilities		20,682			69,375
Deferred income taxes		2,713			4,548
Total current liabilities		438,386			459,205
Long-term debt		1,200,000			800,000
Deferred income taxes		786,932			539,071
Derivative liabilities		31,424			95,256
Production Participation Plan liability		84,584			81,524
Asset retirement obligations		82,842			76,994
Deferred gain on sale		32,618			41,460
Other long-term liabilities		26,669			23,952
Total liabilities		2,683,455			2,117,462
Commitments and contingencies
Equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; 6.25% convertible perpetual preferred stock, 172,400 shares issued and outstanding as of September 30, 2011 and 172,500 shares issued and outstanding as of December 31, 2010, aggregate liquidation preference of $17,240,000 at September 30, 2011		-			-
Common stock, $0.001 par value, 300,000,000 shares authorized; 118,109,058 issued and 117,380,843 outstanding as of September 30, 2011, 117,967,876 issued and 117,098,506 outstanding as of December 31, 2010 (1)		118			59
Additional paid-in capital		1,550,800			1,549,822
Accumulated other comprehensive income		1,144			5,768
Retained earnings		1,403,656			975,666
Total Whiting shareholders’ equity		2,955,718			2,531,315
Noncontrolling interest		8,333			-
Total equity		2,964,051			2,531,315
TOTAL LIABILITIES AND EQUITY	$	5,647,506		$	4,648,777

(1)	All common share amounts (except par value and par value per share amounts) have been retroactively restated as of December 31, 2010 to reflect the Company’s two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.
See notes to consolidated financial statements.

2

WHITING PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF INCOME (Unaudited)

(In thousands, except per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
REVENUES AND OTHER INCOME:
Oil and natural gas sales	$	468,573		$	365,239		$	1,368,121		$	1,068,961
Gain on hedging activities		1,871			4,383			7,326			19,641
Amortization of deferred gain on sale		3,518			3,854			10,455			11,613
Gain on sale of properties		13,505			-			14,732			1,918
Interest income and other		90			258			351			498
Total revenues and other income		487,557			373,734			1,400,985			1,102,631
COSTS AND EXPENSES:
Lease operating		77,630			69,001			222,937			197,586
Production taxes		34,510			26,193			100,412			77,341
Depreciation, depletion and amortization		122,890			97,704			340,868			289,836
Exploration and impairment		18,918			10,500			61,326			37,915
General and administrative		23,144			19,480			62,470			48,516
Interest expense		16,130			14,579			45,867			45,903
Loss on early extinguishment of debt		-			6,235			-			6,235
Change in Production Participation Plan liability		853			3,858			3,060			9,550
Commodity derivative (gain) loss, net		(138,892	)		31,765			(118,071	)		(46,654	)
Total costs and expenses		155,183			279,315			718,869			666,228
INCOME BEFORE INCOME TAXES		332,374			94,419			682,116			436,403
INCOME TAX EXPENSE (BENEFIT):
Current		975			(170	)		4,590			6,468
Deferred		125,164			36,057			248,728			159,475
Total income tax expense (benefit)		126,139			35,887			253,318			165,943
NET INCOME		206,235			58,532			428,798			270,460
Preferred stock dividends		(269	)		(52,920	)		(808	)		(63,701	)
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$	205,966		$	5,612		$	427,990		$	206,759
EARNINGS PER COMMON SHARE(1):
Basic	$	1.75		$	0.06		$	3.65		$	2.02
Diluted	$	1.74		$	0.06		$	3.62		$	2.00
WEIGHTED AVERAGE SHARES OUTSTANDING(1) :
Basic		117,381			104,296			117,333			102,712
Diluted		118,539			104,907			118,572			104,192

(1)	All share and per share amounts have been retroactively restated for the 2010 periods to reflect the Company’s two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.
See notes to consolidated financial statements.

3

WHITING PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

(In thousands)

	Nine Months Ended September 30,
	2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	428,798		$	270,460
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization		340,868			289,836
Deferred income tax expense		248,728			159,475
Amortization of debt issuance costs and debt discount		6,357			8,525
Stock-based compensation		10,086			6,585
Amortization of deferred gain on sale		(10,455	)		(11,613	)
Gain on sale of properties		(14,732	)		(1,918	)
Undeveloped leasehold and oil and gas property impairments		24,920			12,054
Exploratory dry hole costs		4,714			2,796
Loss on early extinguishment of debt		-			6,235
Change in Production Participation Plan liability		3,060			9,550
Unrealized (gain) loss on derivative contracts		(151,047	)		(82,213	)
Other non-current		(8,285	)		(4,495	)
Changes in current assets and liabilities:
Accounts receivable trade		(31,229	)		(30,273	)
Prepaid expenses and other		61			(637	)
Accounts payable trade and accrued liabilities		(13,999	)		49,464
Revenues and royalties payable		22,061			29,221
Taxes payable		3,848			7,215
Net cash provided by operating activities		863,754			720,267
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash acquisition capital expenditures		(233,521	)		(102,256	)
Drilling and development capital expenditures		(1,077,605	)		(473,697	)
Proceeds from sale of oil and gas properties		69,246			7,875
Issuance of note receivable		(25,000	)		-
Net cash used in investing activities		(1,266,880	)		(568,078	)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of 6.5% Senior Subordinated Notes due 2018		-			350,000
Redemption of 7.25% Senior Subordinated Notes due 2012		-			(150,000	)
Redemption of 7.25% Senior Subordinated Notes due 2013		-			(223,988	)
Premium on induced conversion of 6.25% convertible perpetual preferred stock		-			(47,529	)
Contributions from noncontrolling interest		2,500			-
Preferred stock dividends paid		(808	)		(16,172	)
Long-term borrowings under credit agreement		1,380,000			850,000
Repayments of long-term borrowings under credit agreement		(980,000	)		(910,000	)
Debt issuance costs		(2,381	)		(7,570	)
Restricted stock used for tax withholdings		(9,049	)		(5,679	)
Net cash provided by (used in) financing activities		390,262			(160,938	)
NET CHANGE IN CASH AND CASH EQUIVALENTS		(12,864	)		(8,749	)
CASH AND CASH EQUIVALENTS:
Beginning of period		18,952			11,960
End of period	$	6,088		$	3,211
See notes to consolidated financial statements.				(Continued)

4

WHITING PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

(In thousands)

	Nine Months Ended September 30,
	2011		2010
NONCASH INVESTING ACTIVITIES:
Accrued capital expenditures	$	112,526	$	73,682
NONCASH FINANCING ACTIVITIES:
Contributions from noncontrolling interest	$	5,833	$	-
Issuance of common stock related to the induced conversion of preferred stock	$	-	$	317,406
Preferred stock cancelled in connection with its induced conversion	$	-	$	(317,406	)
See notes to consolidated financial statements.			(Concluded)

5

WHITING PETROLEUM CORPORATION

CONSOLIDATED STATEMENTS OF EQUITY

AND COMPREHENSIVE INCOME (Unaudited)

(In thousands)

	Preferred Stock					Common Stock(1)				Additional Paid-			Accumulated Other Comprehensive			Retained			Total Whiting Shareholders’			Noncontrolling					Comprehensive
	Shares		Amount			Shares		Amount		in Capital			Income (Loss)			Earnings			Equity			Interest		Total Equity			Income (Loss)
BALANCES-January 1, 2010	3,450		$	3		102,728		$	51	$	1,546,635		$	20,413		$	702,983		$	2,270,085		$	-	$	2,270,085
Net income	-			-		-			-		-			-			270,460			270,460			-		270,460		$	270,460
OCI amortization on de-designated hedges, net of taxes of $7,242	-			-		-			-		-			(12,399	)		-			(12,399	)		-		(12,399	)		(12,399	)
Total comprehensive income																											$	258,061
Induced conversion of convertible perpetual preferred stock	(3,277	)		(3	)	15,098			8		(5	)		-			(47,529	)		(47,529	)		-		(47,529	)
Restricted stock issued	-			-		325			-		-			-			-			-			-		-
Restricted stock forfeited	-			-		(22	)		-		-			-			-			-			-		-
Restricted stock used for tax withholdings	-			-		(156	)		-		(5,679	)		-			-			(5,679	)		-		(5,679	)
Stock-based compensation	-			-		-			-		6,585			-			-			6,585			-		6,585
Preferred dividends paid	-			-		-			-		-			-			(16,172	)		(16,172	)		-		(16,172	)
BALANCES-September 30, 2010	173		$	-		117,973		$	59	$	1,547,536		$	8,014		$	909,742		$	2,465,351		$	-	$	2,465,351
BALANCES-January 1, 2011	173		$	-		117,968		$	59	$	1,549,822		$	5,768		$	975,666		$	2,531,315		$	-	$	2,531,315
Net income	-			-		-			-		-			-			428,798			428,798			-		428,798		$	428,798
OCI amortization on de-designated hedges, net of taxes of $2,702	-			-		-			-		-			(4,624	)		-			(4,624	)		-		(4,624	)		(4,624	)
Total comprehensive income																											$	424,174
Conversion of preferred stock to common	(1	)		-		1			-		-			-			-			-			-		-
Two-for-one stock split	-			-		-			59		(59	)		-			-			-			-		-
Contributions from noncontrolling interest	-			-		-			-		-			-			-			-			8,333		8,333
Restricted stock issued	-			-		304			-		-			-			-			-			-		-
Restricted stock forfeited	-			-		(16	)		-		-			-			-			-			-		-
Restricted stock used for tax withholdings	-			-		(148	)		-		(9,049	)		-			-			(9,049	)		-		(9,049	)
Stock-based compensation	-			-		-			-		10,086			-			-			10,086			-		10,086
Preferred dividends paid	-			-		-			-		-			-			(808	)		(808	)		-		(808	)
BALANCES-September 30, 2011	172		$	-		118,109		$	118	$	1,550,800		$	1,144		$	1,403,656		$	2,955,718		$	8,333	$	2,964,051

(1)	All common share amounts (except par values) have been retroactively restated for all periods presented to reflect the Company’s two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.
See notes to consolidated financial statements.

6

WHITING PETROLEUM CORPORATION

NOTES TO CONSOLIDATED

FINANCIAL STATEMENTS (Unaudited)

1.           BASIS OF PRESENTATION

Description of Operations—Whiting Petroleum Corporation, a Delaware corporation, is an independent oil and gas company that acquires, exploits, develops and explores for crude oil, natural gas and natural gas liquids primarily in the Permian Basin, Rocky Mountains, Mid-Continent, Gulf Coast and Michigan regions of the United States.  Unless otherwise specified or the context otherwise requires, all references in these notes to “Whiting” or the “Company” are to Whiting Petroleum Corporation and its consolidated subsidiaries.

Consolidated Financial Statements—The unaudited consolidated financial statements include the accounts of Whiting Petroleum Corporation, its consolidated subsidiaries and Whiting’s pro rata share of the accounts of Whiting USA Trust I pursuant to Whiting’s 15.8% ownership interest.  Investments in entities which give Whiting significant influence, but not control, over the investee are accounted for using the equity method.  Under the equity method, investments are stated at cost plus the Company’s equity in undistributed earnings and losses.  All intercompany balances and transactions have been eliminated upon consolidation.  These financial statements have been prepared in accordance with GAAP for interim financial reporting.  In the opinion of management, the accompanying financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company’s interim results.  However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year.  Whiting’s 2010 Annual Report on Form 10-K includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Form 10-Q.  Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in Whiting’s 2010 Annual Report on Form 10-K.

Earnings Per Share—Basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during each period.  Diluted earnings per common share is calculated by dividing adjusted net income available to common shareholders by the weighted average number of diluted common shares outstanding, which includes the effect of potentially dilutive securities.  Potentially dilutive securities for the diluted earnings per share calculations consist of unvested restricted stock awards and outstanding stock options using the treasury method, as well as convertible perpetual preferred stock using the if-converted method.  In the computation of diluted earnings per share, excess tax benefits that would be created upon the assumed vesting of unvested restricted shares or the assumed exercise of stock options (i.e. hypothetical excess tax benefits) are included in the assumed proceeds component of the treasury share method to the extent that such excess tax benefits are more likely than not to be realized.  When a loss from continuing operations exists, all potentially dilutive securities are anti-dilutive and are therefore excluded from the computation of diluted earnings per share.

2.           ACQUISITIONS AND DIVESTITURES

2011 Acquisitions

On July 28, 2011, the Company completed the acquisition of approximately 23,400 net acres and one well in the Missouri Breaks prospect in Richland County, Montana for an unadjusted purchase price of $46.9 million.  Disclosures of pro forma revenues and net income for this acquisition are not material and have not been presented accordingly.

7

On March 18, 2011, Whiting and an unrelated third party formed Sustainable Water Resources, LLC (“SWR”) to develop a water project in the state of Colorado.  The Company contributed $25.0 million for a 75% interest in SWR, and the 25% noncontrolling interest in SWR was ascribed a fair value of $8.3 million, which consisted of $2.5 million in cash contributions, as well as $5.8 million in intangible and fixed assets contributed to the joint venture.There were no significant results of operations attributable to the noncontrolling interest since its inception through the period ended September 30, 2011.

On February 15, 2011, the Company completed the acquisition of 6,000 net undeveloped acres and additional working interests in the Pronghorn field in Billings and Stark Counties, North Dakota, for an aggregate purchase price of $40.0 million.

2011 Divestitures

On September 29, 2011, Whiting sold its interest in several non-core oil and gas producing properties located in the Karnes, Live Oak and DeWitt counties of Texas for total cash proceeds of $64.8 million, resulting in a pre-tax gain on sale of $12.3 million.  Whiting used the net proceeds from the property sale to repay a portion of the debt outstanding under its credit agreement.

2010 Acquisitions

In September 2010, Whiting acquired operated interests in 19 producing oil and gas wells, undeveloped acreage, and gathering lines, all of which are located on approximately 20,400 gross (16,100 net) acres in Weld County, Colorado.  The aggregate purchase price was $19.2 million; substantially all of which was allocated to the oil and gas properties and acreage acquired.  Disclosures of pro forma revenues and net income for this acquisition are not material and have not been presented accordingly.

In August 2010, Whiting acquired oil and gas leasehold interests covering approximately 112,000 gross (90,200 net) acres in the Montana portion of the Williston Basin for $26.0 million.  The undeveloped acreage is located in Roosevelt and Sheridan counties.

2010 Divestitures

There were no significant divestitures during the year ended December 31, 2010.

3.           LONG-TERM DEBT

Long-term debt consisted of the following at September 30, 2011 and December 31, 2010 (in thousands):

	September 30, 2011		December 31, 2010
Credit agreement	$	600,000	$	200,000
6.5% Senior Subordinated Notes due 2018		350,000		350,000
7% Senior Subordinated Notes due 2014		250,000		250,000
Total debt	$	1,200,000	$	800,000

Credit Agreement—Whiting Oil and Gas Corporation (“Whiting Oil and Gas”), the Company’s wholly-owned subsidiary, has a credit agreement with a syndicate of banks.  As of September 30, 2011, this credit facility had a borrowing base of $1.1 billion with $498.6 million of available borrowing capacity, which is net of $600.0 million in borrowings and $1.4 million in letters of credit outstanding.  The credit agreement provides for interest only payments until April 2016, when the agreement expires and all outstanding borrowings are due.  In October 2011, Whiting Oil and Gas entered into an amendment to its existing credit agreement that increased the borrowing base under the facility from $1.1 billion to $1.5 billion.

8

The borrowing base under the credit agreement is determined at the discretion of the lenders, based on the collateral value of the Company’s proved reserves that have been mortgaged to its lenders, and is subject to regular redeterminations on May 1 and November 1 of each year, as well as special redeterminations described in the credit agreement, in each case which may reduce the amount of the borrowing base.  A portion of the revolving credit facility in an aggregate amount not to exceed $50.0 million may be used to issue letters of credit for the account of Whiting Oil and Gas or other designated subsidiaries of the Company.  As of September 30, 2011, $48.6 million was available for additional letters of credit under the agreement.

Interest accrues at the Company’s option at either (i) a base rate for a base rate loan plus the margin in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% or an adjusted LIBOR rate plus 1.00%, or (ii) an adjusted LIBOR rate for a Eurodollar loan plus the margin in the table below.  Additionally, the Company also incurs commitment fees as set forth in the table below on the unused portion of the lesser of the aggregate commitments of the lenders or the borrowing base, and are included as a component of interest expense.  At September 30, 2011, the weighted average interest rate on the outstanding principal balance under the credit agreement was 2.4%.

                   

Ratio of Outstanding Borrowings to Borrowing Base	Applicable Margin for Base Rate Loans	Applicable Margin for Eurodollar Loans	Commitment Fee
Less than 0.25 to 1.0	0.50%	1.50%	0.375%
Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0	0.75%	1.75%	0.375%
Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0	1.00%	2.00%	0.50%
Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0	1.25%	2.25%	0.50%
Greater than or equal to 0.90 to 1.0	1.50%	2.50%	0.50%

The credit agreement contains restrictive covenants that may limit the Company’s ability to, among other things, incur additional indebtedness, sell assets, make loans to others, make investments, enter into mergers, enter into hedging contracts, incur liens and engage in certain other transactions without the prior consent of its lenders.  Except for limited exceptions, which include the payment of dividends on the Company’s 6.25% convertible perpetual preferred stock, the credit agreement also restricts our ability to make any dividend payments or distributions on its common stock.  These restrictions apply to all of the net assets of the subsidiaries.  The credit agreement requires the Company, as of the last day of any quarter, (i) to not exceed a total debt to the last four quarters’ EBITDAX ratio (as defined in the credit agreement) of 4.25 to 1.0 for quarters ending prior to and on December 31, 2012 and 4.0 to 1.0 for quarters ending March 31, 2013 and thereafter and (ii) to have a consolidated current assets to consolidated current liabilities ratio (as defined in the credit agreement and which includes an add back of the available borrowing capacity under the credit agreement) of not less than 1.0 to 1.0.  The Company was in compliance with its covenants under the credit agreement as of September 30, 2011.

The obligations of Whiting Oil and Gas under the amended credit agreement are secured by a first lien on substantially all of Whiting Oil and Gas’ properties included in the borrowing base for the credit agreement.  The Company has guaranteed the obligations of Whiting Oil and Gas under the credit agreement and has pledged the stock of Whiting Oil and Gas as security for its guarantee.

Senior Subordinated Notes—In October 2005, the Company issued at par $250.0 million of 7% Senior Subordinated Notes due February 2014.  The estimated fair value of these notes was $266.3 million as of September 30, 2011, based on quoted market prices for these same debt securities.

9

Redemption of 7.25% Senior Subordinated Notes Due 2012 and 2013—In September 2010, the Company paid $383.5 million to redeem all of its $150.0 million aggregate principal amount of 7.25% Senior Subordinated Notes due 2012 and all of its $220.0 million aggregate principal amount of 7.25% Senior Subordinated Notes due 2013, which consisted of a redemption price of 100.00% for the 2012 notes and 101.8125% for the 2013 notes and included the payment of accrued and unpaid interest on such notes.  The Company financed the redemption of the 2012 and 2013 notes with borrowings under its credit agreement.  As a result of the redemption, Whiting recognized a $6.2 million loss on early extinguishment of debt, which consisted of a cash charge of $4.0 million related to the redemption premium on the 2013 notes and a non-cash charge of $2.2 million related to the acceleration of debt discounts and unamortized debt issuance costs.

Issuance of 6.5% Senior Subordinated Notes Due 2018—In September 2010, the Company issued at par $350.0 million of 6.5% Senior Subordinated Notes due October 2018.  The Company used the net proceeds from this issuance to repay a portion of the debt, which was borrowed to redeem its 2012 and 2013 notes, outstanding under its credit agreement.  The estimated fair value of these notes was $349.6 million as of September 30, 2011, based on quoted market prices for these same debt securities.

The notes are unsecured obligations of Whiting Petroleum Corporation and are subordinated to all of the Company’s senior debt, which currently consists of Whiting Oil and Gas’ credit agreement.  The Company’s obligations under the 2014 notes are fully, unconditionally, jointly and severally guaranteed by the Company’s 100%-owned subsidiaries, Whiting Oil and Gas and Whiting Programs, Inc. (the “2014 Guarantors”).  Additionally, the Company’s obligations under the 2018 notes are fully, unconditionally, jointly and severally guaranteed by the Company’s 100%-owned subsidiary, Whiting Oil and Gas (collectively with the 2014 Guarantors, the “Guarantors”).  Any subsidiaries other than the Guarantors are minor subsidiaries as defined by Rule 3-10(h)(6) of Regulation S-X of the Securities and Exchange Commission.  Whiting Petroleum Corporation has no assets or operations independent of this debt and its investments in guarantor subsidiaries.

4.           ASSET RETIREMENT OBLIGATIONS

The Company’s asset retirement obligations represent the estimated future costs associated with the plugging and abandonment of oil and gas wells, removal of equipment and facilities from leased acreage, and land restoration (including removal of certain onshore and offshore facilities in California) in accordance with applicable local, state and federal laws.  The Company follows FASB ASC Topic 410, Asset Retirement and Environmental Obligations, to determine its asset retirement obligation amounts by calculating the present value of the estimated future cash outflows associated with its plug and abandonment obligations.  The current portions at September 30, 2011 and December 31, 2010 were $4.4 million and $6.1 million, respectively, and are included in accrued liabilities and other.  Revisions to the liability could occur due to changes in estimated abandonment costs or well economic lives, or if federal or state regulators enact new requirements regarding the abandonment of wells.  The following table provides a reconciliation of the Company’s asset retirement obligations for the nine months ended September 30, 2011 (in thousands):

Asset retirement obligation at January 1, 2011	$	83,083
Additional liability incurred		1,711
Revisions in estimated cash flows		419
Accretion expense		5,949
Obligations on sold properties		(790	)
Liabilities settled		(3,147	)
Asset retirement obligation at September 30, 2011	$	87,225

5.           DERIVATIVE FINANCIAL INSTRUMENTS

The Company is exposed to certain risks relating to its ongoing business operations, and Whiting uses derivative instruments to manage its commodity price risk.  Whiting follows FASB ASC Topic 815, Derivatives and Hedging, to account for its derivative financial instruments.

10

Commodity Derivative Contracts—Historically, prices received for crude oil and natural gas production have been volatile because of seasonal weather patterns, supply and demand factors, worldwide political factors and general economic conditions.  Whiting enters into derivative contracts, primarily costless collars, to achieve a more predictable cash flow by reducing its exposure to commodity price volatility.  Commodity derivative contracts are thereby used to ensure adequate cash flow to fund the Company’s capital programs and to manage returns on acquisitions and drilling programs.  Costless collars are designed to establish floor and ceiling prices on anticipated future oil and gas production.  While the use of these derivative instruments limits the downside risk of adverse price movements, they may also limit future revenues from favorable price movements.  The Company does not enter into derivative contracts for speculative or trading purposes.

Whiting Derivatives.  The table below details the Company’s costless collar derivatives, including its proportionate share of Whiting USA Trust I (the “Trust”) derivatives, entered into to hedge forecasted crude oil and natural gas production revenues, as of October 21, 2011.

	Whiting Petroleum Corporation
	Contracted Volumes		Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)	Natural Gas (Mcf)	Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011	2,712,764	103,663	$61.00 - $  98.31	$7.00 - $14.25
Jan – Dec 2012	9,105,091	384,002	$61.93 - $105.48	$6.50 - $14.27
Jan – Nov 2013	3,090,000	-	$47.64 - $  89.90	n/a
Total	14,907,855	487,665

Derivatives Conveyed to Whiting USA Trust I.  In connection with the Company’s conveyance in April 2008 of a term net profits interest to the Trust and related sale of 11,677,500 Trust units to the public, the right to any future hedge payments made or received by Whiting on certain of its derivative contracts have been conveyed to the Trust, and therefore such payments will be included in the Trust’s calculation of net proceeds.  Under the terms of the aforementioned conveyance, Whiting retains 10% of the net proceeds from the underlying properties.  Whiting’s retention of 10% of these net proceeds, combined with its ownership of 2,186,389 Trust units, results in third-party public holders of Trust units receiving 75.8%, and Whiting retaining 24.2%, of the future economic results of commodity derivative contracts conveyed to the Trust.  The relative ownership of the future economic results of such commodity derivatives is reflected in the tables below.  No additional hedges are allowed to be placed on Trust assets.

The 24.2% portion of Trust derivatives that Whiting has retained the economic rights to (and which are also included in the table above) are as follows:

	Whiting Petroleum Corporation
	Contracted Volumes		Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)	Natural Gas (Mcf)	Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011	27,764	103,663	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012	105,091	384,002	$74.00 - $141.72	$6.50 - $14.27
Total	132,855	487,665

11

The 75.8% portion of Trust derivative contracts of which Whiting has transferred the economic rights to third-party public holders of Trust units (and which have not been reflected in the above tables) are as follows:

	Third-party Public Holders of Trust Units
	Contracted Volumes		Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)	Natural Gas (Mcf)	Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011	86,962	324,698	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012	329,171	1,202,784	$74.00 - $141.72	$6.50 - $14.27
Total	416,133	1,527,482

Discontinuance of Cash Flow Hedge Accounting—Prior to April 1, 2009, the Company designated a portion of its commodity derivative contracts as cash flow hedges, whose unrealized fair value gains and losses were recorded to other comprehensive income.  Effective April 1, 2009, however, the Company elected to de-designate all of its commodity derivative contracts that had been previously designated as cash flow hedges and elected to discontinue hedge accounting prospectively.  As a result, such mark-to-market values at March 31, 2009 were frozen in accumulated other comprehensive income as of the de-designation date and are being reclassified into earnings as the original hedged transactions affect income.  As of September 30, 2011, accumulated other comprehensive income amounted to $1.8 million ($1.1 million net of tax), which consisted entirely of unrealized deferred gains and losses on commodity derivative contracts that had been previously designated as cash flow hedges.  During the next twelve months, the Company expects to reclassify into earnings from accumulated other comprehensive income net after-tax gains of $2.3 million related to de-designated commodity hedges.  Currently, the Company recognizes all gains and losses from changes in commodity derivative fair values immediately in earnings rather than deferring any such amounts in accumulated other comprehensive income.

Embedded Commodity Derivative Contracts—As of September 30, 2011, Whiting had entered into certain contracts for oil field goods or services, whereby the price adjustment clauses for such goods or services are linked to changes in NYMEX crude oil prices.  The Company has determined that the portions of these contracts linked to NYMEX oil prices are not clearly and closely related to the host contracts, and the Company has therefore bifurcated these embedded pricing features from their host contracts and reflected them at fair value in the consolidated financial statements.

Drilling Rig Contracts.  As of September 30, 2011, Whiting had entered into four contracts with drilling rig companies, whereby the rig day rates included price adjustment clauses that are linked to changes in NYMEX crude oil prices.  These drilling rig contracts have various termination dates ranging from November 2011 to September 2014.  The price adjustment formulas in the rig contracts stipulate that with every $10 increase or decrease in the price of NYMEX crude, the cost of drilling rig day rates to the Company will likewise increase or decrease by specific dollar amounts as set forth in each of the individual contracts.  As of September 30, 2011, the aggregate estimated fair value of the embedded derivatives in these drilling rig contracts was an asset of $2.5 million.

As global crude oil prices increase or decrease, the demand for drilling rigs in North America similarly increases and decreases.  Because the supply of onshore drilling rigs in North America is fairly inelastic, these changes in rig demand cause drilling rig day rates to increase or decrease in tandem with crude oil price fluctuations.  When the Company enters into a long-term drilling rig contract that has a fixed rig day rate, which does not increase or decrease with changes in oil prices, the Company is exposed to the risk of paying higher than the market day rate for drilling rigs in a climate of declining oil prices.  This in turn could have a negative impact on the Company’s oil and gas well economics.  As a result, the Company reduces its exposure to this risk by entering into certain drilling contracts which have day rates that fluctuate in tandem with changes in oil prices.

12

CO2 Purchase Contract.  In May 2011, Whiting entered into a long-term contract to purchase CO2 from 2015 through 2029 for use in its enhanced oil recovery project that is being carried out at its North Ward Estes field in Texas.  The price per Mcf of CO2 purchased under this agreement increases or decreases as the average price of NYMEX crude oil likewise increases or decreases.  As of September 30, 2011, the estimated fair value of the embedded derivative in this CO2 purchase contract was an asset of $15.1 million.

Although CO2 is not a commodity that is actively traded on a public exchange, the market price for CO2 generally fluctuates in tandem with increases or decreases in crude oil prices.  When Whiting enters into a long-term CO2 purchase contract where the price of CO2 is fixed and does not adjust with changes in oil prices, the Company is exposed to the risk of paying higher than the market rate for CO2 in a climate of declining oil and CO2 prices.  This in turn could have a negative impact on the project economics of the Company’s CO2 flood at North Ward Estes.  As a result, the Company reduces its exposure to this risk by entering into certain CO2 purchase contracts which have prices that fluctuate along with changes in crude oil prices.

Derivative Instrument Reporting—All derivative instruments are recorded on the consolidated balance sheet at fair value, other than derivative instruments that meet the “normal purchase normal sales” exclusion.  The following tables summarize the location and fair value amounts of all derivative instruments in the consolidated balance sheets (in thousands):

		Fair Value
Not Designated as ASC 815 Hedges	Balance Sheet Classification	September 30,  2011		December 31, 2010
Derivative assets:
Commodity contracts	Prepaid expenses and other	$	19,956	$	4,231
Embedded commodity contracts	Prepaid expenses and other		998		-
Commodity contracts	Other long-term assets		1,801		3,961
Embedded commodity contracts	Other long-term assets		16,634		-
Total derivative assets		$	39,389	$	8,192
Derivative liabilities:
Commodity contracts	Current derivative liabilities	$	20,682	$	69,375
Commodity contracts	Non-current derivative liabilities		31,424		95,256
Total derivative liabilities		$	52,106	$	164,631

The following tables summarize the effects of commodity derivatives instruments on the consolidated statements of income for the three and nine months ended September 30, 2011 and 2010 (in thousands):

		Gain (Loss) Reclassified from OCI into Income (Effective Portion)
ASC 815 Cash Flow		Nine Months Ended September 30,
Hedging Relationships	Income Statement Classification	2011		2010
Commodity contracts	Gain on hedging activities	$	7,326	$	19,641
		Three Months Ended September 30,
			2011		2010
Commodity contracts	Gain on hedging activities	$	1,871	$	4,383

13

		(Gain) Loss Recognized in Income
Not Designated as		Nine Months Ended September 30,
ASC 815 Hedges	Income Statement Classification	2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(100,439	)	$	(46,654	)
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,632	)		-
Total		$	(118,071	)	$	(46,654	)

		Three Months Ended September 30,
		2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(121,734	)	$	31,765
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,158	)		-
Total		$	(138,892	)	$	31,765

Contingent Features in Derivative Instruments.  None of the Company’s derivative instruments contain credit-risk-related contingent features.  Counterparties to the Company’s commodity contracts are high credit-quality financial institutions that are current or former lenders under Whiting’s credit agreement.  At the time Whiting enters into derivative contracts, the Company uses only credit agreement participants to hedge with, since these institutions are secured equally with the holders of Whiting’s bank debt, which eliminates the potential need to post collateral when Whiting is in a large derivative liability position.  As a result, the Company is not required to post letters of credit or corporate guarantees for its derivative counterparties in order to secure contract performance obligations.

6.           FAIR VALUE MEASURMENTS

The Company follows FASB ASC Topic 820, Fair Value Measurement and Disclosure, which establishes a three-level valuation hierarchy for disclosure of fair value measurements.  The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement.  The three levels are defined as follows:

· Level 1:  Quoted Prices in Active Markets for Identical Assets – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

· Level 2:  Significant Other Observable Inputs – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

· Level 3:  Significant Unobservable Inputs – inputs to the valuation methodology are unobservable and significant to the fair value measurement.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.  The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.  The Company reflects transfers between the three levels at the beginning of the reporting period in which the availability of observable inputs no longer justifies classification in the original level.

14

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values (in thousands):

	Level 1		Level 2		Level 3		Total Fair Value September 30, 2011
Financial Assets
Commodity derivatives - current	$	-	$	19,956	$	-	$	19,956
Embedded commodity derivatives - current		-		998		-		998
Commodity derivatives - non-current		-		1,801		-		1,801
Embedded commodity derivatives - non-current		-		1,539		15,095		16,634
Total financial assets	$	-	$	24,294	$	15,095	$	39,389
Financial Liabilities
Commodity derivatives - current	$	-	$	20,682	$	-	$	20,682
Commodity derivatives - non-current		-		31,424		-		31,424
Total financial liabilities	$	-	$	52,106	$	-	$	52,106

	Level 1		Level 2		Level 3		Total Fair Value December 31, 2010
Financial Assets
Commodity derivatives - current	$	-	$	4,231	$	-	$	4,231
Commodity derivatives - non-current		-		3,961		-		3,961
Total financial assets	$	-	$	8,192	$	-	$	8,192
Financial Liabilities
Commodity derivatives - current	$	-	$	69,375	$	-	$	69,375
Commodity derivatives - non-current		-		95,256		-		95,256
Total financial liabilities	$	-	$	164,631	$	-	$	164,631

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above:

Commodity Derivatives.  Commodity derivative instruments consist primarily of costless collars for crude oil and natural gas.  The Company’s costless collars are valued using industry-standard models, which are based on a market approach.  These models consider various assumptions, including quoted forward prices for commodities, time value and volatility factors.  These assumptions are observable in the marketplace throughout the full term of the contract, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace, and are therefore designated as Level 2 within the valuation hierarchy.  The discount rates used in the fair values of these instruments include a measure of either the Company’s or the counterparty’s nonperformance risk, as appropriate.  The Company utilizes counterparties’ valuations to assess the reasonableness of its own valuations.

Embedded Commodity Derivatives.  Embedded commodity derivatives relate to long and short-term drilling rig contracts as well as a CO2 purchase contract, which all have price adjustment clauses that are linked to changes in NYMEX crude oil prices.  Whiting has determined that the portions of these contracts linked to NYMEX oil prices are not clearly and closely related to the host drilling contracts, and the Company has therefore bifurcated these embedded pricing features from their host contracts and reflected them at fair value in its consolidated financial statements.  These embedded commodity derivatives are valued using industry-standard models, which are based on a market approach.  These models consider various assumptions, including quoted forward prices for commodities, LIBOR discount rates and either the Company’s or the counterparty’s nonperformance risk, as appropriate.

15

The assumptions used in the valuation of the drilling rig contracts are observable in the marketplace throughout the full term of the contract, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace, and the fair value measurements of the drilling rig contracts are therefore designated as Level 2 within the valuation hierarchy.

The assumptions used in the CO2 contract valuation, however, include inputs that are both observable in the marketplace as well as unobservable during the term of the contract.  With respect to forward prices for NYMEX crude oil where there is a lack of price transparency in certain future periods, such unobservable oil price inputs are significant to the CO2 contract valuation methodology, and thecontract’s fair value is therefore designated as Level 3 within the valuation hierarchy.

There were no recurring fair value measurements designated as Level 3 during the three or nine months ended September 30, 2010.  The table below presents a reconciliation of changes in the fair value of financial assets (liabilities) designated as Level 3 in the valuation hierarchy for the three and nine month periods ended September 30, 2011 (in thousands).

	Three Months Ended		Nine Months Ended
	September 30, 2011		September 30, 2011
Fair value asset (liability), beginning of period	$	-	$	-
Unrealized gains (losses) on embedded commodity derivative contracts included in earnings(1)		13,196		13,196
Transfers into (out of) Level 3(2)		1,899		1,899
Fair value asset (liability), end of period	$	15,095	$	15,095

________________

(1)   Included in commodity derivative (gain) loss, net in the consolidated statements of income.

(2)   With respect to forward prices for NYMEX crude oil where there is a lack of price transparency in certain future periods during the term of the CO2 contract, such unobservable oil price inputs became significant to the valuation methodology, and the contract’s fair value was therefore transferred from Level 2 to Level 3 within the valuation hierarchy.

Nonrecurring Fair Value Measurements.  The Company applies the provisions of the fair value measurement standard to its nonrecurring, non-financial measurements, including proved oil and gas property impairments.  The Company did not recognize any impairment write-downs associated with its long-lived assets during the 2011 or 2010 reporting periods presented.

7.           DEFERRED COMPENSATION

Production Participation Plan—The Company has a Production Participation Plan (the “Plan”) in which all employees participate.  On an annual basis, interests in oil and gas properties acquired, developed or sold during the year are allocated to the Plan as determined annually by the Compensation Committee of the Company’s Board of Directors.  Once allocated, the interests (not legally conveyed) are fixed.  Interest allocations prior to 1995 consisted of 2%-3% overriding royalty interests.  Interest allocations since 1995 have been 2%-5% of oil and gas sales less lease operating expenses and production taxes.

Payments of 100% of the year’s Plan interests to employees and the vested percentages of former employees in the year’s Plan interests are made annually in cash after year-end.  Accrued compensation expense under the Plan for the nine months ended September 30, 2011 and 2010 amounted to $27.6 million and $21.2 million, respectively, charged to general and administrative expense and $3.5 million and $2.9 million, respectively, charged to exploration expense.

Employees vest in the Plan ratably at 20% per year over a five year period.  Pursuant to the terms of the Plan, (i) employees who terminate their employment with the Company are entitled to receive their vested allocation of future Plan year payments on an annual basis; (ii) employees will become fully vested at age 62, regardless of when their interests would otherwise vest; and (iii) any forfeitures inure to the benefit of the Company.

16

The Company uses average historical prices to estimate the vested long-term Production Participation Plan liability.  At September 30, 2011, the Company used three-year average historical NYMEX prices of $78.46 for crude oil and $4.49 for natural gas to estimate this liability.  If the Company were to terminate the Plan or upon a change in control of the Company (as defined in the Plan), all employees fully vest and the Company would distribute to each Plan participant an amount, based upon the valuation method set forth in the Plan, in a lump sum payment twelve months after the date of termination or within one month after a change in control event.  Based on current strip prices at September 30, 2011, if the Company elected to terminate the Plan or if a change of control event occurred, it is estimated that the fully vested lump sum cash payment to employees would approximate $148.0 million.  This amount includes $11.0 million attributable to proved undeveloped oil and gas properties and $31.1 million relating to the short-term portion of the Plan liability, which has been accrued as a current payable to be paid in February 2012.  The ultimate sharing contribution for proved undeveloped oil and gas properties will be awarded in the year of Plan termination or change of control.  However, the Company has no intention to terminate the Plan.

The following table presents changes in the Plan’s estimated long-term liability for the nine months ended September 30, 2011 (in thousands):

Long-term Production Participation Plan liability at January 1, 2011	$	81,524
Change in liability for accretion, vesting, change in estimates and new Plan year activity		34,167
Cash payments accrued as compensation expense and reflected as a current payable		(31,107	)
Long-term Production Participation Plan liability at September 30, 2011	$	84,584

8.           SHAREHOLDERS’ EQUITY

Common Stock—In May 2011, Whiting’s stockholders approved an amendment to the Company’s Restated Certificate of Incorporation to increase the number of authorized shares of common stock from 175,000,000 shares to 300,000,000 shares.

Stock Split.  On January 26, 2011, the Company’s Board of Directors approved a two-for-one split of the Company's shares of common stock to be effected in the form of a stock dividend.  As a result of the stock split, stockholders of record on February 7, 2011 received one additional share of common stock for each share of common stock held.  The additional shares of common stock were distributed on February 22, 2011.  Concurrently with the payment of such stock dividend in February 2011, there was a transfer from additional paid-in capital to common stock of $0.1 million, which amount represents $0.001 per share (being the par value thereof) for each share of common stock so issued.  All common share and per share amounts in these consolidated financial statements and related notes for periods prior to February 2011 have been retroactively adjusted to reflect the stock split.  The common stock dividend resulted in the conversion price for Whiting’s 6.25% Convertible Perpetual Preferred Stock being adjusted from $43.4163 to $21.70815.

6.25% Convertible Perpetual Preferred Stock—In June 2009, the Company completed a public offering of 6.25% convertible perpetual preferred stock (“preferred stock”), selling 3,450,000 shares at a price of $100.00 per share.

Each holder of the preferred stock is entitled to an annual dividend of $6.25 per share to be paid quarterly in cash, common stock or a combination thereof on March 15, June 15, September 15 and December 15, when and if such dividend has been declared by Whiting’s board of directors. Each share of preferred stock has a liquidation preference of $100.00 per share plus accumulated and unpaid dividends and is convertible, at a holder’s option, into shares of Whiting’s common stock based on a conversion price of $21.70815, subject to adjustment upon the occurrence of certain events.  The preferred stock is not redeemable by the Company.  At any time on or after June 15, 2013, the Company may cause all outstanding shares of this preferred stock to be converted into shares of common stock if the closing price of our common stock equals or exceeds 120% of the then-prevailing conversion price for at least 20 trading days in a period of 30 consecutive trading days.  The holders of preferred stock have no voting rights unless dividends payable on the preferred stock are in arrears for six or more quarterly periods.

17

Induced Conversion of 6.25% Convertible Perpetual Preferred Stock.  In August 2010, Whiting commenced an offer to exchange up to 3,277,500, or 95%, of its preferred stock for the following consideration per share of preferred stock: 4.6066 shares of its common stock and a cash premium of $14.50.  The exchange offer expired in September 2010 and resulted in the Company accepting 3,277,500 shares of preferred stock in exchange for the issuance of 15,098,020 shares of common stock and a cash premium payment of $47.5 million.  Following the exchange offer, the 3,277,500 shares of preferred stock accepted in the exchange were cancelled, and a total of 172,500 shares of preferred stock remained outstanding.

9.           INCOME TAXES

Income tax expense during interim periods is based on applying an estimated annual effective income tax rate to year-to-date income, plus any significant unusual or infrequently occurring items which are recorded in the interim period.  The provision for income taxes for the nine months ended September 30, 2011 and 2010 differs from the amount that would be provided by applying the statutory U.S. federal income tax rate of 35% to pre-tax income primarily because of state income taxes and estimated permanent differences.

The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in various jurisdictions, permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year.  The accounting estimates used to compute the provision for income taxes may change as new events occur, more experience is obtained, additional information becomes known or as the tax environment changes.

10.           EARNINGS PER SHARE

The reconciliations between basic and diluted earnings per share are as follows (in thousands, except per share data):

	Three Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	206,235		$	58,532
Preferred stock dividends(2)		(269	)		(52,077	)
Net income available to common shareholders, basic	$	205,966		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Diluted Earnings Per Share(1)
Numerator:
Net income available to common shareholders, basic	$	205,966		$	6,455
Preferred stock dividends		269			-
Adjusted net income available to common shareholders, diluted	$	206,235		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Restricted stock and stock options		364			611
Convertible perpetual preferred stock		794			-
Weighted average shares outstanding, diluted		118,539			104,907
Earnings per common share, basic	$	1.75		$	0.06
Earnings per common share, diluted	$	1.74		$	0.06

________________

(1)   All share and per share amounts have been retroactively restated for the three months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2)   For the three months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

18

For the three months ended September 30, 2011, the diluted earnings per share calculation excludes the effect of 27,769 common shares for stock options that were out-of-the-money and 152,229 incremental common shares for restricted stock that did not meet its market-based vesting criteria as of September 30, 2011.  For the three months ended September 30, 2010, the diluted earnings per share calculation excludes the effect of 13,595,128 incremental common shares (which were issuable upon the conversion of perpetual preferred stock as of July 1, 2010 assumed conversion date) because their effect was anti-dilutive.

	Nine Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	428,798		$	270,460
Preferred stock dividends(2)		(808	)		(62,859	)
Net income available to common shareholders, basic	$	427,990		$	207,601
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Diluted Earnings Per Share(1)
Numerator:
Net income available to common shareholders, basic	$	427,990		$	207,601
Preferred stock dividends		808			809
Adjusted net income available to common shareholders, diluted	$	428,798		$	208,410
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Restricted stock and stock options		445			686
Convertible perpetual preferred stock		794			794
Weighted average shares outstanding, diluted		118,572			104,192
Earnings per common share, basic	$	3.65		$	2.02
Earnings per common share, diluted	$	3.62		$	2.00

________________

(1)   All share and per share amounts have been retroactively restated for the nine months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2)   For the nine months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

For the nine months ended September 30, 2011, the diluted earnings per share calculation excludes the effect of 1,260 incremental common shares for stock options that were out-of-the-money and 174,814 incremental common shares for restricted stock that did not meet its market-based vesting criteria as of September 30, 2011.  For the nine months ended September 30, 2010, the diluted earnings per share calculation excludes the effect of 14,323,762 incremental common shares (which were issuable upon the conversion of perpetual preferred stock as of January 1, 2010 assume conversion date) because their effect was anti-dilutive.

19

11.           ADOPTED AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

In December 2010, the FASB issued Accounting Standards Update No. 2010-29, Business Combinations: Disclosure of Supplementary Pro Forma Information for Business Combinations (“ASU 2010-29”), which provides amendments to FASB ASC Topic 805, Business Combinations.  The objective of ASU 2010-29 is to clarify and expand the pro forma revenue and earnings disclosure requirements for business combinations.  ASU 2010-29 was effective for fiscal years beginning after December 15, 2010.  The Company adopted ASU 2010-29 effective January 1, 2011, which did not have an impact on the Company’s consolidated financial statements.

In May 2011, the FASB issued Accounting Standards Update No. 2011-04, Fair Value Measurement: Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”), which provides amendments to FASB ASC Topic 820, Fair Value Measurement.  The objective of ASU 2011-04 is to create common fair value measurement and disclosure requirements between GAAP and International Financial Reporting Standards (“IFRS”).  The amendments clarify existing fair value measurement and disclosure requirements and make changes to particular principles or requirements for measuring or disclosing information about fair value measurements.  These amendments are not expected to have a significant impact on companies applying GAAP.  ASU 2011-04 is effective for interim and annual periods beginning after December 15, 2011.  The adoption of this standard will not have an impact on the Company’s consolidated financial statements other than additional disclosures.

In June 2011, the FASB issued Accounting Standards Update No. 2011-05, Comprehensive Income: Presentation of Comprehensive Income (“ASU 2011-05”), which provides amendments to FASB ASC Topic 220, Comprehensive Income.  The objective of ASU 2011-05 is to require an entity to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements.  ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of equity.  ASU 2011-05 is effective for interim and annual periods beginning after December 15, 2011 and should be applied retrospectively.  The adoption of this standard will not have an impact on the Company’s consolidated financial statements other than requiring the Company to present its statements of comprehensive income separately from its statements of equity, as these statements are currently presented on a combined basis.

In September 2011, the FASB issued Accounting Standards Update No. 2011-08, Intangibles – Goodwill and Other: Testing Goodwill for Impairment (“ASU 2011-08”), which provides amendments to FASB ASC Topic 350, Intangibles – Goodwill and Other.  The objective of ASU 2011-08 is to simplify how entities test goodwill for impairment.  The amendment provides an entity with the option to first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in Topic 350.  ASU 2011-08 is effective for interim and annual goodwill impairment tests performed for fiscal years beginning after December 15, 2011.  The adoption of this standard will not have an impact on the Company’s consolidated financial statements.

12.           SUBSEQUENT EVENT

In October 2011, Whiting Oil and Gas entered into an amendment to its existing credit agreement that increased the Company’s borrowing base under the facility from $1.1 billion to $1.5 billion.  All other terms of the credit agreement remain unchanged.

20

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless the context otherwise requires, the terms “Whiting,” “we,” “us,” “our” or “ours” when used in this Item refer to Whiting Petroleum Corporation, together with its consolidated subsidiaries, including Whiting Oil and Gas Corporation.  When the context requires, we refer to these entities separately.  This document contains forward-looking statements, which give our current expectations or forecasts of future events.  Please refer to “Forward-Looking Statements” at the end of this Item for an explanation of these types of statements.

Overview

We are an independent oil and gas company engaged in acquisition, development, exploitation, production and exploration activities primarily in the Permian Basin, Rocky Mountains, Mid-Continent, Gulf Coast and Michigan regions of the United States.  Prior to 2006, we generally emphasized the acquisition of properties that increased our production levels and provided upside potential through further development.  Since 2006, we have focused primarily on the development of previously acquired properties, as well as the acquisition of undeveloped acreage in prospect areas; both of which have provided us with extensive organic drilling opportunities, specifically on projects that we believe allow for repeatable successes and production growth.  We believe the combination of acquisitions, subsequent development and organic drilling provides us with a broad set of growth alternatives and allows us to direct our capital resources to what we believe to be the most advantageous investments.

As demonstrated by our recent capital expenditure programs, we are increasingly focused on a balanced exploration and development strategy, while continuing to selectively pursue acquisitions that complement our existing core properties.  We believe that our significant drilling inventory, combined with our operating experience and cost structure, provides us with meaningful organic growth opportunities.  Our growth plan is centered on the following activities:

• pursuing the development of projects that we believe will generate attractive rates of return;

• maintaining a balanced portfolio of lower risk, long-lived oil and gas properties that provide stable cash flows;

• seeking property and acreage acquisitions that complement our core areas; and

• allocating a portion of our capital budget to leasing and exploring prospect areas.

We have historically acquired operated and non-operated properties that exceed our rate of return criteria.  For acquisitions of properties with additional development, exploitation and exploration potential, our focus has been on acquiring operated properties so that we can better control the timing and implementation of capital spending.  In some instances, we have been able to acquire non-operated property interests at attractive rates of return that have established a presence in a new area of interest or that have complemented our existing operations.  We intend to continue to acquire both operated and non-operated interests to the extent we believe they meet our return criteria.  In addition, our willingness to acquire non-operated properties in new geographic regions provides us with geophysical and geologic data in some cases that leads to further acquisitions in the same region, whether on an operated or non-operated basis.  We sell properties when we believe that the sales price realized will provide an above average rate of return for the property or when the property no longer matches the profile of properties we desire to own.

Our revenue, profitability and future growth rate depend on factors beyond our control, such as economic, political and regulatory developments and competition from other sources of energy.  Oil and gas prices historically have been volatile and may fluctuate widely in the future.  The following table highlights the quarterly average NYMEX price trends for crude oil and natural gas since the first quarter of 2010:

		Q1 2010		Q2 2010		Q3 2010		Q4 2010		Q1 2011		Q2 2011		Q3 2011
Crude Oil	$	78.79	$	77.99	$	76.21	$	85.18	$	94.25	$	102.55	$	89.81
Natural Gas	$	5.30	$	4.09	$	4.39	$	3.81	$	4.10	$	4.32	$	4.20

21

Lower oil and natural gas prices may not only decrease our revenues, but may also reduce the amount of oil and natural gas that we can produce economically and therefore potentially lower our reserve bookings.  A substantial or extended decline in oil or natural gas prices may result in impairments of our proved oil and gas properties and may materially and adversely affect our future business, financial condition, cash flows, results of operations, liquidity or ability to finance planned capital expenditures.  Lower oil and gas prices may also reduce the amount of our borrowing base under our credit agreement, which is determined at the discretion of the lenders and is based on the collateral value of our proved reserves that have been mortgaged to the lenders.  Alternatively, higher oil and natural gas prices may result in significant non-cash, mark-to-market losses being incurred on our commodity-based derivatives, which may in turn cause us to experience net losses.

2011 Highlights and Future Considerations

Operational Highlights -

Lewis & Clark/Pronghorn.  Our Lewis & Clark/Pronghorn prospects are located primarily in the Stark and Billings counties of North Dakota and run along the Bakken shale pinch-out in the southern Williston Basin.  In this area, the Upper Bakken shale is thermally mature, moderately over-pressured, and we believe that it has charged reservoir zones within the immediately underlying Pronghorn Sand and Three Forks formations.  Net production in the Lewis & Clark/Pronghorn prospects increased 50% from 2.6 MBOE/d in the second quarter of 2011 to 4.0 MBOE/d in the third quarter of 2011.  From July 15 through October 22, 2011, we completed 12 operated wells at Lewis & Clark/Pronghorn, bringing the total number of operated wells in these prospects to 38.  As of October 22, 2011, 11 operated wells were being completed or awaiting completion and seven operated wells were being drilled.  We currently have seven drilling rigs operating in these prospects, and we plan to have eight rigs operating by the end of 2011.  During the third quarter of 2011, we continued construction on the processing plant located south of Belfield, North Dakota, which will have an inlet capacity of 30 MMcf/d and which will primarily process production from the Pronghorn area.  We expect steady plant operation to begin in January 2012.

Hidden Bench.  Our Hidden Bench prospect in McKenzie County, North Dakota targets the Bakken and Three Forks formations.  Net production at Hidden Bench averaged 0.9 MBOE/d in the third quarter of 2011.  As of October 22, 2011, we had completed five wells in this prospect and had two operated wells awaiting completion.  We currently have two drilling rigs operating in this prospect.

Sanish.  Our Sanish field in Mountrail County, North Dakota targets the Bakken and Three Forks formations.  Net production in the Sanish field increased 17% from 20.5 MBOE/d in the second quarter of 2011 to 24.1 MBOE/d in the third quarter of 2011.  During the third quarter of 2011, we completed 28 operated wells, and as of October 22, 2011, we had completed seven additional operated wells in Sanish.  We currently have 17 wells awaiting completion and eight wells being drilled in this area.  During the third quarter of 2011, we had three full-time dedicated fracture stimulation crews working in the Williston Basin and reduced our inventory of operated wells awaiting completion in the area.  In anticipation of winter weather delays, we plan to add a fourth fracture stimulation crew before the end of 2011.

Sanish production was limited during the third quarter of 2011 due to the large number of shut-in wells in this field.  We recently increased the number of service units in the Sanish field in an effort to reduce the number of wells awaiting service work by year end.

North Ward Estes.  The North Ward Estes field is located in the Ward and Winkler Counties in Texas, and we continue to have significant development and related infrastructure activity in this field since we acquired it in 2005.  Our activity at North Ward Estes to date has resulted in reserve additions and production increases, and our expansion of the CO2 flood in this area continues to generate positive results.

North Ward Estes has been responding positively to the water and CO2 floods that we initiated in May 2007.  In the third quarter of 2011, production from North Ward Estes averaged 8.4 MBOE/d representing a 4% increase from 8.1 MBOE/d in the second quarter 2011.  During June 2011, we experienced under-deliveries of CO2 contract quantities from our North Ward Estes CO2 supplier.  However, during July and August 2011 our daily CO2 deliveries increased, and since September 1, 2011, we have been receiving our full contract quantities of 134 MMcf of CO2 per day.  We are currently injecting approximately 290 MMcf/d of CO2 into the field, over half of which is recycled.

22

Postle.  The Postle field is located in Texas County, Oklahoma and produces from the Morrow sandstone.  Postle averaged 8.0 MBOE/d in the third quarter of 2011, which represents a 1% decrease from 8.1 MBOE/d in the second quarter of 2011 primarily due to normal oil and gas production decline at this field.  We are currently injecting approximately 120 MMcf/d of CO2 into the field.

Redtail.  Our Redtail prospect in Weld County, Colorado targets the Niobrara formation.  Based on recent well results, we plan to begin a second round of drilling in this area during the fourth quarter of 2011.

Acquisition and Divestiture Highlights.On February 15, 2011, we completed the acquisition of 6,000 net undeveloped acres and additional working interests in the Pronghorn field in Billings and Stark Counties, North Dakota, for an aggregate purchase price of $40.0 million.

On July 28, 2011, we completed the acquisition of approximately 23,400 net acres and one well in the Missouri Breaks prospect in Richland County, Montana for an unadjusted purchase price of $46.9 million.

On September 29, 2011, we sold our interest in several non-core oil and gas producing properties located in the Karnes, Live Oak and DeWitt counties of Texas for total cash proceeds of $64.8 million, resulting in a pre-tax gain on sale of $12.3 million.  We used the net proceeds from the property sale to repay a portion of the debt outstanding under our credit agreement.

Financing Highlights.  On January 26, 2011, our Board of Directors approved a two-for-one split of the Company's shares of common stock to be effected in the form of a stock dividend.  As a result of the stock split, stockholders of record on February 7, 2011 received one additional share of common stock for each share of common stock held.  The additional shares of common stock were distributed on February 22, 2011.  All common share and per share amounts in this Quarterly Report on Form 10-Q for periods prior to February 2011 have been retroactively adjusted to reflect the stock split.

In May 2011, our stockholders approved an amendment to the Company’s Restated Certificate of Incorporation to increase the number of authorized shares of common stock from 175,000,000 shares to 300,000,000 shares.

In October 2011, we entered into an amendment to our existing credit agreement that increased our borrowing base under the facility from $1.1 billion to $1.5 billion.  All other terms of the credit agreement remain unchanged.

23

Results of Operations

Nine Months Ended September 30, 2011 Compared to Nine Months Ended September 30, 2010

Selected Operating Data:	Nine Months Ended September 30,
	2011			2010
Net production:
Oil (MMBbls)		14.9			14.0
Natural gas (Bcf)		20.1			20.1
Total production (MMBOE)		18.3			17.3
Net sales (in millions):
Oil (1)	$	1,268.0		$	967.7
Natural gas (1)		100.1			101.3
Total oil and natural gas sales	$	1,368.1		$	1,069.0
Average sales prices:
Oil (per Bbl)	$	84.95		$	69.10
Effect of oil hedges on average price (per Bbl)		(1.77	)		(1.19	)
Oil net of hedging (per Bbl)	$	83.18		$	67.91
Average NYMEX price (per Bbl)	$	95.52		$	77.65
Natural gas (per Mcf)	$	4.98		$	5.05
Effect of natural gas hedges on average price (per Mcf)		0.03			0.03
Natural gas net of hedging (per Mcf)	$	5.01		$	5.08
Average NYMEX price (per Mcf)	$	4.21		$	4.59
Costs and expenses (per BOE):
Lease operating expenses	$	12.20		$	11.39
Production taxes	$	5.49		$	4.46
Depreciation, depletion and amortization expense	$	18.65		$	16.71
General and administrative expenses	$	3.42		$	2.80

________________

(1)  Before consideration of hedging transactions.

Oil and Natural Gas Sales.  Our oil and natural gas sales revenue increased $299.2 million to $1,368.1 million for the first nine months of 2011 compared to the same period in 2010.  Sales are a function of oil and gas volumes sold and average commodity prices realized.  Our oil sales volumes increased 7% between periods, while our natural gas sales volumes remained constant between periods.  The oil volume increase resulted primarily from drilling successes at our Lewis & Clark field, Sanish and Parshall fields, as well as increased production attributable to our CO2 project at North Ward Estes field.  Oil production from our Lewis & Clark field in the first nine months of 2011 increased 620 MBbl compared to the first nine months of 2010, while oil production from the Sanish and Parshall fields increased 280 MBbl, and oil production in our North Ward Estes field increased 185 MBbl over the same prior year period.  These production increases were partially offset by a decrease in oil production volumes of 315 MBbl at the Postle field primarily due to normal oil and gas production decline at this field.  Gas production at our Flat Rock field in the first nine months of 2011 increased 1,900 MMcf due to new wells drilled and completed in that area during the last twelve months.  This gas volume increase between periods, however, was almost entirely offset by normal field production decline across many of our areas.

Also contributing to the increase in oil and gas sales revenue in 2011 was an increase in the average sales price realized for oil.  Our average price for oil before the effects of hedging increased 23% between periods.  This increase was partially offset by a 1% decrease in our average price for natural gas before the effects of hedging.

24

Gain on Hedging Activities.  Our gain on hedging activities decreased $12.3 million in 2011 as compared to the first nine months of 2010, and it consisted of the following (in thousands):

	Nine Months Ended September 30,
	2011		2010
Gains reclassified from AOCI on de-designated hedges	$	7,326	$	19,641

Effective April 1, 2009, we elected to de-designate all of our commodity derivative contracts that had been previously designated as cash flow hedges, and we elected to discontinue all hedge accounting prospectively.  Accordingly, each period we reclassify from accumulated other comprehensive income (“AOCI”) into earnings unrealized gains (which were frozen in AOCI on the April 1, 2009 de-designation date) upon the expiration of these de-designated crude oil hedges, and we report such non-cash unrealized gains as gain on hedging activities.

See Item 3, “Qualitative and Quantitative Disclosures About Market Risk” for a list of our outstanding oil and natural gas derivatives as of October 21, 2011.

Lease Operating Expenses.  Our lease operating expenses (“LOE”) during the first nine months of 2011 were $222.9 million, a $25.4 million increase over the same period in 2010.  This rise in LOE in 2011 was related to a higher level of workover activity, as well as a $10.5 million increase in the cost of oil field goods and services associated with net wells we added during the last twelve months.  Workovers increased to $63.3 million in the first nine months of 2011, as compared to $48.4 million in the first nine months of 2010, primarily due to a higher number of well workovers being conducted on our two main CO2 projects.

Our lease operating expenses on a BOE basis also increased to $12.20 during the first nine months of 2011 from $11.39 during the first nine months of 2010.  This increase on a BOE basis was mainly due to the higher amount of workover activity in 2011, as discussed above.

Production Taxes.  Our production taxes during the first nine months of 2011 were $100.4 million, a $23.1 million increase over the same period in 2010, which increase was primarily due to higher oil and natural gas sales between periods.  However, our production taxes are generally calculated as a percentage of oil and natural gas sales revenue before the effects of hedging, and we take advantage of credits and exemptions allowed in our various taxing jurisdictions.  As a percentage of oil and gas sales before the effects of hedging, our company-wide production tax rates for the first nine months of 2011 and 2010 remained relatively constant at 7.3% and 7.2%, respectively.

Depreciation, Depletion and Amortization.  Our depreciation, depletion and amortization (“DD&A”) expense increased $51.0 million in 2011 as compared to the first nine months of 2010.  The components of our DD&A expense were as follows (in thousands):

	Nine Months Ended September 30,
	2011		2010
Depletion	$	333,010	$	282,844
Depreciation		1,910		1,571
Accretion of asset retirement obligations		5,948		5,421
Total	$	340,868	$	289,836

DD&A increased in the first nine months of 2011 primarily due to $50.2 million in higher depletion expense between periods.  This increase was the result of $33.3 million in higher depletion due to an increase in our depletion rate between periods and $16.9 million in higher depletion due to a rise in overall production volumes during the first nine months of 2011.  On a BOE basis, our DD&A rate of $18.65 for the first nine months of 2011 was 12% higher than the rate of $16.71 for the same period in 2010.  The higher DD&A rate was mainly due to $1,337.2 million in drilling and development expenditures during the past twelve months, which was partially offset by reserve additions during this same time period.

25

Exploration and Impairment Costs.  Our exploration and impairment costs increased $23.4 million in the first nine months of 2011, as compared to the first nine months of 2010.  The components of our exploration and impairment costs were as follows (in thousands):

	Nine Months Ended September 30,
	2011		2010
Exploration	$	36,406	$	25,861
Impairment		24,920		12,054
Total	$	61,326	$	37,915

Exploration costs increased $10.5 million during the first nine months of 2011 as compared to the same period in 2010 primarily due to an increase in geology related general and administrative expenses, an increase in geological and geophysical (“G&G”) activity and higher exploratory dry hole costs.  Geology related general and administrative expenses increased $4.8 million between periods.  G&G costs, such as seismic studies, amounted to $15.3 million during the first nine months of 2011 as compared to $12.0 million during the same period in 2010.  During the nine months ended September 30, 2011, we drilled three exploratory dry holes in the Rocky Mountains, Permian Basin and Gulf Coast regions totaling $4.7 million, while we drilled one exploratory dry hole in the Gulf Coast region totaling $2.8 million during the first nine months of 2010.  Impairment expense in the first nine months of 2011 and 2010 primarily related to the amortization of leasehold costs associated with individually insignificant unproved properties.  A higher amount of undeveloped leasehold costs were amortized to impairment on a group basis for the nine months ended September 30, 2011 as compared to the first nine months of 2010.

General and Administrative Expenses.  We report general and administrative expenses net of third party reimbursements and internal allocations.  The components of our general and administrative expenses were as follows (in thousands):

	Nine Months Ended September 30,
	2011			2010
General and administrative expenses	$	112,444		$	88,372
Reimbursements and allocations		(49,974	)		(39,856	)
General and administrative expense, net	$	62,470		$	48,516

General and administrative expenses before reimbursements and allocations increased $24.1 million during the first nine months of 2011 as compared to the same period in 2010 primarily due to higher employee compensation and an increase in accrued Production Participation Plan (“Plan”) distributions.  Employee compensation increased $17.7 million between periods due to personnel hired during the past twelve months, general pay increases and higher stock compensation between periods.  Accrued distributions under the Plan increased $7.1 million when comparing the first nine months of 2011 to the same period in 2010.  The increase in reimbursements and allocations in the first nine months of 2011 was primarily caused by higher salary costs and a greater number of field workers on operated properties.  Our general and administrative expenses as a percentage of oil and natural gas sales remained constant at 5% for the first nine months of 2010 and 2011.

26

Interest Expense.  The components of our interest expense were as follows (in thousands):

	Nine Months Ended September 30,
	2011			2010
Senior Subordinated Notes	$	30,188		$	31,972
Credit agreement		11,619			6,704
Amortization of debt issue costs and debt discount		6,357			8,525
Other		101			142
Capitalized interest		(2,398	)		(1,440	)
Total	$	45,867		$	45,903

Interest expense remained relatively constant between periods.  Interest expense on our credit agreement increased $4.9 million between periods due to higher borrowings outstanding under our credit agreement during the first nine months of 2011.  This increase was offset by lower amortization of debt issuance costs and debt discounts of $2.2 million and lower interest of $1.8 million on our Senior Subordinated Notes.  These decreases resulted from redeeming $150.0 million of 7.25% notes and $220.0 million of 7.25% notes in early September 2010.  Also in September 2010, we subsequently issued $350.0 million of 6.5% notes due 2018.  Our weighted average debt outstanding during the first nine months of 2011 was $1,087.4 million versus $721.4 million for the first nine months of 2010.  Our weighted average effective cash interest rate was 5.1% during the first nine months of 2011 compared to 7.2% during the first nine months of 2010.

Commodity Derivative (Gain) Loss, Net.  All of our commodity derivative contracts as well as our embedded derivatives are marked-to-market each quarter with fair value gains and losses recognized immediately in earnings, as commodity derivative (gain) loss, net.  Cash flow is only impacted to the extent that actual cash settlements under these contracts result in making or receiving a payment from the counterparty.  Cash settlement gains and losses on derivative contracts that are not embedded derivatives are also recorded immediately to earnings as commodity derivative (gain) loss, net, and its components were as follows (in thousands):

	Nine Months Ended September 30,
	2011			2010
Change in unrealized (gains) losses on derivative contracts	$	(143,721	)	$	(62,571	)
Realized cash settlement losses		25,650			15,917
Total	$	(118,071	)	$	(46,654	)

With respect to our open derivative contracts at September 30, 2011 and 2010, the futures curve of forecasted commodity prices (“forward price curve”) for crude oil generally exceeded the forward price curves that were in effect when the majority of these contracts were entered into, resulting in a net fair value liability position at the end of each respective period.  The change in unrealized (gains) losses on derivative contracts in the first nine months of 2011 resulted in a $143.7 million gain on such net liability position due to the significant downward shift in the forward price curve for NYMEX crude oil from January 1 to September 30, 2011.  The change in unrealized (gains) losses on derivative contracts in the first nine months of 2010 resulted in a $62.6 million gain due to a less significant downward shift in the same forward price curve from January 1 to September 30, 2010.

Income Tax Expense.  Income tax expense totaled $253.3 million for the first nine months of 2011, as compared to $165.9 million of income tax for the first nine months of 2010.  However, our effective income tax rate decreased to 37.1% for the first nine months of 2011 as compared to a rate of 38.0% for the same period in 2010.  This change in our effective income tax rate was primarily attributable to recent North Dakota corporate tax legislation, which created a one-time benefit in the first nine months of 2011.  Our effective tax rates for the periods ended September 30, 2011 and 2010 differ from the U.S. statutory income tax rate primarily due to the effects of state income taxes and permanent taxable differences.

27

Three Months Ended September 30, 2011 Compared to Three Months Ended September 30, 2010

Selected Operating Data:	Three Months Ended September 30,
	2011			2010
Net production:
Oil (MMBbls)		5.4			4.9
Natural gas (Bcf)		6.8			6.9
Total production (MMBOE)		6.5			6.1
Net sales (in millions):
Oil (1)	$	434.6		$	330.8
Natural gas (1)		34.0			34.4
Total oil and natural gas sales	$	468.6		$	365.2
Average sales prices:
Oil (per Bbl)	$	80.96		$	67.02
Effect of oil hedges on average price (per Bbl)		(0.35	)		(0.92	)
Oil net of hedging (per Bbl)	$	80.61		$	66.10
Average NYMEX price (per Bbl)	$	89.81		$	76.21
Natural gas (per Mcf)	$	5.00		$	5.00
Effect of natural gas hedges on average price (per Mcf)		0.02			0.02
Natural gas net of hedging (per Mcf)	$	5.02		$	5.02
Average NYMEX price (per Mcf)	$	4.20		$	4.39
Costs and expenses (per BOE):
Lease operating expenses	$	11.94		$	11.34
Production taxes	$	5.31		$	4.31
Depreciation, depletion and amortization expense	$	18.90		$	16.06
General and administrative expenses	$	3.56		$	3.20

________________

(1)  Before consideration of hedging transactions.

Oil and Natural Gas Sales. Our oil and natural gas sales revenue increased $103.3 million to $468.6 million in the third quarter of 2011 compared to the same period in 2010.  Sales are a function of oil and gas volumes sold and average commodity prices realized.  Our oil sales volumes increased 9%, while our natural gas sales volumes remained relatively constant between periods.  The oil volume increase resulted primarily from drilling successes at our Lewis & Clark field where oil production increased 310 MBbl compared to the third quarter of 2010 and at our Hidden Bench prospect where oil production volume increased 75 MBbl.  In addition, we experienced oil production volume increases of 90 MBbl at our CO2 project in the North Ward Estes field.  These production increases were partially offset by a decrease in oil production volumes of 120 MBbl at the Postle field primarily due to normal oil and gas production decline at this field.  The gas volume decrease of 1% between periods was primarily the result of normal field production decline across many of our areas.  These production decreases were largely offset by increased gas production of 515 MMcf at our Flat Rock field due to new wells drilled and completed in that area during the last twelve months.

Also contributing to the increase in oil and gas sales revenue in 2011 was an increase in the average sales price for oil.  Our average price for oil before the effects of hedging increased 21% between periods, while our average price for natural gas before the effects of hedging remained constant between periods.

28

Gain on Hedging Activities.  Our gain on hedging activities decreased $2.5 million in 2011 as compared to the third quarter of 2010, and it consisted of the following (in thousands):

	Three Months Ended September 30,
	2011		2010
Gains reclassified from AOCI on de-designated hedges	$	1,871	$	4,383

Effective April 1, 2009, we elected to de-designate all of our commodity derivative contracts that had been previously designated as cash flow hedges, and we elected to discontinue all hedge accounting prospectively.  Accordingly, each period we reclassify from AOCI into earnings unrealized gains (which were frozen in AOCI on the April 1, 2009 de-designation date) upon the expiration of these de-designated crude oil hedges, and we report such non-cash unrealized gains as gain on hedging activities.

See Item 3, “Qualitative and Quantitative Disclosures About Market Risk” for a list of our outstanding oil and natural gas derivatives as of October 21, 2011.

Lease Operating Expenses.  Our lease operating expenses during the third quarter of 2011 were $77.6 million, an $8.6 million increase over the same period in 2010.  This rise in LOE in the third quarter of 2011 was primarily related to a higher level of workover activity, as well as a $3.9 million increase in the cost of oil field goods and services associated with net wells we added during the last twelve months.  Workovers increased to $22.1 million in the third quarter of 2011, as compared to $17.4 million during the same period in 2010, primarily due to a higher number of well workovers being conducted on our two main CO2 projects.

Our lease operating expenses on a BOE basis also increased to $11.94 during the third quarter of 2011 from $11.34 during the third quarter of 2010.  This increase on a BOE basis was mainly due to the higher amount of workover activity in 2011, as discussed above.

Production Taxes.  Our production taxes during the third quarter of 2011 were $34.5 million, an $8.3 million increase over the same period in 2010, which increase was primarily due to higher oil and natural gas sales between periods.  However, our production taxes are generally calculated as a percentage of oil and natural gas sales revenue before the effects of hedging, and we take advantage of credits and exemptions allowed in our various taxing jurisdictions.  As a percentage of oil and gas sales before the effects of hedging, our company-wide production tax rates for the third quarter of 2011 and 2010 were 7.4% and 7.2%, respectively.

Depreciation, Depletion and Amortization.  Our depreciation, depletion and amortization expense increased $25.2 million in 2011 as compared to the third quarter of 2010.  The components of our DD&A expense were as follows (in thousands):

	Three Months Ended September 30,
	2011		2010
Depletion	$	120,178	$	95,276
Depreciation		706		565
Accretion of asset retirement obligations		2,006		1,863
Total	$	122,890	$	97,704

DD&A increased in the third quarter of 2011 primarily due to $24.9 million in higher depletion expense between periods.  This increase was the result of $17.2 million in higher depletion due to an increase in our depletion rate between periods and $7.7 million in higher depletion expense due to an increase in overall production volumes when comparing production in the third quarter 2011 to third quarter 2010.  On a BOE basis, our DD&A rate of $18.90 for the third quarter of 2011 was 18% higher than the rate of $16.06 for the same period in 2010.  The higher DD&A rate was mainly due to $1,337.2 million in drilling and development expenditures during the past twelve months, which was partially offset by reserve additions during this same time period.

29

Exploration and Impairment Costs.  Our exploration and impairment costs increased $8.4 million in the third quarter of 2011, as compared to the third quarter of 2010.  The components of our exploration and impairment costs were as follows (in thousands):

	Three Months Ended September 30,
	2011		2010
Exploration	$	9,440	$	6,145
Impairment		9,478		4,355
Total	$	18,918	$	10,500

Exploration costs increased $3.3 million during the third quarter of 2011 as compared to the same period in 2010 primarily due to an increase in geology related general and administrative expenses and an increase in G&G activity.  Geology related general and administrative expenses increased $2.0 million between periods.  G&G costs, such as seismic studies, amounted to $3.3 million during the third quarter of 2011 and $2.3 million during the same period in 2010.Impairment expense in the third quarter of 2011 and 2010 primarily related to the amortization of leasehold costs associated with individually insignificant unproved properties.  A higher amount of undeveloped leasehold costs were amortized to impairment on a group basis during the third quarter of 2011 as compared to the third quarter of 2010.

General and Administrative Expenses.  We report general and administrative expenses net of third party reimbursements and internal allocations.  The components of our general and administrative expenses were as follows (in thousands):

	Three Months Ended September 30,
	2011			2010
General and administrative expenses	$	41,010		$	32,980
Reimbursements and allocations		(17,866	)		(13,500	)
General and administrative expense, net	$	23,144		$	19,480

General and administrative expenses before reimbursements and allocations increased $8.0 million during the third quarter of 2011 as compared to the same period in 2010 primarily due to higher employee compensation and an increase in accrued Plan distributions.  Employee compensation increased $5.8 million in the third quarter of 2011 as compared to the third quarter of 2010 due to personnel hired during the past twelve months, general pay increases and higher stock compensation costs.  Accrued distributions under the Plan increased $3.7 million between periods.  The increase in reimbursements and allocations in the third quarter of 2011 was primarily caused by higher salary costs and a greater number of field workers on operated properties.  Our general and administrative expenses as a percentage of oil and natural gas sales remained constant at 5% for the third quarters of 2010 and 2011.

30

Interest Expense.  The components of our interest expense were as follows (in thousands):

	Three Months Ended September 30,
	2011			2010
Senior Subordinated Notes	$	10,063		$	9,810
Credit agreement		4,631			2,596
Amortization of debt issue costs and debt discount		2,115			2,801
Other		46			29
Capitalized interest		(725	)		(657	)
Total	$	16,130		$	14,579

The increase in interest expense of $1.6 million between periods was mainly due to higher borrowings outstanding under our credit agreement during the third quarter of 2011, which increased interest expense on our credit agreement by $2.0 million.  Our weighted average debt outstanding during the third quarter of 2011 was $1,220.1 million versus $674.7 million for the third quarter of 2010.  Our weighted average effective cash interest rate was 4.8% during the third quarter of 2011 compared to 7.4% during the third quarter of 2010.

Commodity Derivative (Gain) Loss, Net.  All of our commodity derivative contracts as well as our embedded derivatives are marked-to-market each quarter with fair value gains and losses recognized immediately in earnings, as commodity derivative gain (loss) net.  Cash flow is only impacted to the extent that actual cash settlements under these contracts result in making or receiving a payment from the counterparty.  Cash settlement gains and losses on derivative contracts that are not embedded derivatives are also recorded immediately to earnings as commodity derivative (gain) loss, net, and its components were as follows (in thousands):

	Three Months Ended September 30,
	2011			2010
Change in unrealized (gains) losses on derivative contracts	$	(140,606	)	$	27,407
Realized cash settlement losses		1,714			4,358
Total	$	(138,892	)	$	31,765

With respect to our open derivative contracts at September 30, 2011 and 2010, the futures curve of forecasted commodity prices (“forward price curve”) for crude oil generally exceeded the forward price curves that were in effect when the majority of these contracts were entered into, resulting in a net fair value liability position at the end of each respective period.  The change in unrealized (gains) losses on derivative contracts in the third quarter of 2011 resulted in a $140.6 million gain in such net liability position due to the significant downward shift in the forward price curve for NYMEX crude oil from July 1 to September 30, 2011.  The change in unrealized (gains) losses on derivative contracts in the third quarter of 2010 resulted in a $27.4 million loss due to an upward shift in the same forward price curve from July 1 to September 30, 2010.

Income Tax Expense.  Income tax expense totaled $126.1 million for the third quarter of 2011, as compared to $35.9 million of income tax for the third quarter of 2010.  However, our effective income tax rate remained constant at 38.0% for the third quarters of 2011 and 2010.  Our effective tax rates for the periods ended September 30, 2011 and 2010 differ from the U.S. statutory income tax rate primarily due to the effects of state income taxes and permanent taxable differences.

31

Liquidity and Capital Resources

Overview.  At September 30, 2011, our debt to total capitalization ratio was 28.9%, we had $6.1 million in cash on hand and $2,964.1 million of equity.  At December 31, 2010, our debt to total capitalization ratio was 24.0%, we had $19.0 million of cash on hand and $2,531.3 million of equity.  In the first nine months of 2011, we generated $863.8 million of cash provided by operating activities, an increase of $143.5 million over the same period in 2010.  Cash provided by operating activities increased primarily due to higher average sales prices for crude oil as well as higher crude oil production volumes.  These positive factors were partially offset by lower average sales prices for natural gas in the first nine months of 2011, as well as increased lease operating expenses, production taxes, G&G costs and general and administrative expenses during the first nine months of 2011 as compared to the same period in 2010.  Cash flows from operating activities, net borrowings under our credit agreement totaling $400.0 million and proceeds from the sale of properties of $69.2 million were used to finance $1,077.6 million of drilling and development expenditures, $233.5 million of cash acquisition capital expenditures paid in the first nine months of 2011 and the issuance of a $25.0 million note receivable.  The following chart details our exploration, development and undeveloped acreage expenditures incurred by region during the first nine months of 2011 (in thousands):

	Drilling and Development Expenditures (1)			Undeveloped Leasehold Expenditures		Exploration Expenditures		Total Expenditures			% of Total
Rocky Mountains	$	782,625		$	161,095	$	16,252	$	959,972			73	%
Permian Basin		231,070			18,330		16,295		265,695			20	%
Mid-Continent		70,688			-		1,848		72,536			5	%
Gulf Coast		7,139			25		1,947		9,111			1	%
Michigan		9,106			229		64		9,399			1	%
Total incurred		1,100,628			179,679		36,406		1,316,713			100	%
Increase in accrued capital expenditures		(27,737	)		-		-		(27,737	)
Total paid	$	1,072,891		$	179,679	$	36,406	$	1,288,976

________________

 (1)  For purposes of this schedule, exploratory dry hole costs of $4.7 million are excluded from drilling and development expenditures as reported on the statement of cash flows and instead have been included in exploration expenditures above.

We continually evaluate our capital needs and compare them to our capital resources.  Our current 2011 capital budget is $1,700.0 million.  This represents a 74% increase from the $978.3 million incurred on exploration, development and acreage expenditures during 2010.  We expect to fund our 2011 capital budget with net cash provided by our operating activities as well as with borrowings under our credit facility.  We have increased our 2011 capital budget from our actual level of 2010 expenditures in response to higher oil prices experienced in 2010 and continuing into the first nine months of 2011, higher crude oil production volumes projected for 2011, our development of projects expected to generate attractive rates of return, and additional purchases of undeveloped acreage anticipated in 2011.  Although we have only budgeted $216.5 million for acreage acquisitions in 2011, we will continue to selectively pursue property acquisitions that complement our existing core property base.  We believe that should additional attractive acquisition opportunities arise or exploration and development expenditures exceed $1,700.0 million, we will be able to finance additional capital expenditures with cash on hand, cash flows from operating activities, borrowings under our credit agreement, issuances of additional debt or equity securities, or agreements with industry partners.  Our level of exploration, development and acreage expenditures is largely discretionary, and the amount of funds devoted to any particular activity may increase or decrease significantly depending on available opportunities, commodity prices, cash flows and development results, among other factors.  We believe that we have sufficient liquidity and capital resources to execute our business plans over the next 12 months and for the foreseeable future.  In addition, with our expected cash flow streams, commodity price hedging strategies, current liquidity levels, access to debt and equity markets and flexibility to modify future capital expenditure programs, we expect to be able to fund all planned capital programs and debt repayments; comply with our debt covenants; and meet other obligations that may arise from our oil and gas operations.

32

Credit Agreement.  Whiting Oil and Gas Corporation (“Whiting Oil and Gas”), our wholly-owned subsidiary, has a credit agreement with a syndicate of banks that as of September 30, 2011 had a borrowing base of $1.1 billion with $498.6 million of available borrowing capacity, which was net of $600.0 million in borrowings and $1.4 million in letters of credit outstanding.  In October 2011, Whiting Oil and Gas entered into an amendment to its credit agreement that increased the borrowing base under the facility from $1.1 billion to $1.5 billion.

The borrowing base under the credit agreement is determined at the discretion of the lenders, based on the collateral value of our proved reserves that have been mortgaged to the lenders, and is subject to regular redeterminations on May 1 and November 1 of each year, as well as special redeterminations described in the credit agreement, in each case which may reduce the amount of the borrowing base.  A portion of the revolving credit facility in an aggregate amount not to exceed $50.0 million may be used to issue letters of credit for the account of Whiting Oil and Gas or other designated subsidiaries of ours.  As of September 30, 2011, $48.6 million was available for additional letters of credit under the agreement.

The credit agreement provides for interest only payments until April 2016, when the entire amount borrowed is due.  Interest accrues at our option at either (i) a base rate for a base rate loan plus the margin in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% or an adjusted LIBOR rate plus 1.00%, or (ii) an adjusted LIBOR rate for a Eurodollar loan plus the margin in the table below.  Additionally, we also incur commitment fees as set forth in the table below on the unused portion of the lesser of the aggregate commitments of the lenders or the borrowing base.

Ratio of Outstanding Borrowings to Borrowing Base	Applicable Margin for Base Rate Loans	Applicable Margin for Eurodollar Loans	Commitment Fee
Less than 0.25 to 1.0	0.50%	1.50%	0.375%
Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0	0.75%	1.75%	0.375%
Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0	1.00%	2.00%	0.50%
Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0	1.25%	2.25%	0.50%
Greater than or equal to 0.90 to 1.0	1.50%	2.50%	0.50%

The credit agreement contains restrictive covenants that may limit our ability to, among other things, incur additional indebtedness, sell assets, make loans to others, make investments, enter into mergers, enter into hedging contracts, incur liens and engage in certain other transactions without the prior consent of our lenders.  Except for limited exceptions, which include the payment of dividends on our 6.25% convertible perpetual preferred stock, the credit agreement also restricts our ability to make any dividend payments or distributions on our common stock.  These restrictions apply to all of the net assets of the subsidiaries.  The credit agreement requires us, as of the last day of any quarter, (i) to not exceed a total debt to the last four quarters’ EBITDAX ratio (as defined in the credit agreement) of 4.25 to 1.0 for quarters ending prior to and on December 31, 2012 and 4.0 to 1.0 for quarters ending March 31, 2013 and thereafter and (ii) to have a consolidated current assets to consolidated current liabilities ratio (as defined in the credit agreement and which includes an add back of the available borrowing capacity under the credit agreement) of not less than 1.0 to 1.0.  We were in compliance with our covenants under the credit agreement as of September 30, 2011.

For further information on the interest rates and loan security related to our credit agreement, refer to the Long-Term Debt footnote in the Notes to Consolidated Financial Statements.

Senior Subordinated Notes.  In September 2010, we issued at par $350.0 million of 6.5% Senior Subordinated Notes due October 2018.  In October 2005, we issued at par $250.0 million of 7% Senior Subordinated Notes due February 2014.

33

The indentures governing the notes restrict us from incurring additional indebtedness, subject to certain exceptions, unless our fixed charge coverage ratio (as defined in the indentures) is at least 2.0 to 1.  If we were in violation of this covenant, then we may not be able to incur additional indebtedness, including under Whiting Oil and Gas Corporation’s credit agreement.  Additionally, the indentures governing the notes contain restrictive covenants that may limit our ability to, among other things, pay cash dividends, redeem or repurchase our capital stock or our subordinated debt, make investments or issue preferred stock, sell assets, consolidate, merge or transfer all or substantially all of the assets of ours and our restricted subsidiaries taken as a whole and enter into hedging contracts.  These covenants may potentially limit the discretion of our management in certain respects.  We were in compliance with these covenants as of September 30, 2011.  However, a substantial or extended decline in oil or natural gas prices may adversely affect our ability to comply with these covenants in the future.

Schedule of Contractual Obligations.  The table below does not include our Production Participation Plan liability of $115.7 million (which amount comprises both the long and short-term portions of this obligation) as of September 30, 2011, since we cannot determine with accuracy the timing or amounts of future payments.  The following table summarizes our obligations and commitments as of September 30, 2011 to make future payments under certain contracts, aggregated by category of contractual obligation, for specified time periods (in thousands):

	Payments due by period
Contractual Obligations	Total		Less than 1 year		1-3 years		3-5 years		More than 5 years
Long-term debt (a)	$	1,200,000	$	-	$	250,000	$	600,000	$	350,000
Cash interest expense on debt (b)		264,532		54,438		97,209		67,385		45,500
Derivative contract liability fair value (c)		52,106		20,682		31,424		-		-
Asset retirement obligation (d)		87,225		4,383		9,427		7,468		65,947
Tax sharing liability (e)		24,023		1,786		3,187		19,050		-
Purchasing obligations (f)		755,192		42,468		120,733		218,357		373,634
Drilling rig contracts (g)		289,200		91,148		173,509		24,543		-
Operating leases (h)		9,240		4,069		4,527		644		-
Total	$	2,681,518	$	218,974	$	690,016	$	937,447	$	835,081

________________

(a) Long-term debt consists of the 7% Senior Subordinated Notes due 2014, the 6.5% Senior Subordinated Notes due 2018 and the outstanding borrowings under our credit agreement due in 2016, and assumes no principal repayment until the due date of the instruments.

(b) Cash interest expense on the 7% Senior Subordinated Notes due 2014 and the 6.5% Senior Subordinated Notes due 2018 is estimated assuming no principal repayment until the due date of the instruments.  Cash interest expense on the credit agreement is estimated assuming no principal repayment until the 2016 instrument due date and is estimated at a fixed interest rate of 2.4%.

(c) The above derivative obligation at September 30, 2011 consists of a $45.7 million fair value liability for derivative contracts we have entered into on our own behalf, primarily in the form of costless collars, to hedge our exposure to crude oil price fluctuations.  With respect to our open derivative contracts at September 30, 2011 with certain counterparties, the forward price curve for crude oil generally exceeded the price curve that was in effect when these contracts were entered into, resulting in a derivative fair value liability.  If current market prices are higher than a collar’s price ceiling when the cash settlement amount is calculated, we are required to pay the contract counterparties.  The ultimate settlement amounts under our derivative contracts are unknown, however, as they are subject to continuing market risk and commodity price volatility.  The above derivative obligation at September 30, 2011 also consists of a $6.4 million payable to Whiting USA Trust I (the “Trust”) for derivative contracts that we have entered into but have in turn conveyed to the Trust.  Although these derivatives are in a fair value asset position at quarter end, 75.8% of such derivative assets are due to the Trust under the terms of the conveyance.

(d) Asset retirement obligations represent the present value of estimated amounts expected to be incurred in the future to plug and abandon oil and gas wells, remediate oil and gas properties and dismantle their related facilities.

(e) Amounts shown represent the present value of estimated payments due to Alliant Energy based on projected future income tax benefits attributable to an increase in our tax bases.  As a result of the Tax Separation and Indemnification Agreement signed with Alliant Energy, the increased tax bases are expected to result in increased future income tax deductions and, accordingly, may reduce income taxes otherwise payable by us.  Under this agreement, we have agreed to pay Alliant Energy 90% of the future tax benefits we realize annually as a result of this step up in tax basis for the years ending on or prior to December 31, 2013.  In 2014, we will be obligated to pay Alliant Energy the present value of the remaining tax benefits assuming all such tax benefits will be realized in future years.

34

(f) We have four take-or-pay purchase agreements, two agreements expiring in December 2014, one agreement expiring in December 2017 and one agreement expiring in December 2029, whereby we have committed to buy certain volumes of CO2 for use in enhanced recovery projects in our Postle field in Oklahoma and our North Ward Estes field in Texas.  The purchase agreements are with three different suppliers.  Under the terms of the agreements, we are obligated to purchase a minimum daily volume of CO2 (as calculated on an annual basis) or else pay for any deficiencies at the price in effect when the minimum delivery was to have occurred.  In addition, we have two ship-or-pay agreements with two different parties, one expiring in June 2013 and one expiring in December 2017, whereby we have committed to transport a minimum daily volume of CO2 via certain pipelines or else pay for any deficiencies at a price stipulated in the contract.  The CO2 volumes planned for use in the enhanced recovery projects in the Postle and North Ward Estes fields currently exceed the minimum daily volumes specified in these agreements.  Therefore, we expect to avoid any payments for deficiencies.  The purchasing obligations reported above represent our minimum financial commitment pursuant to the terms of these contracts.  However, our actual expenditures under these contracts are expected to exceed the minimum commitments presented above.

(g) We currently have 14 drilling rigs under long-term contract, of which two drilling rigs expire in 2012, three in 2013, six in 2014 and three in 2015.  All of these rigs are operating in the Rocky Mountains region.  As of September 30, 2011, early termination of the remaining contracts would require termination penalties of $219.9 million, which would be in lieu of paying the remaining drilling commitments of $289.2 million.  No other drilling rigs working for us are currently under long-term contracts or contracts that cannot be terminated at the end of the well that is currently being drilled.  Due to the short-term and indeterminate nature of the time remaining on rigs drilling on a well-by-well basis, such obligations have not been included in this table.

(h) We lease 135,026 square feet of administrative office space in Denver, Colorado under an operating lease arrangement expiring in 2013, 46,700 square feet of office space in Midland, Texas expiring in 2012 and 20,000 square feet of office space in Dickinson, North Dakota expiring in 2016.

Based on current oil and natural gas prices and anticipated levels of production, we believe that the estimated net cash generated from operations, together with cash on hand and amounts available under our credit agreement, will be adequate to meet future liquidity needs, including satisfying our financial obligations and funding our operations and exploration and development activities.

New Accounting Pronouncements

For further information on the effects of recently adopted accounting pronouncements and the potential effects of new accounting pronouncements, refer to the Adopted and Recently Issued Accounting Pronouncements footnote in the Notes to Consolidated Financial Statements.

Critical Accounting Policies and Estimates

Information regarding critical accounting policies and estimates is contained in Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2010.

Effects of Inflation and Pricing

During the first quarter of 2010, we began to experience moderate cost increases, as the demand for oil field products and services had begun to rise from 2009 levels.  These price increases continued through the remainder of 2010 and during the first nine months of 2011.  The oil and gas industry is very cyclical and the demand for goods and services of oil field companies, suppliers and others associated with the industry put extreme pressure on the economic stability and pricing structure within the industry.  Typically, as prices for oil and natural gas increase, so do all associated costs.  Conversely, in a period of declining prices, associated cost declines are likely to lag and not adjust downward in proportion to prices.  Material changes in prices also impact the current revenue stream, estimates of future reserves, borrowing base calculations of bank loans, depletion expense, impairment assessments of oil and gas properties, and values of properties in purchase and sale transactions.  Material changes in prices can impact the value of oil and gas companies and their ability to raise capital, borrow money and retain personnel.  While we do not currently expect business costs to materially increase, higher prices for oil and natural gas could result in increases in the costs of materials, services and personnel.

35

Forward-Looking Statements

This report contains statements that we believe to be “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.  All statements other than historical facts, including, without limitation, statements regarding our future financial position, business strategy, projected revenues, earnings, costs, capital expenditures and debt levels, and plans and objectives of management for future operations, are forward-looking statements.  When used in this report, words such as we “expect,” “intend,” “plan,” “estimate,” “anticipate,” “believe” or “should” or the negative thereof or variations thereon or similar terminology are generally intended to identify forward-looking statements.  Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements.

These risks and uncertainties include, but are not limited to:  declines in oil or natural gas prices; impacts of the global recession and tight credit markets; our level of success in exploitation, exploration, development and production activities; adverse weather conditions that may negatively impact development or production activities; the timing of our exploration and development expenditures, including our ability to obtain CO2; inaccuracies of our reserve estimates or our assumptions underlying them; revisions to reserve estimates as a result of changes in commodity prices; risks related to our level of indebtedness and periodic redeterminations of the borrowing base under our credit agreement; our ability to generate sufficient cash flows from operations to meet the internally funded portion of our capital expenditures budget; our ability to obtain external capital to finance exploration and development operations and acquisitions; federal and state initiatives relating to the regulation of hydraulic fracturing; the potential impact of federal debt reduction initiatives and tax reform legislation being considered by the U.S. Federal government that could have a negative effect on the oil and gas industry; our ability to identify and complete acquisitions and to successfully integrate acquired businesses; unforeseen underperformance of or liabilities associated with acquired properties; our ability to successfully complete potential asset dispositions; the impacts of hedging on our results of operations; failure of our properties to yield oil or gas in commercially viable quantities; uninsured or underinsured losses resulting from our oil and gas operations; our inability to access oil and gas markets due to market conditions or operational impediments; the impact and costs of compliance with laws and regulations governing our oil and gas operations; our ability to replace our oil and natural gas reserves; any loss of our senior management or technical personnel; competition in the oil and gas industry in the regions in which we operate; risks arising out of our hedging transactions; and other risks described under the caption “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2010.  We assume no obligation, and disclaim any duty, to update the forward-looking statements in this report.

36

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Commodity Price Risk

Our quantitative and qualitative disclosures about market risk for changes in commodity prices and interest rates are included in Item 7A of our Annual Report on Form 10-K for the fiscal year ended December 31, 2010 and have not materially changed since that report was filed.

Commodity Derivative Contracts—Our outstanding hedges as of October 21, 2011 are summarized below:

Whiting Petroleum Corporation

Commodity	Period	Monthly Volume (Bbl)	Weighted Average NYMEX Floor/Ceiling
Crude Oil	10/2011 to 12/2011	895,000	$60.87/$97.87
Crude Oil	01/2012 to 03/2012	750,000	$61.76/$105.06
Crude Oil	04/2012 to 06/2012	750,000	$61.76/$105.06
Crude Oil	07/2012 to 09/2012	750,000	$61.76/$105.06
Crude Oil	10/2012 to 12/2012	750,000	$61.76/$105.06
Crude Oil	01/2013 to 03/2013	290,000	$47.67/$90.21
Crude Oil	04/2013 to 06/2013	290,000	$47.67/$90.21
Crude Oil	07/2013 to 09/2013	290,000	$47.67/$90.21
Crude Oil	10/2013	290,000	$47.67/$90.21
Crude Oil	11/2013	190,000	$47.22/$85.06

In connection with our conveyance on April 30, 2008 of a term net profits interest to Whiting USA Trust I (the “Trust”), the rights to any future hedge payments we make or receive on certain of our derivative contracts, representing 549 MBbls of crude oil and 2,015 MMcf of natural gas from 2011 through 2012, have been conveyed to the Trust, and therefore such payments will be included in the Trust’s calculation of net proceeds.  Under the terms of the aforementioned conveyance, we retain 10% of the net proceeds from the underlying properties.  Our retention of 10% of these net proceeds combined with our ownership of 2,186,389 Trust units, results in third-party public holders of Trust units receiving 75.8%, while we retain 24.2%, of future economic results of such hedges.  No additional hedges are allowed to be placed on Trust assets.

The table below summarizes all of the costless collars that we entered into and then in turn conveyed, as described in the preceding paragraph, to Whiting USA Trust I (of which we retain 24.2% of the future economic results and third-party public holders of Trust units receive 75.8% of the future economic results):

Conveyed to Whiting USA Trust I

Commodity	Period	Monthly Volume (Bbl)/(MMBtu)	Weighted Average NYMEX Floor/Ceiling
Crude Oil	10/2011 to 12/2011	38,242	$74.00/$140.75
Crude Oil	01/2012 to 03/2012	37,412	$74.00/$141.27
Crude Oil	04/2012 to 06/2012	36,572	$74.00/$141.73
Crude Oil	07/2012 to 09/2012	35,742	$74.00/$141.70
Crude Oil	10/2012 to 12/2012	35,028	$74.00/$142.21
Natural Gas	10/2011 to 12/2011	142,787	$7.00/$14.25
Natural Gas	01/2012 to 03/2012	137,940	$7.00/$15.55
Natural Gas	04/2012 to 06/2012	134,203	$6.00/$13.60
Natural Gas	07/2012 to 09/2012	130,173	$6.00/$14.45
Natural Gas	10/2012 to 12/2012	126,613	$7.00/$13.40

37

The collared hedges shown above have the effect of providing a protective floor while allowing us to share in upward pricing movements.  Consequently, while these hedges are designed to decrease our exposure to price decreases, they also have the effect of limiting the benefit of price increases above the ceiling.  For the crude oil hedges outstanding as of September 30, 2011, a hypothetical $10.00 per Bbl change in the NYMEX forward curve as of September 30, 2011 applied to the notional amounts would cause a change in our commodity derivative (gain) loss of $67.7 million.  For the natural gas hedges outstanding as of September 30, 2011, a hypothetical $1.00 per Mcf change in the NYMEX forward curve as of September 30, 2011 applied to the notional amounts would cause a change in our commodity derivative (gain) loss of $0.4 million.

We have various fixed price gas sales contracts with end users for a portion of the natural gas we produce in Colorado, Michigan and Utah.  Our estimated future production volumes to be sold under these fixed price contracts as of October 21, 2011 are summarized below:

Commodity	Period	Monthly Volume (MMBtu)	Weighted Average Price Per MMBtu
Natural Gas	10/2011 to 12/2011	772,460	$5.30
Natural Gas	01/2012 to 03/2012	577,127	$5.30
Natural Gas	04/2012 to 06/2012	461,460	$5.41
Natural Gas	07/2012 to 09/2012	465,794	$5.41
Natural Gas	10/2012 to 12/2012	398,667	$5.46
Natural Gas	01/2013 to 03/2013	360,000	$5.47
Natural Gas	04/2013 to 06/2013	364,000	$5.47
Natural Gas	07/2013 to 09/2013	368,000	$5.47
Natural Gas	10/2013 to 12/2013	368,000	$5.47
Natural Gas	01/2014 to 03/2014	330,000	$5.49
Natural Gas	04/2014 to 06/2014	333,667	$5.49
Natural Gas	07/2014 to 09/2014	337,333	$5.49
Natural Gas	10/2014 to 12/2014	337,333	$5.49

Embedded Commodity Derivative Contracts—The price we pay for oil field products and services significantly impacts our profitability, reserve estimates, access to capital and future growth rate.  Typically, as prices for oil and natural gas increase, so do all associated costs.  We have entered into certain contracts for oil field goods and services with price adjustment clauses that are linked to changes in NYMEX crude oil prices to reduce our exposure to paying higher than the market rates for these goods and services in a climate of declining oil prices.  We have determined that the portions of these contracts linked to NYMEX oil prices are not clearly and closely related to the host contracts, and we have therefore bifurcated these embedded pricing features from their host contracts and reflected them at fair value in the consolidated financial statements.  These embedded commodity derivative contracts have not been designated as hedges, and therefore all changes in fair value since inception have been recorded immediately to earnings.

As of September 30, 2011, we had four contracts with drilling rig companies, whereby the rig day rates increased or decreased along with changes in the price of NYMEX crude oil.  These drilling rig contracts have various termination dates ranging from November 2011 to September 2014.  For these embedded commodity derivative contracts, a hypothetical $10.00 per Bbl increase in the NYMEX forward curve as of September 30, 2011 would cause a decrease in our commodity derivative gain of $1.7 million, whereas a hypothetical $10.00 per Bbl decrease in the NYMEX forward curve would cause an increase in our commodity derivative gain of $1.5 million.

In May 2011, we entered into a long-term contract to purchase CO2 from 2015 through 2029 for use in our enhanced oil recovery project at our North Ward Estes field in Texas.  The price per Mcf of CO2 purchased under this agreement increases or decreases as the average price of NYMEX crude oil likewise increases or decreases.  For this embedded commodity derivative contract, a hypothetical $10.00 per Bbl change in the NYMEX forward curve as of September 30, 2011 would cause a change in our commodity derivative (gain) loss of $12.7 million.

38

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures.  In accordance with Rule 13a-15(b) of the Securities Exchange Act of 1934 (the “Exchange Act”), our management evaluated, with the participation of our Chairman and Chief Executive Officer and our Chief Financial Officer, the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of September 30, 2011.  Based upon their evaluation of these disclosures controls and procedures, the Chairman and Chief Executive Officer and the Chief Financial Officer concluded that the disclosure controls and procedures were effective as of September 30, 2011 to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission, and to ensure that information required to be disclosed by us in the reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting.  There was no change in our internal control over financial reporting that occurred during the quarter ended September 30, 2011 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

39

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

Whiting is subject to litigation claims and governmental and regulatory proceedings arising in the ordinary course of business.  We believe that all claims and litigation we are involved in are not likely to have a material adverse effect on our consolidated financial position, cash flows or results of operations.

Whiting received a complaint, dated September 28, 2011, in an administrative action by the United States Environmental Protection Agency (“EPA”) alleging that Whiting violated the Safe Drinking Water Act by reporting inaccurate wellhead injection pressure data to the EPA for one water injection well in North Dakota.  The complaint requests that Whiting pay a civil penalty of $151,250.   Whiting is currently negotiating a resolution of the complaint with the EPA and expects to complete the process before the end of 2011.

Item 1A. Risk Factors

Risk factors relating to us are contained in Item 1A of our Annual Report on Form 10-K for the fiscal year ended December 31, 2010.  No material change to such risk factors has occurred during the nine months ended September 30, 2011.

Item 6. Exhibits

The exhibits listed in the accompanying index to exhibits are filed as part of this Quarterly Report on Form 10-Q.

40

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized, on this 3rd day of November, 2011.

	WHITING PETROLEUM CORPORATION
By	/s/ James J. Volker
	James J. Volker
	Chairman and Chief Executive Officer
By	/s/ Michael J. Stevens
	Michael J. Stevens
	Vice President and Chief Financial Officer
By	/s/ Brent P. Jensen
	Brent P. Jensen
	Controller and Treasurer

41

EXHIBIT INDEX

Exhibit Number	Exhibit Description
(4.1)	Second Amendment to Fifth Amended and Restated Credit Agreement, dated as of October 12, 2011, among Whiting Petroleum Corporation, Whiting Oil and Gas Corporation, JPMorgan Chase Bank, N.A., as Administrative Agent, the various other agents party thereto and the lenders party thereto [Incorporated by reference to Exhibit 4 to Whiting Petroleum Corporation’s Current Report on Form 8-K dated October 12, 2011 (File No. 001-31899)].
(31.1)	Certification by the Chairman and Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act.
(31.2)	Certification by the Vice President and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act.
(32.1)	Written Statement of the Chairman and Chief Executive Officer pursuant to 18 U.S.C. Section 1350.
(32.2)	Written Statement of the Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350.
(101)	The following materials from Whiting Petroleum Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011 are furnished herewith, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets as of September 30, 2011 and December 31, 2010, (ii) the Consolidated Statements of Income for the Three and Nine Months Ended September 30, 2011 and 2010, (iii) the Consolidated Statements of Cash Flow for the Nine Months Ended September 30, 2011 and 2010, (iv) the Consolidated Statements of Equity and Comprehensive Income for the Nine Months Ended September 30, 2011 and 2010, and (v) Notes to Consolidated Financial Statements.

42

EX-31.1

Exhibit 31.1

CERTIFICATIONS

I, James J. Volker, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Whiting Petroleum Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a 15(f) and 15d (f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2011

/s/ James J. Volker

James J. Volker

Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATIONS

I, Michael J. Stevens, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Whiting Petroleum Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a 15(f) and 15d (f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 3, 2011

/s/ Michael J. Stevens

Michael J. Stevens

Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

WRITTEN STATEMENT OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

Solely for the purposes of complying with 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, I, the undersigned Chairman, President and Chief Executive Officer of Whiting Petroleum Corporation, a Delaware corporation (the “Company”), hereby certify, based on my knowledge, that the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2011 (the “Report”) fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ James J. Volker

James J. Volker

Chairman and Chief Executive Officer

Date: November 3, 2011

EX-32.2

Exhibit 32.2

WRITTEN STATEMENT OF THE CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

Solely for the purposes of complying with 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, I, the undersigned Vice President and Chief Financial Officer of Whiting Petroleum Corporation, a Delaware corporation (the “Company”), hereby certify, based on my knowledge, that the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2011 (the “Report”) fully complies with the requirements of Section 13(a) of the Securities Exchange Act of 1934 and that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Michael J. Stevens

Michael J. Stevens

Vice President and Chief Financial Officer

Date: November 3, 2011

XML

Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
6.25% convertible perpetual preferred stock, shares issued	172,400	172,500
6.25% convertible perpetual preferred stock, shares outstanding	172,400	172,500
6.25% convertible perpetual preferred stock, aggregate liquidation preference	$ 17,240,000	$ 17,250,000
Convertible perpetual preferred stock	6.25%	6.25%
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	118,109,058	117,967,876
Common stock, shares outstanding	117,380,843	117,098,506

XML

Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
REVENUES AND OTHER INCOME:
Oil and natural gas sales	$ 468,573		$ 365,239		$ 1,368,121		$ 1,068,961
Gain on hedging activities	1,871		4,383		7,326		19,641
Amortization of deferred gain on sale	3,518		3,854		10,455		11,613
Gain on sale of properties	13,505				14,732		1,918
Interest income and other	90		258		351		498
Total revenues and other income	487,557		373,734		1,400,985		1,102,631
COSTS AND EXPENSES:
Lease operating	77,630		69,001		222,937		197,586
Production taxes	34,510		26,193		100,412		77,341
Depreciation, depletion and amortization	122,890		97,704		340,868		289,836
Exploration and impairment	18,918		10,500		61,326		37,915
General and administrative	23,144		19,480		62,470		48,516
Interest expense	16,130		14,579		45,867		45,903
Loss on early extinguishment of debt			6,235				6,235
Change in Production Participation Plan liability	853		3,858		3,060		9,550
Commodity derivative (gain) loss, net	(138,892)		31,765		(118,071)		(46,654)
Total costs and expenses	155,183		279,315		718,869		666,228
INCOME BEFORE INCOME TAXES	332,374		94,419		682,116		436,403
INCOME TAX EXPENSE (BENEFIT):
Current	975		(170)		4,590		6,468
Deferred	125,164		36,057		248,728		159,475
Total income tax expense (benefit)	126,139		35,887		253,318		165,943
NET INCOME	206,235		58,532		428,798		270,460
Preferred stock dividends	(269)		(52,920)		(808)		(63,701)
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 205,966		$ 5,612		$ 427,990		$ 206,759
EARNINGS PER COMMON SHARE:
Basic	$ 1.75	[1]	$ 0.06	[1]	$ 3.65	[1]	$ 2.02	[1]
Diluted	$ 1.74	[1]	$ 0.06	[1]	$ 3.62	[1]	$ 2.00	[1]
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic	117,381	[1]	104,296	[1]	117,333	[1]	102,712	[1]
Diluted	118,539	[1]	104,907	[1]	118,572	[1]	104,192	[1]

[1] All share and per share amounts have been retroactively restated for the 2010 periods to reflect the Company's two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.

XML

Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

Derivative [Line Items]

Location and fair value of derivative instruments

		Fair Value
Not Designated as ASC 815 Hedges	Balance Sheet Classification	September 30, 2011		December 31, 2010
Derivative assets:
Commodity contracts	Prepaid expenses and other	$	19,956	$	4,231
Embedded commodity contracts	Prepaid expenses and other		998		—
Commodity contracts	Other long-term assets		1,801		3,961
Embedded commodity contracts	Other long-term assets		16,634		—
Total derivative assets		$	39,389	$	8,192
Derivative liabilities:
Commodity contracts	Current derivative liabilities	$	20,682	$	69,375
Commodity contracts	Non-current derivative liabilities		31,424		95,256
Total derivative liabilities		$	52,106	$	164,631

(Gain) Loss Recognized in Income

		Gain (Loss) Reclassified from OCI into Income (Effective  Portion)
ASC 815 Cash Flow		Nine Months Ended September 30,
Hedging Relationships	Income Statement Classification	2011		2010
Commodity contracts	Gain on hedging activities	$	7,326	$	19,641
		Three Months Ended September 30,
		2011		2010
Commodity contracts	Gain on hedging activities	$	1,871	$	4,383

		(Gain) Loss Recognized in Income
Not Designated as		Nine Months Ended September 30,
ASC 815 Hedges	Income Statement Classification	2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(100,439	)	$	(46,654	)
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,632	)		—
Total		$	(118,071	)	$	(46,654	)

		Three Months Ended September 30,
		2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(121,734	)	$	31,765
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,158	)		—
Total		$	(138,892	)	$	31,765

Whiting Petroleum Corporation [Member]

Derivative [Line Items]

Derivative instruments

	Whiting Petroleum Corporation
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)		Natural  Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		2,712,764		103,663	$61.00 - $98.31	$7.00 - $14.25
Jan – Dec 2012		9,105,091		384,002	$61.93 - $105.48	$6.50 - $14.27
Jan – Nov 2013		3,090,000		—	$47.64 - $89.90	n/a
Total		14,907,855		487,665

Whiting USA Trust I [Member]

Derivative [Line Items]

Derivative instruments

	Whiting Petroleum Corporation
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude  Oil (Bbl)		Natural  Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		27,764		103,663	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012		105,091		384,002	$74.00 - $141.72	$6.50 - $14.27
Total		132,855		487,665

Third-party Public Holders of Trust Units [Member]

Derivative [Line Items]

Derivative instruments

	Third-party Public Holders of Trust Units
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)		Natural Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		86,962		324,698	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012		329,171		1,202,784	$74.00 - $141.72	$6.50 - $14.27
Total		416,133		1,527,482

XML

Document and Entity Information (USD $)	9 Months Ended
	Sep. 30, 2011	Oct. 15, 2011	Jun. 30, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	WHITING PETROLEUM CORP
Entity Central Index Key	0001255474
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 4,012,157,212
Entity Common Stock, Shares Outstanding		117,380,843

XML

Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Reconciliations between basic and diluted earnings per share

	Three Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	206,235		$	58,532
Preferred stock dividends (2)		(269	)		(52,077	)
Net income available to common shareholders, basic	$	205,966		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Diluted Earnings Per Share (1)
Numerator:
Net income available to common shareholders, basic	$	205,966		$	6,455
Preferred stock dividends		269			—
Adjusted net income available to common shareholders, diluted	$	206,235		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Restricted stock and stock options		364			611
Convertible perpetual preferred stock		794			—
Weighted average shares outstanding, diluted		118,539			104,907
Earnings per common share, basic	$	1.75		$	0.06
Earnings per common share, diluted	$	1.74		$	0.06

(1) All share and per share amounts have been retroactively restated for the three months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2) For the three months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

	Nine Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	428,798		$	270,460
Preferred stock dividends (2)		(808	)		(62,859	)
Net income available to common shareholders, basic	$	427,990		$	207,601
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Diluted Earnings Per Share (1)
Numerator:
Net income available to common shareholders, basic	$	427,990		$	207,601
Preferred stock dividends		808			809
Adjusted net income available to common shareholders, diluted	$	428,798		$	208,410
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Restricted stock and stock options		445			686
Convertible perpetual preferred stock		794			794
Weighted average shares outstanding, diluted		118,572			104,192
Earnings per common share, basic	$	3.65		$	2.02
Earnings per common share, diluted	$	3.62		$	2.00

(1) All share and per share amounts have been retroactively restated for the nine months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2) For the nine months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

XML

Derivative Financial Instruments

9 Months Ended

Sep. 30, 2011

Derivative Financial Instruments [Abstract]

DERIVATIVE FINANCIAL INSTRUMENTS

5. DERIVATIVE FINANCIAL INSTRUMENTS

The Company is exposed to certain risks relating to its ongoing business operations, and Whiting uses derivative instruments to manage its commodity price risk. Whiting follows FASB ASC Topic 815, Derivatives and Hedging, to account for its derivative financial instruments.

Commodity Derivative Contracts—Historically, prices received for crude oil and natural gas production have been volatile because of seasonal weather patterns, supply and demand factors, worldwide political factors and general economic conditions. Whiting enters into derivative contracts, primarily costless collars, to achieve a more predictable cash flow by reducing its exposure to commodity price volatility. Commodity derivative contracts are thereby used to ensure adequate cash flow to fund the Company’s capital programs and to manage returns on acquisitions and drilling programs. Costless collars are designed to establish floor and ceiling prices on anticipated future oil and gas production. While the use of these derivative instruments limits the downside risk of adverse price movements, they may also limit future revenues from favorable price movements. The Company does not enter into derivative contracts for speculative or trading purposes.

Whiting Derivatives. The table below details the Company’s costless collar derivatives, including its proportionate share of Whiting USA Trust I (the “Trust”) derivatives, entered into to hedge forecasted crude oil and natural gas production revenues, as of October 21, 2011.

	Whiting Petroleum Corporation
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)		Natural  Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		2,712,764		103,663	$61.00 - $98.31	$7.00 - $14.25
Jan – Dec 2012		9,105,091		384,002	$61.93 - $105.48	$6.50 - $14.27
Jan – Nov 2013		3,090,000		—	$47.64 - $89.90	n/a
Total		14,907,855		487,665

Derivatives Conveyed to Whiting USA Trust I. In connection with the Company’s conveyance in April 2008 of a term net profits interest to the Trust and related sale of 11,677,500 Trust units to the public, the right to any future hedge payments made or received by Whiting on certain of its derivative contracts have been conveyed to the Trust, and therefore such payments will be included in the Trust’s calculation of net proceeds. Under the terms of the aforementioned conveyance, Whiting retains 10% of the net proceeds from the underlying properties. Whiting’s retention of 10% of these net proceeds, combined with its ownership of 2,186,389 Trust units, results in third-party public holders of Trust units receiving 75.8%, and Whiting retaining 24.2%, of the future economic results of commodity derivative contracts conveyed to the Trust. The relative ownership of the future economic results of such commodity derivatives is reflected in the tables below. No additional hedges are allowed to be placed on Trust assets.

The 24.2% portion of Trust derivatives that Whiting has retained the economic rights to (and which are also included in the table above) are as follows:

	Whiting Petroleum Corporation
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude  Oil (Bbl)		Natural  Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		27,764		103,663	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012		105,091		384,002	$74.00 - $141.72	$6.50 - $14.27
Total		132,855		487,665

The 75.8% portion of Trust derivative contracts of which Whiting has transferred the economic rights to third-party public holders of Trust units (and which have not been reflected in the above tables) are as follows:

	Third-party Public Holders of Trust Units
	Contracted Volumes				Weighted Average NYMEX Price Collar Ranges
Period	Crude Oil (Bbl)		Natural Gas (Mcf)		Crude Oil (per Bbl)	Natural Gas (per Mcf)
Oct – Dec 2011		86,962		324,698	$74.00 - $140.75	$7.00 - $14.25
Jan – Dec 2012		329,171		1,202,784	$74.00 - $141.72	$6.50 - $14.27
Total		416,133		1,527,482

Discontinuance of Cash Flow Hedge Accounting—Prior to April 1, 2009, the Company designated a portion of its commodity derivative contracts as cash flow hedges, whose unrealized fair value gains and losses were recorded to other comprehensive income. Effective April 1, 2009, however, the Company elected to de-designate all of its commodity derivative contracts that had been previously designated as cash flow hedges and elected to discontinue hedge accounting prospectively. As a result, such mark-to-market values at March 31, 2009 were frozen in accumulated other comprehensive income as of the de-designation date and are being reclassified into earnings as the original hedged transactions affect income. As of September 30, 2011, accumulated other comprehensive income amounted to $1.8 million ($1.1 million net of tax), which consisted entirely of unrealized deferred gains and losses on commodity derivative contracts that had been previously designated as cash flow hedges. During the next twelve months, the Company expects to reclassify into earnings from accumulated other comprehensive income net after-tax gains of $2.3 million related to de-designated commodity hedges. Currently, the Company recognizes all gains and losses from changes in commodity derivative fair values immediately in earnings rather than deferring any such amounts in accumulated other comprehensive income.

Embedded Commodity Derivative Contracts—As of September 30, 2011, Whiting had entered into certain contracts for oil field goods or services, whereby the price adjustment clauses for such goods or services are linked to changes in NYMEX crude oil prices. The Company has determined that the portions of these contracts linked to NYMEX oil prices are not clearly and closely related to the host contracts, and the Company has therefore bifurcated these embedded pricing features from their host contracts and reflected them at fair value in the consolidated financial statements.

Drilling Rig Contracts. As of September 30, 2011, Whiting had entered into four contracts with drilling rig companies, whereby the rig day rates included price adjustment clauses that are linked to changes in NYMEX crude oil prices. These drilling rig contracts have various termination dates ranging from November 2011 to September 2014. The price adjustment formulas in the rig contracts stipulate that with every $10 increase or decrease in the price of NYMEX crude, the cost of drilling rig day rates to the Company will likewise increase or decrease by specific dollar amounts as set forth in each of the individual contracts. As of September 30, 2011, the aggregate estimated fair value of the embedded derivatives in these drilling rig contracts was an asset of $2.5 million.

As global crude oil prices increase or decrease, the demand for drilling rigs in North America similarly increases and decreases. Because the supply of onshore drilling rigs in North America is fairly inelastic, these changes in rig demand cause drilling rig day rates to increase or decrease in tandem with crude oil price fluctuations. When the Company enters into a long-term drilling rig contract that has a fixed rig day rate, which does not increase or decrease with changes in oil prices, the Company is exposed to the risk of paying higher than the market day rate for drilling rigs in a climate of declining oil prices. This in turn could have a negative impact on the Company’s oil and gas well economics. As a result, the Company reduces its exposure to this risk by entering into certain drilling contracts which have day rates that fluctuate in tandem with changes in oil prices.

CO ₂ Purchase Contract. In May 2011, Whiting entered into a long-term contract to purchase CO₂ from 2015 through 2029 for use in its enhanced oil recovery project that is being carried out at its North Ward Estes field in Texas. The price per Mcf of CO ₂ purchased under this agreement increases or decreases as the average price of NYMEX crude oil likewise increases or decreases. As of September 30, 2011, the estimated fair value of the embedded derivative in this CO₂ purchase contract was an asset of $15.1 million.

Although CO ₂ is not a commodity that is actively traded on a public exchange, the market price for CO ₂ generally fluctuates in tandem with increases or decreases in crude oil prices. When Whiting enters into a long-term CO₂ purchase contract where the price of CO₂ is fixed and does not adjust with changes in oil prices, the Company is exposed to the risk of paying higher than the market rate for CO₂ in a climate of declining oil and CO₂ prices. This in turn could have a negative impact on the project economics of the Company’s CO ₂ flood at North Ward Estes. As a result, the Company reduces its exposure to this risk by entering into certain CO ₂ purchase contracts which have prices that fluctuate along with changes in crude oil prices.

Derivative Instrument Reporting—All derivative instruments are recorded on the consolidated balance sheet at fair value, other than derivative instruments that meet the “normal purchase normal sales” exclusion. The following tables summarize the location and fair value amounts of all derivative instruments in the consolidated balance sheets (in thousands):

		Fair Value
Not Designated as ASC 815 Hedges	Balance Sheet Classification	September 30, 2011		December 31, 2010
Derivative assets:
Commodity contracts	Prepaid expenses and other	$	19,956	$	4,231
Embedded commodity contracts	Prepaid expenses and other		998		—
Commodity contracts	Other long-term assets		1,801		3,961
Embedded commodity contracts	Other long-term assets		16,634		—
Total derivative assets		$	39,389	$	8,192
Derivative liabilities:
Commodity contracts	Current derivative liabilities	$	20,682	$	69,375
Commodity contracts	Non-current derivative liabilities		31,424		95,256
Total derivative liabilities		$	52,106	$	164,631

The following tables summarize the effects of commodity derivatives instruments on the consolidated statements of income for the three and nine months ended September 30, 2011 and 2010 (in thousands):

		Gain (Loss) Reclassified from OCI into Income (Effective  Portion)
ASC 815 Cash Flow		Nine Months Ended September 30,
Hedging Relationships	Income Statement Classification	2011		2010
Commodity contracts	Gain on hedging activities	$	7,326	$	19,641
		Three Months Ended September 30,
		2011		2010
Commodity contracts	Gain on hedging activities	$	1,871	$	4,383

		(Gain) Loss Recognized in Income
Not Designated as		Nine Months Ended September 30,
ASC 815 Hedges	Income Statement Classification	2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(100,439	)	$	(46,654	)
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,632	)		—
Total		$	(118,071	)	$	(46,654	)

		Three Months Ended September 30,
		2011			2010
Commodity contracts	Commodity derivative (gain) loss, net	$	(121,734	)	$	31,765
Embedded commodity contracts	Commodity derivative (gain) loss, net		(17,158	)		—
Total		$	(138,892	)	$	31,765

Contingent Features in Derivative Instruments. None of the Company’s derivative instruments contain credit-risk-related contingent features. Counterparties to the Company’s commodity contracts are high credit-quality financial institutions that are current or former lenders under Whiting’s credit agreement. At the time Whiting enters into derivative contracts, the Company uses only credit agreement participants to hedge with, since these institutions are secured equally with the holders of Whiting’s bank debt, which eliminates the potential need to post collateral when Whiting is in a large derivative liability position. As a result, the Company is not required to post letters of credit or corporate guarantees for its derivative counterparties in order to secure contract performance obligations.

XML

Basis of Presentation (Details)	Sep. 30, 2011
Basis of Presentation (Textual) [Abstract]
Percentage of ownership in subsidiary	15.80%

XML

Income Taxes (Details)	9 Months Ended
	Sep. 30, 2011
Income Taxes (Textual) [Abstract]
Effective Income Tax rate	35.00%

XML

Fair Value Measurments (Details) (Recurring Basis [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Financial Assets
Total financial assets	$ 39,389	$ 8,192
Financial Liabilities
Total financial liabilities	52,106	164,631
Fair Value, Inputs, Level 1 [Member]
Financial Assets
Total financial assets	0	0
Financial Liabilities
Total financial liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | Commodity contracts [Member]
Financial Assets
Financial assets - current	0	0
Financial assets - non-current	0	0
Financial Liabilities
Financial liabilities - current	0	0
Financial liabilities - non-current	0	0
Fair Value, Inputs, Level 1 [Member] | Embedded commodity contracts [Member]
Financial Assets
Financial assets - current	0
Financial assets - non-current	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets
Total financial assets	24,294	8,192
Financial Liabilities
Total financial liabilities	52,106	164,631
Fair Value, Inputs, Level 2 [Member] | Commodity contracts [Member]
Financial Assets
Financial assets - current	19,956	4,231
Financial assets - non-current	1,801	3,961
Financial Liabilities
Financial liabilities - current	20,682	69,375
Financial liabilities - non-current	31,424	95,256
Fair Value, Inputs, Level 2 [Member] | Embedded commodity contracts [Member]
Financial Assets
Financial assets - current	998
Financial assets - non-current	1,539
Fair Value, Inputs, Level 3 [Member]
Financial Assets
Total financial assets	15,095	0
Financial Liabilities
Total financial liabilities	0	0
Fair Value, Inputs, Level 3 [Member] | Commodity contracts [Member]
Financial Assets
Financial assets - current	0	0
Financial assets - non-current	0	0
Financial Liabilities
Financial liabilities - current	0	0
Financial liabilities - non-current	0	0
Fair Value, Inputs, Level 3 [Member] | Embedded commodity contracts [Member]
Financial Assets
Financial assets - current	0
Financial assets - non-current	15,095
Commodity contracts [Member]
Financial Assets
Financial assets - current	19,956	4,231
Financial assets - non-current	1,801	3,961
Financial Liabilities
Financial liabilities - current	20,682	69,375
Financial liabilities - non-current	31,424	95,256
Embedded commodity contracts [Member]
Financial Assets
Financial assets - current	998
Financial assets - non-current	$ 16,634

XML

Deferred Compensation (Tables)

9 Months Ended

Sep. 30, 2011

Deferred Compensation [Abstract]

Changes in Estimated Long-Term Liability

Long-term Production Participation Plan liability at January 1, 2011	$	81,524
Change in liability for accretion, vesting, change in estimates and new Plan year activity		34,167
Cash payments accrued as compensation expense and reflected as a current payable		(31,107	)
Long-term Production Participation Plan liability at September 30, 2011	$	84,584

XML

Earnings Per Share

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

EARNINGS PER SHARE

10. EARNINGS PER SHARE

The reconciliations between basic and diluted earnings per share are as follows (in thousands, except per share data):

	Three Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	206,235		$	58,532
Preferred stock dividends (2)		(269	)		(52,077	)
Net income available to common shareholders, basic	$	205,966		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Diluted Earnings Per Share (1)
Numerator:
Net income available to common shareholders, basic	$	205,966		$	6,455
Preferred stock dividends		269			—
Adjusted net income available to common shareholders, diluted	$	206,235		$	6,455
Denominator:
Weighted average shares outstanding, basic		117,381			104,296
Restricted stock and stock options		364			611
Convertible perpetual preferred stock		794			—
Weighted average shares outstanding, diluted		118,539			104,907
Earnings per common share, basic	$	1.75		$	0.06
Earnings per common share, diluted	$	1.74		$	0.06

(1) All share and per share amounts have been retroactively restated for the three months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2) For the three months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

For the three months ended September 30, 2011, the diluted earnings per share calculation excludes the effect of 27,769 common shares for stock options that were out-of-the-money and 152,229 incremental common shares for restricted stock that did not meet its market-based vesting criteria as of September 30, 2011. For the three months ended September 30, 2010, the diluted earnings per share calculation excludes the effect of 13,595,128 incremental common shares (which were issuable upon the conversion of perpetual preferred stock as of July 1, 2010 assumed conversion date) because their effect was anti-dilutive.

	Nine Months Ended September 30,
	2011			2010
Basic Earnings Per Share(1)
Numerator:
Net income	$	428,798		$	270,460
Preferred stock dividends (2)		(808	)		(62,859	)
Net income available to common shareholders, basic	$	427,990		$	207,601
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Diluted Earnings Per Share (1)
Numerator:
Net income available to common shareholders, basic	$	427,990		$	207,601
Preferred stock dividends		808			809
Adjusted net income available to common shareholders, diluted	$	428,798		$	208,410
Denominator:
Weighted average shares outstanding, basic		117,333			102,712
Restricted stock and stock options		445			686
Convertible perpetual preferred stock		794			794
Weighted average shares outstanding, diluted		118,572			104,192
Earnings per common share, basic	$	3.65		$	2.02
Earnings per common share, diluted	$	3.62		$	2.00

(1) All share and per share amounts have been retroactively restated for the nine months ended September 30, 2010 to reflect the Company’s February 2011 two-for-one stock split described in Note 8 to these consolidated financial statements.

(2) For the nine months ended September 30, 2010, amount includes a decrease of $0.8 million for preferred stock dividends accumulated.

For the nine months ended September 30, 2011, the diluted earnings per share calculation excludes the effect of 1,260 incremental common shares that were issuable for stock options that were out-of-the-money and 174,814 incremental common shares for restricted stock units that did not meet its market-based vesting criteria as of September 30, 2011. For the nine months ended September 30, 2010, the diluted earnings per share calculation excludes the effect of 14,323,762 incremental common shares (which were issuable upon the conversion of perpetual preferred stock as of January 1, 2010 assume conversion date) because their effect was anti-dilutive.

XML

Basis of Presentation

9 Months Ended

Sep. 30, 2011

Basis of Presentation [Abstract]

BASIS OF PRESENTATION

1. BASIS OF PRESENTATION

Description of Operations—Whiting Petroleum Corporation, a Delaware corporation, is an independent oil and gas company that acquires, exploits, develops and explores for crude oil, natural gas and natural gas liquids primarily in the Permian Basin, Rocky Mountains, Mid-Continent, Gulf Coast and Michigan regions of the United States. Unless otherwise specified or the context otherwise requires, all references in these notes to “Whiting” or the “Company” are to Whiting Petroleum Corporation and its consolidated subsidiaries.

Consolidated Financial Statements—The unaudited consolidated financial statements include the accounts of Whiting Petroleum Corporation, its consolidated subsidiaries and Whiting’s pro rata share of the accounts of Whiting USA Trust I pursuant to Whiting’s 15.8% ownership interest. Investments in entities which give Whiting significant influence, but not control, over the investee are accounted for using the equity method. Under the equity method, investments are stated at cost plus the Company’s equity in undistributed earnings and losses. All intercompany balances and transactions have been eliminated upon consolidation. These financial statements have been prepared in accordance with GAAP for interim financial reporting. In the opinion of management, the accompanying financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company’s interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. Whiting’s 2010 Annual Report on Form 10-K includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in Whiting’s 2010 Annual Report on Form 10-K.

Earnings Per Share—Basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during each period. Diluted earnings per common share is calculated by dividing adjusted net income available to common shareholders by the weighted average number of diluted common shares outstanding, which includes the effect of potentially dilutive securities. Potentially dilutive securities for the diluted earnings per share calculations consist of unvested restricted stock awards and outstanding stock options using the treasury method, as well as convertible perpetual preferred stock using the if-converted method. In the computation of diluted earnings per share, excess tax benefits that would be created upon the assumed vesting of unvested restricted shares or the assumed exercise of stock options (i.e. hypothetical excess tax benefits) are included in the assumed proceeds component of the treasury share method to the extent that such excess tax benefits are more likely than not to be realized. When a loss from continuing operations exists, all potentially dilutive securities are anti-dilutive and are therefore excluded from the computation of diluted earnings per share.

XML

Derivative Financial Instruments (Details 3) (Not Designated as ASC 815 Hedges [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Derivative assets:
Total derivative assets	$ 39,389	$ 8,192
Derivative liabilities:
Total derivative liabilities	52,106	164,631
Commodity contracts [Member] | Prepaid Expenses And Other [Member]
Derivative assets:
Total derivative assets	19,956	4,231
Commodity contracts [Member] | Other Long Term Assets [Member]
Derivative assets:
Total derivative assets	1,801	3,961
Commodity contracts [Member] | Current Derivative Liabilities [Member]
Derivative liabilities:
Total derivative liabilities	20,682	69,375
Commodity contracts [Member] | Non Current Derivative Liabilities [Member]
Derivative liabilities:
Total derivative liabilities	31,424	95,256
Embedded commodity contracts [Member] | Prepaid Expenses And Other [Member]
Derivative assets:
Total derivative assets	998
Embedded commodity contracts [Member] | Other Long Term Assets [Member]
Derivative assets:
Total derivative assets	$ 16,634	$ 0

XML

Deferred Compensation

9 Months Ended

Sep. 30, 2011

Deferred Compensation [Abstract]

DEFERRED COMPENSATION

7. DEFERRED COMPENSATION

Production Participation Plan—The Company has a Production Participation Plan (the “Plan”) in which all employees participate. On an annual basis, interests in oil and gas properties acquired, developed or sold during the year are allocated to the Plan as determined annually by the Compensation Committee of the Company’s Board of Directors. Once allocated, the interests (not legally conveyed) are fixed. Interest allocations prior to 1995 consisted of 2%-3% overriding royalty interests. Interest allocations since 1995 have been 2%-5% of oil and gas sales less lease operating expenses and production taxes.

Payments of 100% of the year’s Plan interests to employees and the vested percentages of former employees in the year’s Plan interests are made annually in cash after year-end. Accrued compensation expense under the Plan for the nine months ended September 30, 2011 and 2010 amounted to $27.6 million and $21.2 million, respectively, charged to general and administrative expense and $3.5 million and $2.9 million, respectively, charged to exploration expense.

Employees vest in the Plan ratably at 20% per year over a five year period. Pursuant to the terms of the Plan, (i) employees who terminate their employment with the Company are entitled to receive their vested allocation of future Plan year payments on an annual basis; (ii) employees will become fully vested at age 62, regardless of when their interests would otherwise vest; and (iii) any forfeitures inure to the benefit of the Company.

The Company uses average historical prices to estimate the vested long-term Production Participation Plan liability. At September 30, 2011, the Company used three-year average historical NYMEX prices of $78.46 for crude oil and $4.49 for natural gas to estimate this liability. If the Company were to terminate the Plan or upon a change in control of the Company (as defined in the Plan), all employees fully vest and the Company would distribute to each Plan participant an amount, based upon the valuation method set forth in the Plan, in a lump sum payment twelve months after the date of termination or within one month after a change in control event. Based on current strip prices at September 30, 2011, if the Company elected to terminate the Plan or if a change of control event occurred, it is estimated that the fully vested lump sum cash payment to employees would approximate $148.0 million. This amount includes $11.0 million attributable to proved undeveloped oil and gas properties and $31.1 million relating to the short-term portion of the Plan liability, which has been accrued as a current payable to be paid in February 2012. The ultimate sharing contribution for proved undeveloped oil and gas properties will be awarded in the year of Plan termination or change of control. However, the Company has no intention to terminate the Plan.

The following table presents changes in the Plan’s estimated long-term liability for the nine months ended September 30, 2011 (in thousands):

Long-term Production Participation Plan liability at January 1, 2011	$	81,524
Change in liability for accretion, vesting, change in estimates and new Plan year activity		34,167
Cash payments accrued as compensation expense and reflected as a current payable		(31,107	)
Long-term Production Participation Plan liability at September 30, 2011	$	84,584

XML

Subsequent Event

9 Months Ended

Sep. 30, 2011

Subsequent Event [Abstract]

SUBSEQUENT EVENT

12. SUBSEQUENT EVENT

In October 2011, Whiting Oil and Gas entered into an amendment to its existing credit agreement that increased the Company’s borrowing base under the facility from $1.1 billion to $1.5 billion. All other terms of the credit agreement remain unchanged.

XML

Shareholders' Equity

9 Months Ended

Sep. 30, 2011

Shareholders' Equity [Abstract]

SHAREHOLDERS' EQUITY

8. SHAREHOLDERS’ EQUITY

Common Stock—In May 2011, Whiting’s stockholders approved an amendment to the Company’s Restated Certificate of Incorporation to increase the number of authorized shares of common stock from 175,000,000 shares to 300,000,000 shares.

Stock Split. On January 26, 2011, the Company’s Board of Directors approved a two-for-one split of the Company’s shares of common stock to be effected in the form of a stock dividend. As a result of the stock split, stockholders of record on February 7, 2011 received one additional share of common stock for each share of common stock held. The additional shares of common stock were distributed on February 22, 2011. Concurrently with the payment of such stock dividend in February 2011, there was a transfer from additional paid-in capital to common stock of $0.1 million, which amount represents $0.001 per share (being the par value thereof) for each share of common stock so issued. All common share and per share amounts in these consolidated financial statements and related notes for periods prior to February 2011 have been retroactively adjusted to reflect the stock split. The common stock dividend resulted in the conversion price for Whiting’s 6.25% Convertible Perpetual Preferred Stock being adjusted from $43.4163 to $21.70815.

6.25% Convertible Perpetual Preferred Stock—In June 2009, the Company completed a public offering of 6.25% convertible perpetual preferred stock (“preferred stock”), selling 3,450,000 shares at a price of $100.00 per share.

Each holder of the preferred stock is entitled to an annual dividend of $6.25 per share to be paid quarterly in cash, common stock or a combination thereof on March 15, June 15, September 15 and December 15, when and if such dividend has been declared by Whiting’s board of directors. Each share of preferred stock has a liquidation preference of $100.00 per share plus accumulated and unpaid dividends and is convertible, at a holder’s option, into shares of Whiting’s common stock based on a conversion price of $21.70815, subject to adjustment upon the occurrence of certain events. The preferred stock is not redeemable by the Company. At any time on or after June 15, 2013, the Company may cause all outstanding shares of this preferred stock to be converted into shares of common stock if the closing price of our common stock equals or exceeds 120% of the then-prevailing conversion price for at least 20 trading days in a period of 30 consecutive trading days. The holders of preferred stock have no voting rights unless dividends payable on the preferred stock are in arrears for six or more quarterly periods.

Induced Conversion of 6.25% Convertible Perpetual Preferred Stock. In August 2010, Whiting commenced an offer to exchange up to 3,277,500, or 95%, of its preferred stock for the following consideration per share of preferred stock: 4.6066 shares of its common stock and a cash premium of $14.50. The exchange offer expired in September 2010 and resulted in the Company accepting 3,277,500 shares of preferred stock in exchange for the issuance of 15,098,020 shares of common stock and a cash premium payment of $47.5 million. Following the exchange offer, the 3,277,500 shares of preferred stock accepted in the exchange were cancelled, and a total of 172,500 shares of preferred stock remained outstanding.

XML

Derivative Financial Instruments (Details) (Whiting Petroleum Corporation [Member], USD $)	Sep. 30, 2011 Barrel_of_Oil
Oct - Dec 2011 [Member] | Crude oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	2,712,764
Derivative, Floor Price	$ 61.00
Derivative, Cap Price	98.31
Oct - Dec 2011 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	103,663
Derivative, Floor Price	7.00
Derivative, Cap Price	14.25
Jan - Dec 2012 [Member] | Crude oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	9,105,091
Derivative, Floor Price	61.93
Derivative, Cap Price	105.48
Jan - Dec 2012 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	384,002
Derivative, Floor Price	6.50
Derivative, Cap Price	14.27
Jan - Nov 2013 [Member] | Crude oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	3,090,000
Derivative, Floor Price	47.64
Derivative, Cap Price	$ 89.90
Jan - Nov 2013 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	0
Crude oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	14,907,855
Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	487,665

XML

Fair Value Measurements

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

FAIR VALUE MEASUREMENTS

6. FAIR VALUE MEASUREMENTS

The Company follows FASB ASC Topic 820, Fair Value Measurement and Disclosure, which establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. The three levels are defined as follows:

• Level 1: Quoted Prices in Active Markets for Identical Assets – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

• Level 2: Significant Other Observable Inputs – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

• Level 3: Significant Unobservable Inputs – inputs to the valuation methodology are unobservable and significant to the fair value measurement.

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. The Company reflects transfers between the three levels at the beginning of the reporting period in which the availability of observable inputs no longer justifies classification in the original level.

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010, and indicates the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values (in thousands):

		$19,956		$19,956		$19,956		$19,956
	Level 1		Level 2		Level 3		Total Fair  Value September 30, 2011
Financial Assets
Commodity derivatives - current	$	—	$	19,956	$	—	$	19,956
Embedded commodity derivatives - current		—		998		—		998
Commodity derivatives - non-current		—		1,801		—		1,801
Embedded commodity derivatives - non-current		—		1,539		15,095		16,634
Total financial assets	$	—	$	24,294	$	15,095	$	39,389
Financial Liabilities
Commodity derivatives - current	$	—	$	20,682	$	—	$	20,682
Commodity derivatives - non-current		—		31,424		—		31,424
Total financial liabilities	$	—	$	52,106	$	—	$	52,106

		$164,631		$164,631		$164,631		$164,631
	Level 1		Level 2		Level 3		Total Fair  Value December 31, 2010
Financial Assets
Commodity derivatives - current	$	—	$	4,231	$	—	$	4,231
Commodity derivatives - non-current		—		3,961		—		3,961
Total financial assets	$	—	$	8,192	$	—	$	8,192
Financial Liabilities
Commodity derivatives - current	$	—	$	69,375	$	—	$	69,375
Commodity derivatives - non-current		—		95,256		—		95,256
Total financial liabilities	$	—	$	164,631	$	—	$	164,631

The following methods and assumptions were used to estimate the fair values of the assets and liabilities in the tables above:

Commodity Derivatives. Commodity derivative instruments consist primarily of costless collars for crude oil and natural gas. The Company’s costless collars are valued using industry-standard models, which are based on a market approach. These models consider various assumptions, including quoted forward prices for commodities, time value and volatility factors. These assumptions are observable in the marketplace throughout the full term of the contract, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace, and are therefore designated as Level 2 within the valuation hierarchy. The discount rates used in the fair values of these instruments include a measure of either the Company’s or the counterparty’s nonperformance risk, as appropriate. The Company utilizes counterparties’ valuations to assess the reasonableness of its own valuations.

Embedded Commodity Derivatives. Embedded commodity derivatives relate to long and short-term drilling rig contracts as well as a CO₂ purchase contract, which all have price adjustment clauses that are linked to changes in NYMEX crude oil prices. Whiting has determined that the portions of these contracts linked to NYMEX oil prices are not clearly and closely related to the host drilling contracts, and the Company has therefore bifurcated these embedded pricing features from their host contracts and reflected them at fair value in its consolidated financial statements. These embedded commodity derivatives are valued using industry-standard models, which are based on a market approach. These models consider various assumptions, including quoted forward prices for commodities, LIBOR discount rates and either the Company’s or the counterparty’s nonperformance risk, as appropriate.

The assumptions used in the valuation of the drilling rig contracts are observable in the marketplace throughout the full term of the contract, can be derived from observable data or are supported by observable levels at which transactions are executed in the marketplace, and the fair value measurements of the drilling rig contracts are therefore designated as Level 2 within the valuation hierarchy.

The assumptions used in the CO₂ contract valuation, however, include inputs that are both observable in the marketplace as well as unobservable during the term of the contract. With respect to forward prices for NYMEX crude oil where there is a lack of price transparency in certain future periods, such unobservable oil price inputs are significant to the CO₂ contract valuation methodology, and the contract’s fair value is therefore designated as Level 3 within the valuation hierarchy.

There were no recurring fair value measurements designated as Level 3 during the three or nine months ended September 30, 2010. The table below presents a reconciliation of changes in the fair value of financial assets (liabilities) designated as Level 3 in the valuation hierarchy for the three and nine month periods ended September 30, 2011 (in thousands).

	Three Months Ended September 30, 2011		Nine Months Ended September 30, 2011
Fair value asset (liability), beginning of period	$	—	$	—
Unrealized gains (losses) on embedded commodity derivative contracts included in earnings (1)		13,196		13,196
Transfers in to (out of) Level 3 (2)		1,899		1,899
Fair value asset (liability), end of period	$	15,095	$	15,095

(1) Included in commodity derivative (gain) loss, net in the consolidated statements of income.

(2) With respect to forward prices for NYMEX crude oil where there is a lack of price transparency in certain future periods during the term of the CO₂ contract, such unobservable oil price inputs became significant to the valuation methodology, and the contract’s fair value was therefore transferred from Level 2 to Level 3 within the valuation hierarchy.

Nonrecurring Fair Value Measurements. The Company applies the provisions of the fair value measurement standard to its nonrecurring, non-financial measurements, including proved oil and gas property impairments. The Company did not recognize any impairment write-downs associated with its long-lived assets during the 2011 or 2010 reporting periods presented.

XML

Consolidated Statements of Equity and Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data		Total	Preferred Stock	Common Stock		Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total Whiting Shareholders' Equity	Noncontrolling Interest	Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2009		$ 2,270,085	$ 3	$ 51	[1]	$ 1,546,635	$ 20,413	$ 702,983	$ 2,270,085
Beginning balance, shares at Dec. 31, 2009			3,450,000	102,728,000	[1]
Net income		270,460						270,460	270,460		270,460
OCI amortization on de-designated hedges, net of taxes of $7,242 & $2,702		(12,399)					(12,399)		(12,399)		(12,399)
Total comprehensive income											258,061
Induced conversion of convertible perpetual preferred stock		(47,529)	(3)	8		(5)		(47,529)	(47,529)
Conversion of preferred stock to common, Shares			(3,277,000)	15,098,000
Restricted stock issued, Shares	[1]			325,000
Restricted stock forfeited, Shares	[1]			(22,000)
Restricted stock used for tax withholdings		(5,679)				(5,679)			(5,679)
Restricted stock used for tax withholdings, Shares	[1]			(156,000)
Stock-based compensation		6,585				6,585			6,585
Preferred stock dividends paid		(16,172)						(16,172)	(16,172)
Ending balance at Sep. 30, 2010		2,465,351	0	59	[1]	1,547,536	8,014	909,742	2,465,351
Ending balance, shares at Sep. 30, 2010			173,000	117,973,000	[1]
Beginning balance at Dec. 31, 2010		2,531,315	59,000	0	[1]	1,549,822	5,768	975,666	2,531,315
Beginning balance, shares at Dec. 31, 2010			173,000	117,968,000	[1]
Net income		428,798						428,798	428,798		428,798
OCI amortization on de-designated hedges, net of taxes of $7,242 & $2,702		(4,624)					(4,624)		(4,624)		(4,624)
Total comprehensive income											424,174
Conversion of preferred stock to common, Shares			(1,000)	1,000	[1]
Two-for-one stock split				59	[1]	(59)
Contributions from noncontrolling interest		8,333								8,333
Restricted stock issued, Shares	[1]			304,000
Restricted stock forfeited, Shares	[1]			(16,000)
Restricted stock used for tax withholdings		(9,049)				(9,049)			(9,049)
Restricted stock used for tax withholdings, Shares	[1]			(148,000)
Stock-based compensation		10,086				10,086			10,086
Preferred stock dividends paid		(808)						(808)	(808)
Ending balance at Sep. 30, 2011		$ 2,964,051	$ 0	$ 118	[1]	$ 1,550,800	$ 1,144	$ 1,403,656	$ 2,955,718	$ 8,333
Ending balance, shares at Sep. 30, 2011			172,000	118,109,000	[1]

[1] All common share amounts (except par values) have been retroactively restated for all periods presented to reflect the Company's two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.

XML

Acquisitions and Divestitures

9 Months Ended

Sep. 30, 2011

Acquisitions and Divestitures [Abstract]

ACQUISITIONS AND DIVESTITURES

2. ACQUISITIONS AND DIVESTITURES

2011 Acquisitions

On July 28, 2011, the Company completed the acquisition of approximately 23,400 net acres and one well in the Missouri Breaks prospect in Richland County, Montana for an unadjusted purchase price of $46.9 million. Disclosures of pro forma revenues and net income for this acquisition are not material and have not been presented accordingly.

On March 18, 2011, Whiting and an unrelated third party formed Sustainable Water Resources, LLC (“SWR”) to develop a water project in the state of Colorado. The Company contributed $25.0 million for a 75% interest in SWR, and the 25% noncontrolling interest in SWR was ascribed a fair value of $8.3 million, which consisted of $2.5 million in cash contributions, as well as $5.8 million in intangible and fixed assets contributed to the joint venture. There were no significant results of operations attributable to the noncontrolling interest since its inception through the period ended September 30, 2011.

On February 15, 2011, the Company completed the acquisition of 6,000 net undeveloped acres and additional working interests in the Pronghorn field in Billings and Stark Counties, North Dakota, for an aggregate purchase price of $40.0 million.

2011 Divestitures

On September 29, 2011, Whiting sold its interest in several non-core oil and gas producing properties located in the Karnes, Live Oak and DeWitt counties of Texas for total cash proceeds of $64.8 million, resulting in a pre-tax gain on sale of $12.3 million. Whiting used the net proceeds from the property sale to repay a portion of the debt outstanding under its credit agreement.

2010 Acquisitions

In September 2010, Whiting acquired operated interests in 19 producing oil and gas wells, undeveloped acreage, and gathering lines, all of which are located on approximately 20,400 gross (16,100 net) acres in Weld County, Colorado. The aggregate purchase price was $19.2 million; substantially all of which was allocated to the oil and gas properties and acreage acquired. Disclosures of pro forma revenues and net income for this acquisition are not material and have not been presented accordingly.

In August 2010, Whiting acquired oil and gas leasehold interests covering approximately 112,000 gross (90,200 net) acres in the Montana portion of the Williston Basin for $26.0 million. The undeveloped acreage is located in Roosevelt and Sheridan counties.

2010 Divestitures

There were no significant divestitures during the year ended December 31, 2010.

XML

Deferred Compensation (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Changes in Estimated Long-Term Liability
Beginning long-term Production Participation Plan liability	$ 81,524
Change in Liability for accretion, vesting, change in estimates and new Plan year activity	34,167
Cash payments accrued as compensation expense and reflected as a current payable	(31,107)
Ending long-term Production Participation Plan liability	$ 84,584

XML

Asset Retirement Obligations (Details) (USD $)	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Asset retirement obligations
Asset retirement obligation at January 1, 2011	$ 83,083,000
Additional liability incurred	1,711,000
Revisions in estimated cash flows	419,000
Accretion expense	5,949,000
Obligations on sold properties	(790,000)
Liabilities settled	(3,147,000)
Asset retirement obligation at September 30, 2011	87,225,000
Asset Retirement Obligation (Textual) [Abstract]
Asset retirement obligations, current portion	$ 4,400,000	$ 6,100,000

XML

Long-Term Debt

9 Months Ended

Sep. 30, 2011

Long-Term Debt [Abstract]

LONG-TERM DEBT

3. LONG-TERM DEBT

Long-term debt consisted of the following at September 30, 2011 and December 31, 2010 (in thousands):

	September 30, 2011		December 31, 2010
Credit agreement	$	600,000	$	200,000
6.5% Senior Subordinated Notes due 2018		350,000		350,000
7% Senior Subordinated Notes due 2014		250,000		250,000
Total debt	$	1,200,000	$	800,000

Credit Agreement—Whiting Oil and Gas Corporation (“Whiting Oil and Gas”), the Company’s wholly-owned subsidiary, has a credit agreement with a syndicate of banks. As of September 30, 2011, this credit facility had a borrowing base of $1.1 billion with $498.6 million of available borrowing capacity, which is net of $600.0 million in borrowings and $1.4 million in letters of credit outstanding. The credit agreement provides for interest only payments until April 2016, when the agreement expires and all outstanding borrowings are due. In October 2011, Whiting Oil and Gas entered into an amendment to its existing credit agreement that increased the borrowing base under the facility from $1.1 billion to $1.5 billion.

The borrowing base under the credit agreement is determined at the discretion of the lenders, based on the collateral value of the Company’s proved reserves that have been mortgaged to its lenders, and is subject to regular redeterminations on May 1 and November 1 of each year, as well as special redeterminations described in the credit agreement, in each case which may reduce the amount of the borrowing base. A portion of the revolving credit facility in an aggregate amount not to exceed $50.0 million may be used to issue letters of credit for the account of Whiting Oil and Gas or other designated subsidiaries of the Company. As of September 30, 2011, $48.6 million was available for additional letters of credit under the agreement.

Interest accrues at the Company’s option at either (i) a base rate for a base rate loan plus the margin in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% or an adjusted LIBOR rate plus 1.00%, or (ii) an adjusted LIBOR rate for a Eurodollar loan plus the margin in the table below. Additionally, the Company also incurs commitment fees as set forth in the table below on the unused portion of the lesser of the aggregate commitments of the lenders or the borrowing base, and are included as a component of interest expense. At September 30, 2011, the weighted average interest rate on the outstanding principal balance under the credit agreement was 2.4%.

Ratio of Outstanding Borrowings to Borrowing Base	Applicable Margin for Base Rate Loans			Applicable Margin for Eurodollar Loans			Commitment Fee
Less than 0.25 to 1.0		0.50	%		1.50	%		0.375	%
Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0		0.75	%		1.75	%		0.375	%
Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0		1.00	%		2.00	%		0.50	%
Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0		1.25	%		2.25	%		0.50	%
Greater than or equal to 0.90 to 1.0		1.50	%		2.50	%		0.50	%

The credit agreement contains restrictive covenants that may limit the Company’s ability to, among other things, incur additional indebtedness, sell assets, make loans to others, make investments, enter into mergers, enter into hedging contracts, incur liens and engage in certain other transactions without the prior consent of its lenders. Except for limited exceptions, which include the payment of dividends on the Company’s 6.25% convertible perpetual preferred stock, the credit agreement also restricts our ability to make any dividend payments or distributions on its common stock. These restrictions apply to all of the net assets of the subsidiaries. The credit agreement requires the Company, as of the last day of any quarter, (i) to not exceed a total debt to the last four quarters’ EBITDAX ratio (as defined in the credit agreement) of 4.25 to 1.0 for quarters ending prior to and on December 31, 2012 and 4.0 to 1.0 for quarters ending March 31, 2013 and thereafter and (ii) to have a consolidated current assets to consolidated current liabilities ratio (as defined in the credit agreement and which includes an add back of the available borrowing capacity under the credit agreement) of not less than 1.0 to 1.0. The Company was in compliance with its covenants under the credit agreement as of September 30, 2011.

The obligations of Whiting Oil and Gas under the amended credit agreement are secured by a first lien on substantially all of Whiting Oil and Gas’ properties included in the borrowing base for the credit agreement. The Company has guaranteed the obligations of Whiting Oil and Gas under the credit agreement and has pledged the stock of Whiting Oil and Gas as security for its guarantee.

Senior Subordinated Notes—In October 2005, the Company issued at par $250.0 million of 7% Senior Subordinated Notes due February 2014. The estimated fair value of these notes was $266.3 million as of September 30, 2011, based on quoted market prices for these same debt securities.

Redemption of 7.25% Senior Subordinated Notes Due 2012 and 2013—In September 2010, the Company paid $383.5 million to redeem all of its $150.0 million aggregate principal amount of 7.25% Senior Subordinated Notes due 2012 and all of its $220.0 million aggregate principal amount of 7.25% Senior Subordinated Notes due 2013, which consisted of a redemption price of 100.00% for the 2012 notes and 101.8125% for the 2013 notes and included the payment of accrued and unpaid interest on such notes. The Company financed the redemption of the 2012 and 2013 notes with borrowings under its credit agreement. As a result of the redemption, Whiting recognized a $6.2 million loss on early extinguishment of debt, which consisted of a cash charge of $4.0 million related to the redemption premium on the 2013 notes and a non-cash charge of $2.2 million related to the acceleration of debt discounts and unamortized debt issuance costs.

Issuance of 6.5% Senior Subordinated Notes Due 2018—In September 2010, the Company issued at par $350.0 million of 6.5% Senior Subordinated Notes due October 2018. The Company used the net proceeds from this issuance to repay a portion of the debt, which was borrowed to redeem its 2012 and 2013 notes, outstanding under its credit agreement. The estimated fair value of these notes was $349.6 million as of September 30, 2011, based on quoted market prices for these same debt securities.

The notes are unsecured obligations of Whiting Petroleum Corporation and are subordinated to all of the Company’s senior debt, which currently consists of Whiting Oil and Gas’ credit agreement. The Company’s obligations under the 2014 notes are fully, unconditionally, jointly and severally guaranteed by the Company’s 100%-owned subsidiaries, Whiting Oil and Gas and Whiting Programs, Inc. (the “2014 Guarantors”). Additionally, the Company’s obligations under the 2018 notes are fully, unconditionally, jointly and severally guaranteed by the Company’s 100%-owned subsidiary, Whiting Oil and Gas (collectively with the 2014 Guarantors, the “Guarantors”). Any subsidiaries other than the Guarantors are minor subsidiaries as defined by Rule 3-10(h)(6) of Regulation S-X of the Securities and Exchange Commission. Whiting Petroleum Corporation has no assets or operations independent of this debt and its investments in guarantor subsidiaries.

XML

Shareholders Equity (Details) (USD $)	9 Months Ended	12 Months Ended			1 Months Ended	9 Months Ended	13 Months Ended			9 Months Ended		9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	May 31, 2011	Aug. 31, 2010	Sep. 30, 2010 Convertible perpetual preferred stock [Member]	Sep. 30, 2011 Convertible perpetual preferred stock [Member]	Aug. 31, 2011 Convertible perpetual preferred stock [Member]	Aug. 31, 2010 Convertible perpetual preferred stock [Member]	Jun. 30, 2009 Convertible perpetual preferred stock [Member]	Sep. 30, 2011 Convertible perpetual preferred stock [Member] Pre-adjustment [Member]	May 31, 2011 Pre-adjustment [Member]	Sep. 30, 2011 Additional Paid-in Capital
Additional Shareholders' Equity (Textual) [Abstract]
Number of common stock after approval to increase authorized shares	300,000,000	300,000,000	300,000,000								175,000,000
Interest rate on convertible perpetual preferred stock	6.25%	6.25%				6.25%
Common stock dividend, conversion price						$ 21.70815				$ 43.4163
6.25% convertible perpetual preferred stock, shares issued	172,400	172,500							3,450,000
6.25% convertible perpetual preferred stock, shares issue Price per share									$ 100.00
Dividend on preferred stock per share Per annum						$ 6.25
Liquidation preference per share of preferred stock						$ 100.00
All Preferred stock to be converted into shares of common stock at option of Company at any time On or after June15,2013						The Company may cause all outstanding shares of this preferred stock to be converted into shares of common stock if the closing price of our common stock equals or exceeds 120% of the then-prevailing conversion price for at least 20 trading days in a period of 30 consecutive trading days.
Preferred stock have no voting rights						The holders of preferred stock have no voting rights unless dividends payable on the preferred stock are in arrears for six or more quarterly periods.
Convertible Preferred Stock, Conversion Offer, Shares							3,277,500
Convertible Preferred Stock, Conversion Offer, Percentage of Shares Offered				95.00%
Common stock to be issued on conversion of each preferred stock								4.6066
Cash premium on conversion of each preferred stock								$ 14.50
Preferred stock accepted in the exchange cancelled					3,277,500
Number of Common Stock Issued on Conversion					15,098,020
Cash premium paid on Conversion of preferred Stock					$ 47,500,000
Preferred stock remained outstanding	172,400	172,500				172,500
Two-for-one stock split												$ (59,000)
Shareholders Equity (Textual) [Abstract]
Stock split approved	Two-for-one split of common stock to be effected in the form of a stock dividend to which stockholders of record on February 7, 2011 received one additional share of common stock for each share of common stock held.
Adjustments to additional paid in capital stock split per share	$ 0.001	$ 0.001

XML

Acquisitions and Divestitures (Details Textual) (USD $)	1 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2010 Well	Sep. 30, 2011	Sep. 29, 2011	Sep. 30, 2011 Sustainable Water Resources, LLC [Member]	Mar. 18, 2011 Sustainable Water Resources, LLC [Member]	Jul. 28, 2011 Missouri Breaks Prospect [Member] Well Acre	Feb. 15, 2011 North Dakota [Member] Acre	Sep. 30, 2010 Colorado [Member] Acre	Aug. 31, 2010 Montana [Member] Acre
Acquisitions and Divestitures (Textual) [Abstract]
Amount contributed in ownership					$ 25,000,000
Noncontrolling interest, ownership percentage by parent		15.80%			75.00%
Noncontrolling interest, ownership percentage by noncontrolling owners					25.00%
Total fair value					8,300,000
Cash contributions in fair value					2,500,000
Tangible and intangible assets contributed in fair value		5,833,000		5,800,000
Number of acquired operated Interest in of producing oil and gas wells, undeveloped acreage, and gathering lines	19
Pre Tax Gain On Divestiture			12,300,000
Additional Acquisitions and Divestitures (Textual) [Abstract]
Gross acquisition area in acres								20,400	112,000
Net acquisition area in acres						23,400	6,000	16,100	90,200
Acquisition costs and sale proceeds of acquisitions and divestitures			$ 64,800,000			$ 46,900,000	$ 40,000,000	$ 19,200,000	$ 26,000,000
Number of well acquired						1

XML

Derivative Financial Instruments (Details 1) (Whiting USA Trust I [Member], USD $)	Sep. 30, 2011 Barrel_of_Oil
Oct - Dec 2011 [Member] | Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	27,764
Derivative, Floor Price	$ 74.00
Derivative, Cap Price	140.75
Oct - Dec 2011 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	103,663
Derivative, Floor Price	7.00
Derivative, Cap Price	14.25
Jan - Dec 2012 [Member] | Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	105,091
Derivative, Floor Price	74.00
Derivative, Cap Price	141.72
Jan - Dec 2012 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	384,002
Derivative, Floor Price	6.50
Derivative, Cap Price	$ 14.27
Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	132,855
Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	487,665

XML

Deferred Compensation (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Additional Deferred Compensation (Textual) [Abstract]
Percentage of plan interests paid to employees at year end	100.00%
Percentage of employees vesting ratably per year	20.00%
Plan Period	P5Y
Fully vested age of employees	62
Average historical prices of crude oil	$ 78.46
Average Historical Prices of Natural Gas	4.49
Fully Vested Lump sum Cash Payment To Employees In Case Of Termination Of Plan Or Change Of Control	148,000,000
Amount attributable to proved undeveloped oil and gas properties	11,000,000
Short-term portion of Plan Liability which has been accrued as Current Payable	31,100,000
General and administrative expense [Member]
Deferred Compensation (Textual) [Abstract]
Accrued compensation expense allocation	27,600,000	21,200,000
Exploration expense [Member]
Deferred Compensation (Textual) [Abstract]
Accrued compensation expense allocation	$ 3,500,000	$ 2,900,000
Minimum [Member]
Deferred Compensation (Textual) [Abstract]
Overriding royalty interest in interest allocation prior to 1995	2.00%
Portion of Oil and Gas Sales Less Lease Operating Expenses and Production Taxes Allocated to Interest since 1995	2.00%
Maximum [Member]
Deferred Compensation (Textual) [Abstract]
Overriding royalty interest in interest allocation prior to 1995	3.00%
Portion of Oil and Gas Sales Less Lease Operating Expenses and Production Taxes Allocated to Interest since 1995	5.00%

XML

Long-Term Debt (Details Textual) (USD $)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended			1 Months Ended		1 Months Ended				9 Months Ended
	Sep. 30, 2010	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010	Oct. 12, 2011	Sep. 30, 2011 Credit agreement [Member]	Sep. 30, 2010 6.5% Senior Subordinated Notes due 2018 [Member]	Sep. 30, 2011 6.5% Senior Subordinated Notes due 2018 [Member]	Sep. 30, 2010 7.25% Senior Subordinated Notes Due 2012	Sep. 30, 2010 7.25% Senior Subordinated Notes Due 2013 [Member]	Oct. 31, 2005 7% Senior Subordinated Notes due 2014 [Member]	Sep. 30, 2011 7% Senior Subordinated Notes due 2014 [Member]	Sep. 30, 2011 Convertible perpetual preferred stock [Member]	Sep. 30, 2011 Whiting Oil and Gas and Whiting Programs, Inc [Member]
Debt Instrument [Line Items]
Interest rate on debt instrument					7.25%						6.50%				7.00%
Borrowing outstanding									$ 600,000,000
Letters of credit outstanding									1,400,000
Amount of revolving credit agreement available for additional letters of credit under the agreement									48,600,000
Interest rate on convertible perpetual preferred stock					6.25%		6.25%									6.25%
Senior Subordinated Notes issued at par										350,000,000				250,000,000
Estimated fair value of Senior Subordinated Notes											349,600,000				266,300,000
Percentage of ownership in subsidiary					15.80%												100.00%
Payment for Redemption of Senior Debt												383,500,000
Redemption of debenture												150,000,000	220,000,000
Percentage of Redemption Price												100.00%	101.8125%
Cash charge related to the redemption premium													4,000,000
Long Term Debt (Textual) [Abstract]
Extension of date for credit agreement					Apr. 01, 2016
Borrowing base of credit facility					1,100,000,000			1,500,000,000
Borrowing capacity of credit facility					498,600,000
Revolving credit facility amount used to issue letter of credit					not to exceed $50.0 million
Interest accrued at the Company's option					(i) A base rate for a base rate loan plus the margin in the table below, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% or an adjusted LIBOR rate plus 1.00%, or (ii) an adjusted LIBOR rate for a Eurodollar loan plus the margin
Interest for base rate loan plus federal fund rate					0.50%
Interest for base rate loan plus adjusted Libor rate					1.00%
Weighted average interest rate on the outstanding principal balance borrowed under the credit agreement					2.40%
Condition for credit agreement					(i) to not exceed a total debt to the last four quarters’ EBITDAX ratio (as defined in the credit agreement) of 4.25 to 1.0 for quarters ending prior to and on December 31, 2012 and 4.0 to 1.0 for quarters ending March 31, 2013 and thereafter and (ii) to have a consolidated current assets to consolidated current liabilities ratio (as defined in the credit agreement and which includes an add back of the available borrowing capacity under the credit agreement) of not less than 1.0 to 1.0.
EBITDAX ratio (percentage)		4.0	4.25
Consolidated current assets to consolidated current liabilities ratio (percentage)					1.0
Loss on early extinguishment of debt				6,235,000		6,235,000
Non cash charges	$ 2,200,000

XML

Adopted and Recently Issued Accounting Pronouncements

9 Months Ended

Sep. 30, 2011

Adopted and Recently Issued Accounting Pronouncements [Abstract]

ADOPTED AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

11. ADOPTED AND RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

In December 2010, the FASB issued Accounting Standards Update No. 2010-29, Business Combinations: Disclosure of Supplementary Pro Forma Information for Business Combinations (“ASU 2010-29”), which provides amendments to FASB ASC Topic 805, Business Combinations. The objective of ASU 2010-29 is to clarify and expand the pro forma revenue and earnings disclosure requirements for business combinations. ASU 2010-29 was effective for fiscal years beginning after December 15, 2010. The Company adopted ASU 2010-29 effective January 1, 2011, which did not have an impact on the Company’s consolidated financial statements.

In May 2011, the FASB issued Accounting Standards Update No. 2011-04, Fair Value Measurement: Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs (“ASU 2011-04”), which provides amendments to FASB ASC Topic 820, Fair Value Measurement. The objective of ASU 2011-04 is to create common fair value measurement and disclosure requirements between GAAP and International Financial Reporting Standards (“IFRS”). The amendments clarify existing fair value measurement and disclosure requirements and make changes to particular principles or requirements for measuring or disclosing information about fair value measurements. These amendments are not expected to have a significant impact on companies applying GAAP. ASU 2011-04 is effective for interim and annual periods beginning after December 15, 2011. The adoption of this standard will not have an impact on the Company’s consolidated financial statements other than additional disclosures.

In June 2011, the FASB issued Accounting Standards Update No. 2011-05, Comprehensive Income: Presentation of Comprehensive Income (“ASU 2011-05”), which provides amendments to FASB ASC Topic 220, Comprehensive Income. The objective of ASU 2011-05 is to require an entity to present the total of comprehensive income, the components of net income and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. ASU 2011-05 eliminates the option to present the components of other comprehensive income as part of the statement of equity. ASU 2011-05 is effective for interim and annual periods beginning after December 15, 2011 and should be applied retrospectively. The adoption of this standard will not have an impact on the Company’s consolidated financial statements other than requiring the Company to present its statements of comprehensive income separately from its statements of equity, as these statements are currently presented on a combined basis.

In September 2011, the FASB issued Accounting Standards Update No. 2011-08, Intangibles – Goodwill and Other: Testing Goodwill for Impairment (“ASU 2011-08”), which provides amendments to FASB ASC Topic 350, Intangibles – Goodwill and Other. The objective of ASU 2011-08 is to simplify how entities test goodwill for impairment. The amendment provides an entity with the option to first assess qualitative factors to evaluate whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the two-step goodwill impairment test described in Topic 350. ASU 2011-08 is effective for interim and annual goodwill impairment tests performed for fiscal years beginning after December 15, 2011. The adoption of this standard will not have an impact on the Company’s consolidated financial statements.

XML

Asset Retirement Obligations

9 Months Ended

Sep. 30, 2011

Asset Retirement Obligations [Abstract]

ASSET RETIREMENT OBLIGATIONS

4. ASSET RETIREMENT OBLIGATIONS

The Company’s asset retirement obligations represent the estimated future costs associated with the plugging and abandonment of oil and gas wells, removal of equipment and facilities from leased acreage, and land restoration (including removal of certain onshore and offshore facilities in California) in accordance with applicable local, state and federal laws. The Company follows FASB ASC Topic 410, Asset Retirement and Environmental Obligations, to determine its asset retirement obligation amounts by calculating the present value of the estimated future cash outflows associated with its plug and abandonment obligations. The current portions at September 30, 2011 and December 31, 2010 were $4.4 million and $6.1 million, respectively, and are included in accrued liabilities and other. Revisions to the liability could occur due to changes in estimated abandonment costs or well economic lives, or if federal or state regulators enact new requirements regarding the abandonment of wells. The following table provides a reconciliation of the Company’s asset retirement obligations for the nine months ended September 30, 2011 (in thousands):

Asset retirement obligation at January 1, 2011	$	83,083
Additional liability incurred		1,711
Revisions in estimated cash flows		419
Accretion expense		5,949
Obligations on sold properties		(790	)
Liabilities settled		(3,147	)
Asset retirement obligation at September 30, 2011	$	87,225

XML

Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2011

Long-Term Debt [Abstract]

Long Term Debt

	September 30, 2011		December 31, 2010
Credit agreement	$	600,000	$	200,000
6.5% Senior Subordinated Notes due 2018		350,000		350,000
7% Senior Subordinated Notes due 2014		250,000		250,000
Total debt	$	1,200,000	$	800,000

Summary of margin rates and commitment fees

Ratio of Outstanding Borrowings to Borrowing Base	Applicable Margin for Base Rate Loans			Applicable Margin for Eurodollar Loans			Commitment Fee
Less than 0.25 to 1.0		0.50	%		1.50	%		0.375	%
Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0		0.75	%		1.75	%		0.375	%
Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0		1.00	%		2.00	%		0.50	%
Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0		1.25	%		2.25	%		0.50	%
Greater than or equal to 0.90 to 1.0		1.50	%		2.50	%		0.50	%

XML

Fair Value Measurments (Details 1) (USD $) In Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Reconciliation of changes in the fair value of financial assets (liabilities) designated as Level 3 in the valuation hierarchy
Fair value asset (liability), beginning of period	$ 0	$ 0
Unrealized gains (losses) on embedded commodity derivative contracts included in earnings	13,196	13,196
Transfers in to (out of) Level 3	1,899	1,899
Fair value asset (liability), end of period	$ 15,095	$ 15,095

XML

Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified									9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Credit agreement [Member]	Dec. 31, 2010 Credit agreement [Member]	Sep. 30, 2011 6.5% Senior Subordinated Notes due 2018 [Member]	Dec. 31, 2010 6.5% Senior Subordinated Notes due 2018 [Member]	Sep. 30, 2011 7% Senior Subordinated Notes due 2014 [Member]	Dec. 31, 2010 7% Senior Subordinated Notes due 2014 [Member]	Sep. 30, 2011 Less than 0.25 to 1.0 [Member]	Sep. 30, 2011 Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0 [Member]	Sep. 30, 2011 Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0 [Member]	Sep. 30, 2011 Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0 [Member]	Sep. 30, 2011 Greater than or equal to 0.90 to 1.0 [Member]
Long Term Debt
Total debt	$ 1,200,000	$ 800,000	$ 600,000	$ 200,000	$ 350,000	$ 350,000	$ 250,000	$ 250,000
Summary of margin rates
Ratio of Outstanding Borrowings to Borrowing Base									Less than 0.25 to 1.0	Greater than or equal to 0.25 to 1.0 but less than 0.50 to 1.0	Greater than or equal to 0.50 to 1.0 but less than 0.75 to 1.0	Greater than or equal to 0.75 to 1.0 but less than 0.90 to 1.0	Greater than or equal to 0.90 to 1.0
Applicable Margin for Base Rate Loans									0.50%	0.75%	1.00%	1.25%	1.50%
Applicable Margin for Eurodollar Loans									1.50%	1.75%	2.00%	2.25%	2.50%
Commitment Fee									0.375%	0.375%	0.50%	0.50%	0.50%

XML

Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 428,798	$ 270,460
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	340,868	289,836
Deferred income tax expense	248,728	159,475
Amortization of debt issuance costs and debt discount	6,357	8,525
Stock-based compensation	10,086	6,585
Amortization of deferred gain on sale	(10,455)	(11,613)
Gain on sale of properties	(14,732)	(1,918)
Undeveloped leasehold and oil and gas property impairments	24,920	12,054
Exploratory dry hole costs	4,714	2,796
Loss on early extinguishment of debt		6,235
Change in Production Participation Plan liability	3,060	9,550
Unrealized (gain) loss on derivative contracts	(151,047)	(82,213)
Other non-current	(8,285)	(4,495)
Changes in current assets and liabilities:
Accounts receivable trade	(31,229)	(30,273)
Prepaid expenses and other	61	(637)
Accounts payable trade and accrued liabilities	(13,999)	49,464
Revenues and royalties payable	22,061	29,221
Taxes payable	3,848	7,215
Net cash provided by operating activities	863,754	720,267
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash acquisition capital expenditures	(233,521)	(102,256)
Drilling and development capital expenditures	(1,077,605)	(473,697)
Proceeds from sale of oil and gas properties	69,246	7,875
Issuance of note receivable	(25,000)
Net cash used in investing activities	(1,266,880)	(568,078)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of 6.5% Senior Subordinated Notes due 2018		350,000
Redemption of 7.25% Senior Subordinated Notes due 2012		(150,000)
Redemption of 7.25% Senior Subordinated Notes due 2013		(223,988)
Premium on induced conversion of 6.25% convertible perpetual preferred stock		(47,529)
Contributions from noncontrolling interest	2,500
Preferred stock dividends paid	(808)	(16,172)
Long-term borrowings under credit agreement	1,380,000	850,000
Repayments of long-term borrowings under credit agreement	(980,000)	(910,000)
Debt issuance costs	(2,381)	(7,570)
Restricted stock used for tax withholdings	(9,049)	(5,679)
Net cash provided by (used in) financing activities	390,262	(160,938)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(12,864)	(8,749)
CASH AND CASH EQUIVALENTS:
Beginning of period	18,952	11,960
End of period	6,088	3,211
NONCASH INVESTING ACTIVITIES:
Accrued capital expenditures	112,526	73,682
NONCASH FINANCING ACTIVITIES:
Contributions from noncontrolling interest	5,833
Issuance of common stock related to the induced conversion of preferred stock		317,406
Preferred stock cancelled in connection with its induced conversion		$ (317,406)

XML

Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2011

Asset Retirement Obligations [Abstract]

Asset retirement obligations

Asset retirement obligation at January 1, 2011	$	83,083
Additional liability incurred		1,711
Revisions in estimated cash flows		419
Accretion expense		5,949
Obligations on sold properties		(790	)
Liabilities settled		(3,147	)
Asset retirement obligation at September 30, 2011	$	87,225

XML

Earnings Per Share (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Numerator:
Net income	$ 206,235,000		$ 58,532,000		$ 428,798,000		$ 270,460,000
Preferred stock dividends	(269,000)		(52,077,000)		(808,000)		(62,859,000)
Net income available to common shareholders, basic	205,966,000		6,455,000		427,990,000		207,601,000
Denominator:
Weighted average shares outstanding, basic	117,381,000	[1]	104,296,000	[1]	117,333,000	[1]	102,712,000	[1]
Numerator:
Net income available to common shareholders, basic	205,966,000		6,455,000		427,990,000		207,601,000
Preferred stock dividends	269,000				808,000		809,000
Adjusted net income available to common shareholders, diluted	206,235,000		6,455,000		428,798,000		208,410,000
Denominator:
Weighted average shares outstanding, basic	117,381,000	[1]	104,296,000	[1]	117,333,000	[1]	102,712,000	[1]
Restricted stock and stock options	364,000		611,000		445,000		686,000
Convertible perpetual preferred stock	794,000				794,000		794,000
Weighted average shares outstanding, diluted	118,539,000	[1]	104,907,000	[1]	118,572,000	[1]	104,192,000	[1]
Earnings per common share, basic	$ 1.75	[1]	$ 0.06	[1]	$ 3.65	[1]	$ 2.02	[1]
Earnings per common share, diluted	$ 1.74	[1]	$ 0.06	[1]	$ 3.62	[1]	$ 2.00	[1]
Earnings Per Share, Basic and Diluted, (Textual) [Abstract]
Anti-dilutive restricted stock and stock options excluded from diluted earnings per share calculation			13,595,128				14,323,762
Shares excluded from Earnings Per Share calculation, Stock Options	27,769				1,260
Shares excluded from Earnings Per Share calculation, Restricted Stock	152,229				174,814
Decrease in preferred stock dividends accumulated			$ 800,000				$ 800,000

[1] All share and per share amounts have been retroactively restated for the 2010 periods to reflect the Company's two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.

XML

Fair Value Measurments (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Fair value assets and liabilities measured on a recurring basis

		$19,956		$19,956		$19,956		$19,956
	Level 1		Level 2		Level 3		Total Fair  Value September 30, 2011
Financial Assets
Commodity derivatives - current	$	—	$	19,956	$	—	$	19,956
Embedded commodity derivatives - current		—		998		—		998
Commodity derivatives - non-current		—		1,801		—		1,801
Embedded commodity derivatives - non-current		—		1,539		15,095		16,634
Total financial assets	$	—	$	24,294	$	15,095	$	39,389
Financial Liabilities
Commodity derivatives - current	$	—	$	20,682	$	—	$	20,682
Commodity derivatives - non-current		—		31,424		—		31,424
Total financial liabilities	$	—	$	52,106	$	—	$	52,106

		$164,631		$164,631		$164,631		$164,631
	Level 1		Level 2		Level 3		Total Fair  Value December 31, 2010
Financial Assets
Commodity derivatives - current	$	—	$	4,231	$	—	$	4,231
Commodity derivatives - non-current		—		3,961		—		3,961
Total financial assets	$	—	$	8,192	$	—	$	8,192
Financial Liabilities
Commodity derivatives - current	$	—	$	69,375	$	—	$	69,375
Commodity derivatives - non-current		—		95,256		—		95,256
Total financial liabilities	$	—	$	164,631	$	—	$	164,631

Reconciliation of changes in the fair value of financial assets (liabilities) designated as Level 3 in the valuation hierarchy

	Three Months Ended September 30, 2011		Nine Months Ended September 30, 2011
Fair value asset (liability), beginning of period	$	—	$	—
Unrealized gains (losses) on embedded commodity derivative contracts included in earnings (1)		13,196		13,196
Transfers in to (out of) Level 3 (2)		1,899		1,899
Fair value asset (liability), end of period	$	15,095	$	15,095

(1) Included in commodity derivative (gain) loss, net in the consolidated statements of income.

(2) With respect to forward prices for NYMEX crude oil where there is a lack of price transparency in certain future periods during the term of the CO₂ contract, such unobservable oil price inputs became significant to the valuation methodology, and the contract’s fair value was therefore transferred from Level 2 to Level 3 within the valuation hierarchy.

XML

Consolidated Statements of Equity and Comprehensive Income (Parenthetical) (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
OCI amortization on de-designated hedges, taxes	$ 2,702	$ 7,242
Accumulated Other Comprehensive Income (Loss)
OCI amortization on de-designated hedges, taxes	2,702	7,242
Total Whiting Shareholders' Equity
OCI amortization on de-designated hedges, taxes	2,702	7,242
Comprehensive Income (Loss)
OCI amortization on de-designated hedges, taxes	$ 2,702	$ 7,242

XML

Income Taxes

9 Months Ended

Sep. 30, 2011

Income Taxes [Abstract]

INCOME TAXES

9. INCOME TAXES

Income tax expense during interim periods is based on applying an estimated annual effective income tax rate to year-to-date income, plus any significant unusual or infrequently occurring items which are recorded in the interim period. The provision for income taxes for the nine months ended September 30, 2011 and 2010 differs from the amount that would be provided by applying the statutory U.S. federal income tax rate of 35% to pre-tax income primarily because of state income taxes and estimated permanent differences.

The computation of the annual estimated effective tax rate at each interim period requires certain estimates and significant judgment including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in various jurisdictions, permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, more experience is obtained, additional information becomes known or as the tax environment changes.

XML

Derivative Financial Instruments (Details 2) (Third-party Public Holders of Trust Units [Member], USD $)	Sep. 30, 2011 Barrel_of_Oil
Oct - Dec 2011 [Member] | Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	86,962
Derivative, Floor Price	$ 74.00
Derivative, Cap Price	140.75
Oct - Dec 2011 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	324,698
Derivative, Floor Price	7.00
Derivative, Cap Price	14.25
Jan - Dec 2012 [Member] | Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	329,171
Derivative, Floor Price	74.00
Derivative, Cap Price	141.72
Jan - Dec 2012 [Member] | Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	1,202,784
Derivative, Floor Price	6.50
Derivative, Cap Price	$ 14.27
Crude Oil [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	416,133
Natural gas [Member]
Derivative [Line Items]
Number of Price Risk Derivatives Held	1,527,482

XML

Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2011

Basis of Presentation [Abstract]

Description of Operations

Description of Operations—Whiting Petroleum Corporation, a Delaware corporation, is an independent oil and gas company that acquires, exploits, develops and explores for crude oil, natural gas and natural gas liquids primarily in the Permian Basin, Rocky Mountains, Mid-Continent, Gulf Coast and Michigan regions of the United States. Unless otherwise specified or the context otherwise requires, all references in these notes to “Whiting” or the “Company” are to Whiting Petroleum Corporation and its consolidated subsidiaries.

Consolidated Financial Statements

Consolidated Financial Statements—The unaudited consolidated financial statements include the accounts of Whiting Petroleum Corporation, its consolidated subsidiaries and Whiting’s pro rata share of the accounts of Whiting USA Trust I pursuant to Whiting’s 15.8% ownership interest. Investments in entities which give Whiting significant influence, but not control, over the investee are accounted for using the equity method. Under the equity method, investments are stated at cost plus the Company’s equity in undistributed earnings and losses. All intercompany balances and transactions have been eliminated upon consolidation. These financial statements have been prepared in accordance with GAAP for interim financial reporting. In the opinion of management, the accompanying financial statements include all adjustments (consisting of normal recurring accruals and adjustments) necessary to present fairly, in all material respects, the Company’s interim results. However, operating results for the periods presented are not necessarily indicative of the results that may be expected for the full year. Whiting’s 2010 Annual Report on Form 10-K includes certain definitions and a summary of significant accounting policies and should be read in conjunction with this Form 10-Q. Except as disclosed herein, there have been no material changes to the information disclosed in the notes to the consolidated financial statements included in Whiting’s 2010 Annual Report on Form 10-K.

Earnings Per Share

Earnings Per Share—Basic earnings per common share is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during each period. Diluted earnings per common share is calculated by dividing adjusted net income available to common shareholders by the weighted average number of diluted common shares outstanding, which includes the effect of potentially dilutive securities. Potentially dilutive securities for the diluted earnings per share calculations consist of unvested restricted stock awards and outstanding stock options using the treasury method, as well as convertible perpetual preferred stock using the if-converted method. In the computation of diluted earnings per share, excess tax benefits that would be created upon the assumed vesting of unvested restricted shares or the assumed exercise of stock options (i.e. hypothetical excess tax benefits) are included in the assumed proceeds component of the treasury share method to the extent that such excess tax benefits are more likely than not to be realized. When a loss from continuing operations exists, all potentially dilutive securities are anti-dilutive and are therefore excluded from the computation of diluted earnings per share.

FASB ASC Topic 410, Asset Retirement and Environmental Obligations

The Company’s asset retirement obligations represent the estimated future costs associated with the plugging and abandonment of oil and gas wells, removal of equipment and facilities from leased acreage, and land restoration (including removal of certain onshore and offshore facilities in California) in accordance with applicable local, state and federal laws. The Company follows FASB ASC Topic 410, Asset Retirement and Environmental Obligations, to determine its asset retirement obligation amounts by calculating the present value of the estimated future cash outflows associated with its plug and abandonment obligations.

FASB ASC Topic 815, Derivatives and Hedging

The Company is exposed to certain risks relating to its ongoing business operations, and Whiting uses derivative instruments to manage its commodity price risk. Whiting follows FASB ASC Topic 815, Derivatives and Hedging, to account for its derivative financial instruments.

FASB ASC Topic 820, Fair Value Measurement and Disclosure

The Company follows FASB ASC Topic 820, Fair Value Measurement and Disclosure, which establishes a three-level valuation hierarchy for disclosure of fair value measurements. The valuation hierarchy categorizes assets and liabilities measured at fair value into one of three different levels depending on the observability of the inputs employed in the measurement. The three levels are defined as follows:

• Level 1: Quoted Prices in Active Markets for Identical Assets – inputs to the valuation methodology are quoted prices (unadjusted) for identical assets or liabilities in active markets.

• Level 2: Significant Other Observable Inputs – inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument.

• Level 3: Significant Unobservable Inputs – inputs to the valuation methodology are unobservable and significant to the fair value measurement.

XML

Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 6,088		$ 18,952
Accounts receivable trade, net	230,942		199,713
Prepaid expenses and other	31,540		14,878
Total current assets	268,570		233,543
Oil and gas properties, successful efforts method:
Proved properties	6,724,836		5,661,619
Unproved properties	362,963		226,336
Other property and equipment	144,158		98,092
Total property and equipment	7,231,957		5,986,047
Less accumulated depreciation, depletion and amortization	(1,961,365)		(1,630,824)
Total property and equipment, net	5,270,592		4,355,223
Debt issuance costs	31,782		34,226
Other long-term assets	76,562		25,785
TOTAL ASSETS	5,647,506		4,648,777
Current liabilities:
Accounts payable trade	30,389		35,016
Accrued capital expenditures	112,526		84,789
Accrued liabilities and other	133,752		153,062
Revenues and royalties payable	104,185		82,124
Taxes payable	34,139		30,291
Derivative liabilities	20,682		69,375
Deferred income taxes	2,713		4,548
Total current liabilities	438,386		459,205
Long-term debt	1,200,000		800,000
Deferred income taxes	786,932		539,071
Derivative liabilities	31,424		95,256
Production Participation Plan liability	84,584		81,524
Asset retirement obligations	82,842		76,994
Deferred gain on sale	32,618		41,460
Other long-term liabilities	26,669		23,952
Total liabilities	2,683,455		2,117,462
Commitments and contingencies
Equity:
Preferred stock, $0.001 par value, 5,000,000 shares authorized; 6.25% convertible perpetual preferred stock, 172,400 shares issued and outstanding as of September 30, 2011 and 172,500 shares issued and outstanding as of December 31, 2010, aggregate liquidation preference of $17,240,000 at September 30, 2011
Common stock, $0.001 par value, 300,000,000 shares authorized; 118,109,058 issued and 117,380,843 outstanding as of September 30, 2011, 117,967,876 issued and 117,098,506 outstanding as of December 31, 2010	118	[1]	59	[1]
Additional paid-in capital	1,550,800		1,549,822
Accumulated other comprehensive income	1,144		5,768
Retained earnings	1,403,656		975,666
Total Whiting shareholders' equity	2,955,718		2,531,315
Noncontrolling interest	8,333		0
Total equity	2,964,051		2,531,315
TOTAL LIABILITIES AND EQUITY	$ 5,647,506		$ 4,648,777

[1] All common share amounts (except par value and par value per share amounts) have been retroactively restated as of December 31, 2010 to reflect the Company's two-for-one stock split in February 2011, as described in Note 8 to these consolidated financial statements.

XML

Derivative Financial Instruments (Details 4) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Commodity contracts [Member] | Gain on hedging activities [Member] | ASC 815 Cash Flow Hedging Relationship [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Accumulated Other Comprehensive Income as of June 30, 2011 from Derivative Contracts	$ 1,871	$ 4,383	$ 7,326	$ 19,641
Commodity contracts [Member] | Commodity derivative gain loss net [Member] | Not Designated as ASC 815 Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) Loss Recognized in Income	(121,734)	31,765	(100,439)	(46,654)
Embedded commodity contracts [Member] | Commodity derivative gain loss net [Member] | Not Designated as ASC 815 Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) Loss Recognized in Income	(17,158)		(17,632)
Not Designated as ASC 815 Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Gain) Loss Recognized in Income	$ (138,892)	$ 31,765	$ (118,071)	$ (46,654)

XML

Subsequent Event (Details) (USD $) In Billions	Oct. 12, 2011	Sep. 30, 2011
Subsequent Events (Textual) [Abstract]
Existing credit agreement that increased the Company's borrowing base under the facility	$ 1.5	$ 1.1

XML

Derivative Financial Instruments (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2011 Year Contract	Dec. 31, 2010
Derivative Financial Instruments [Abstract]
Sale of Trust units to the public	11,677,500
Retention of net proceeds from the underlying properties	10.00%
Ownership Trust Units	2,186,389
Share of third-party public holders of trust units	75.80%
Share of company in trust units	24.20%
Accumulated other comprehensive income loss cumulative changes in net gain loss from cash flow hedges	$ 1,800,000
Accumulated other comprehensive income	1,144,000	5,768,000
Cash flow hedge reclassified into earnings from accumulated other comprehensive income during the next 12 months	2,300,000
Number of Contracts with drilling rig companies	4
Termination date range for drilling rig contracts	From November 2011 to September 2014
Increase decrease in price of crude oil, price adjustment formula	10
The aggregate estimated fair value of the embedded derivatives in drilling rig contracts (Asset)	2,500,000
Termination date range for CO2 contract	2015 through 2029
The estimated fair value of the embedded derivative in this CO2 purchase contract (Asset)	$ 15,100,000