UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Mark One)
x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2002
	OR
o	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 001-14273

CORE LABORATORIES N.V.

(Exact name of registrant as specified in its charter)

The Netherlands (State of other jurisdiction of incorporation or organization)	Not Applicable (I.R.S. Employer Identification No.)
Herengracht 424 1017 BZ Amsterdam The Netherlands (Address of principal executive offices)	Not Applicable (Zip Code)

Registrant’s telephone number, including area code: (31-20) 420-3191

     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 X No

     The number of common shares of the Registrant, par value EUR 0.01 per share, outstanding at August 8, 2002 was 33,264,821.

TABLE OF CONTENTS

		CONSOLIDATED BALANCE SHEETS
		CONSOLIDATED STATEMENTS OF OPERATIONS
		CONSOLIDATED STATEMENTS OF OPERATIONS
		CONSOLIDATED STATEMENTS OF CASH FLOWS
		NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
	QUANTITATIVE AND QUALITATIVE DISCLOSURES OF MARKET RISK
PART II — OTHER INFORMATION
	Item 1. Legal Proceedings.
	Item 2. Changes in Securities.
	Item 3. Defaults Upon Senior Securities.
	Item 4. Submission of Matters to a Vote of Security Holders.
	Item 5. Other Information.
	Item 6. Exhibits and Reports on Form 8-K.
SIGNATURE
CERTIFICATION

CORE LABORATORIES N.V.
FORM 10-Q/A FOR THE QUARTER ENDED JUNE 30, 2002

INDEX

			Page
Part I — Financial Information
	Item 1 - Financial Statements
		Consolidated Balance Sheets at June 30, 2002 and December 31, 2001		1
		Consolidated Statements of Operations for the Three Months Ended June 30, 2002 and 2001		2
		Consolidated Statements of Operations for the Six Months Ended June 30, 2002 and 2001		3
		Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2002 and 2001		4
		Notes to Consolidated Financial Statements		5
	Item 2 - Management’s Discussion and Analysis of Financial Condition and Results of Operations			13
	Item 3 - Quantitative & Qualitative Disclosures of Market Risk			19
Part II — Other Information
	Item 1 - Legal Proceedings			20
	Item 2 - Changes in Securities			20
	Item 3 - Defaults Upon Senior Securities			20
	Item 4 - Submission of Matters to a Vote of Security Holders			20
	Item 5 - Other Information			20
	Item 6 - Exhibits and Reports on Form 8-K			20
Signature				21

(ii)

EXPLANATORY NOTE

     Core Laboratories N.V. (“Core Laboratories”, “we”, “our” or “us”) is filing this amendment to its Quarterly Report on Form 10-Q for the quarter ended June 30, 2002 to reflect the restatement of certain previously reported information. Portions of Part I, Item 1 “Financial Statements” and Part I, Item 2 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” have been amended to reflect this restatement. The remaining information in this amended Form 10-Q has not been updated to reflect any changes in information that may have occurred subsequent to the date of the reporting period to which this Form 10-Q relates. Additional information relating to the restatement is contained in Note 9 of the Notes to the Consolidated Financial Statements.

(iii)

CORE LABORATORIES N.V.
CONSOLIDATED BALANCE SHEETS
(in thousands, except share and per share data)

					June 30,		December 31,
					2002		2001
					(Unaudited)
					(Restated)
					Note 9
ASSETS
CURRENT ASSETS:
	Cash and cash equivalents				$	16,964	$	14,456
	Accounts receivable, less allowance for doubtful accounts of $9,986 and $7,829 in 2002 and 2001, respectively					83,637		104,933
	Inventories					39,106		41,109
	Prepaid expenses and other current assets					12,841		9,728
	Deferred tax asset					9,691		9,123
				Total current assets		162,239		179,349
PROPERTY, PLANT AND EQUIPMENT, net						97,579		97,615
INTANGIBLES, GOODWILL AND OTHER LONG-TERM ASSETS, net						143,608		162,536
				Total assets	$	403,426	$	439,500
LIABILITIES AND SHAREHOLDERS’ EQUITY
CURRENT LIABILITIES:
		Current maturities of long-term debt			$	30	$	454
		Accounts payable				15,601		19,721
		Other accrued expenses				15,866		19,832
			Total current liabilities			31,497		40,007
LONG-TERM DEBT						89,000		95,089
OTHER LONG-TERM LIABILITIES						21,175		27,983
MINORITY INTEREST						794		815
SHAREHOLDERS’ EQUITY:
	Preference shares, EUR 0.01 par value; 3,000,000 shares authorized, no shares issued or outstanding					—		—
	Common shares, EUR 0.01 par value; 100,000,000 shares authorized, 33,264,821 and 33,204,571 issued and outstanding in 2002 and 2001, respectively					546		546
	Additional paid-in capital					187,303		186,751
	Retained earnings					73,111		88,309
				Total shareholders’ equity		260,960		275,606
				Total liabilities and shareholders’ equity	$	403,426	$	439,500

The accompanying notes are an integral part of these consolidated financial statements.

1

CORE LABORATORIES N.V.
CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share data)

		Three Months Ended
		June 30,
		2002		2001
		(Unaudited)
		(Restated) Note 9
SERVICES		$	72,691	$	74,110
SALES			13,760		17,150
			86,451		91,260
OPERATING EXPENSES:
	Cost of services		58,993		56,881
	Cost of sales		12,613		13,017
	General and administrative expenses		5,106		3,984
	Depreciation and amortization		5,010		4,569
	Goodwill amortization		—		1,033
	Other, net		630		(982	)
			82,352		78,502
INCOME FROM OPERATIONS			4,099		12,758
INTEREST EXPENSE			1,927		1,943
INCOME BEFORE INCOME TAX EXPENSE			2,172		10,815
INCOME TAX EXPENSE			912		3,028
NET INCOME		$	1,260	$	7,787
PER SHARE INFORMATION:
	BASIC EARNINGS PER SHARE	$	0.04	$	0.24
	WEIGHTED AVERAGE BASIC COMMON SHARES OUTSTANDING		33,246		33,044
	DILUTED EARNINGS PER SHARE	$	0.04	$	0.23
	WEIGHTED AVERAGE DILUTED COMMON SHARES OUTSTANDING		33,866		34,192

The accompanying notes are an integral part of these consolidated financial statements.

2

CORE LABORATORIES N.V.
CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share data)

			Six Months Ended
			June 30,
			2002			2001
			(Unaudited)
			(Restated) Note 9
SERVICES			$	141,869		$	147,635
SALES				28,865			34,971
				170,734			182,606
OPERATING EXPENSES:
	Cost of services			116,113			113,305
	Cost of sales			26,477			28,093
	General and administrative expenses			9,834			7,543
	Depreciation and amortization			9,932			8,953
	Goodwill amortization			—			2,066
	Other, net			1,900			(582	)
				164,256			159,378
INCOME FROM OPERATIONS				6,478			23,228
INTEREST EXPENSE				3,903			3,921
INCOME BEFORE INCOME TAX EXPENSE AND CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE				2,575			19,307
INCOME TAX EXPENSE				1,081			5,406
INCOME BEFORE CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE				1,494			13,901
CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE				(16,692	)		—
NET (LOSS) INCOME			$	(15,198	)	$	13,901
PER SHARE INFORMATION:
	BASIC EARNINGS PER SHARE BEFORE CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE		$	0.04		$	0.42
	CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE			(0.50	)		—
		BASIC (LOSS) EARNINGS PER SHARE	$	0.46		$	0.42
	WEIGHTED AVERAGE BASIC COMMON SHARES OUTSTANDING			33,228			32,965
	DILUTED EARNINGS PER SHARE BEFORE CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE		$	0.04		$	0.41
	CUMULATIVE EFFECT OF CHANGE IN ACCOUNTING PRINCIPLE			(0.50	)		—
		DILUTED (LOSS) EARNINGS PER SHARE	$	(0.46	)	$	0.41
	WEIGHTED AVERAGE DILUTED COMMON SHARES OUTSTANDING			33,228			34,124

The accompanying notes are an integral part of these consolidated financial statements.

3

CORE LABORATORIES N.V.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)

				Six Months Ended
				June 30,
				2002			2001
				(Unaudited)
				(Restated) Note 9
CASH FLOWS FROM OPERATING ACTIVITIES:
			Net cash provided by operating activities	$	18,996		$	12,981
CASH FLOWS FROM INVESTING ACTIVITIES:
	Capital expenditures				(11,159	)		(13,781	)
	Proceeds from sale of fixed assets				1,037			79
	Other				(467	)		15
		Net cash used in investing activities			(10,589	)		(13,687	)
CASH FLOWS FROM FINANCING ACTIVITIES:
	Payments of long-term debt				(10,443	)		(4,100	)
	Borrowings under long-term debt				4,003			5,070
	Capital lease obligation, net				(18	)		(161	)
	Exercise of stock options				552			2,576
	Other				7			(37	)
		Net cash used in financing activities			(5,899	)		3,348
NET INCREASE IN CASH AND CASH EQUIVALENTS					2,508			2,642
CASH AND CASH EQUIVALENTS, beginning of period					14,456			12,519
CASH AND CASH EQUIVALENTS, end of period				$	16,964		$	15,161

The accompanying notes are an integral part of these consolidated financial statements.

4

CORE LABORATORIES N.V.
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)

1. BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

     The accompanying unaudited consolidated financial statements include the accounts of Core Laboratories N.V. and have been prepared in accordance with United States of America (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial information using the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the six-month period ended June 30, 2002 are not necessarily indicative of the results that may be expected for the year ending December 31, 2002. Balance sheet information as of December 31, 2001 was derived from the 2001 annual audited consolidated financial statements. These financial statements should be read in conjunction with the consolidated financial statements and the summary of significant accounting policies and notes thereto included in our Form 10-K for the year ended December 31, 2001. Certain prior year amounts have been reclassified to conform to the current year presentation.

Recent Pronouncements

     In August 2001, the FASB issued SFAS 144, “Accounting for the Impairment or Disposal of Long-Lived Assets.” SFAS 144 addresses the financial accounting and reporting for the impairment or disposal of long-lived assets. SFAS 144 supersedes SFAS 121, “Accounting for the Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed of.” SFAS 144 provides updated guidance concerning the recognition and measurement of an impairment loss for certain types of long-lived assets and modifies the accounting and reporting of discontinued operations. SFAS 144 is effective for fiscal years beginning after December 31, 2001. We do not expect SFAS 144 to have a material adverse effect on our financial position or results of operations.

5

2. INVENTORIES

     Inventories consist of manufactured goods, materials and supplies used for sales or services provided to customers. Inventories are stated at the lower of average or standard cost (includes direct material, labor and overhead) or estimated net realizable value and are reflected net of valuation reserves of approximately $1,695,000 and $1,847,000 at June 30, 2002 and December 31, 2001, respectively. Inventories consisted of the following (in thousands):

		June 30,		December 31,
		2002		2001
		(Unaudited)
		(Restated) Note 9
Finished goods		$	28,508	$	30,120
Parts and materials			5,744		6,561
Work in process			4,854		4,428
	Total inventories	$	39,106	$	41,109

3. BUSINESS COMBINATIONS, INTANGIBLES AND GOODWILL

     Intangibles include patents, trademarks, service marks and trade names. Goodwill represents the excess of purchase price over the fair value of the net assets and individual intangibles acquired in acquisitions accounted for under the purchase method of accounting. Intangibles are charged to expense in equal amounts over their estimated useful lives.

     In June 2001, the FASB issued two statements, SFAS 141, “Business Combinations”, and SFAS 142, “Goodwill and Other Intangible Assets”, that amend Accounting Principles Board (“APB”) Opinion No. 16, “Business Combinations”, and supersede APB Opinion No. 17, “Intangible Assets.” SFAS 141 eliminates the pooling-of-interests method of accounting for business combinations and establishes the purchase method of accounting as the only acceptable method on all business combinations initiated after June 30, 2001. This statement requires that goodwill resulting from a business combination after June 30, 2001 be recognized as an asset but not amortized, while goodwill existing at June 30, 2001 was amortized through December 31, 2001. Beginning January 1, 2002, we no longer amortize goodwill but will test for impairment annually or more frequently if circumstances indicate a potential impairment. We determined our reporting unit level to be our operating units. Using the discounted cash flow method under the requirements of SFAS 142, we have reflected impairment of goodwill of approximately $16.7 million related to our Reservoir Management Segment as a result of adoption of SFAS 142 on January 1, 2002. This impairment was recorded in the first quarter of 2002 and is reflected in the statement of operations as a cumulative effect of change in accounting principle. The cessation of goodwill amortization under the guidelines will result in a reduction of approximately $4.2 million in annual operating expenses, assuming no additional impairment of goodwill. Proforma information relating to goodwill amortization is presented in the following tables:

Net Income
(in thousands)	Three Months Ended June 30,					Six Months Ended June 30,
			(Unaudited)					(Unaudited)
	2002					2002
	(Restated) Note 9			2001		(Restated) Note 9			2001
Reported net income (loss)	$	1,260		$	7,787	$	(15,198	)	$	13,901
Add back: Goodwill amortization		—			1,033		—			2,066
Adjusted net income (loss)	$	1,260		$	8,820	$	(15,198	)	$	15,967

6

Basic Earnings per Share	Three Months Ended June 30,					Six Months Ended June 30,
			(unaudited)					(unaudited)
	2002					2002
	(Restated) Note 9			2001		(Restated) Note 9			2001
Reported net income (loss)	$	0.04		$	0.24	$	(0.46	)	$	0.42
Add back: Goodwill amortization		—			0.03		—			0.06
Adjusted net income (loss)	$	0.04		$	0.27	$	(0.46	)	$	0.48

Diluted Earnings per Share	Three Months Ended June 30,					Six Months Ended June 30,
			(unaudited)					(unaudited)
	2002					2002
	(Restated) Note 9			2001		(Restated) Note 9			2001
Reported net income (loss)	$	0.04		$	0.23	$	(0.46	)	$	0.41
Add back: Goodwill amortization		—			0.03		—			0.06
Adjusted net income (loss)	$	0.04		$	0.26	$	(0.46	)	$	0.47

4. LONG-TERM DEBT

     Long-term debt is summarized in the following table (in thousands):

		June 30,		December 31,
		2002		2001
		(Unaudited)
Credit Facility with a bank group:
	$100,000 revolving debt facilities	$	14,000	$	20,000
Senior Notes			75,000		75,000
Other indebtedness			30		543
	Total debt		89,030		95,543
Less — current maturities			30		454
	Total long-term debt	$	89,000	$	95,089

     In July 1999, we entered into a $100 million Credit Facility which provides for (i) a committed revolving debt facility of $95 million and (ii) a Euro denominated revolving debt facility with U.S. dollar equivalency of $5 million. At June 30, 2002, approximately $86 million was available for borrowing under the revolving Credit Facility. Loans under the Credit Facility bear interest from LIBOR plus 1.25% to a maximum of LIBOR plus 1.75%. The average interest rate in effect at June 30, 2002 was 3.26%, and the average for 2002 was 3.28%. The revolving Credit Facility requires interest payments only, until maturity in June 2004.

     In July 1999, we issued $75 million in Senior Notes which bear an average interest rate of 8.16% and require annual principal payments beginning in July 2005 and continuing through July 2011.

     The terms of the Credit Facility and Senior Notes require us to meet certain financial covenants, including certain minimum equity and cash flow tests. We believe that we are in compliance with all

7

such covenants contained in our credit agreements. All of our material wholly owned subsidiaries are guarantors or co-borrowers under both credit agreements.

5. RESTRUCTURING CHARGES

     During the fourth quarter of 2001, we had several transactions which impacted certain operations that were not viewed as ongoing. We restructured certain operations in Mexico, the United Kingdom, the U.S. and other countries to improve operating efficiencies. This restructuring expense included write-offs of assets and leasehold improvements and an accrual for facility restoration, severance benefits and lease termination costs. Approximately 100 field employees were terminated. In the second quarter of 2002, we relocated a facility from Mexico City, Mexico to Villahermosa, Mexico and we intend to relocate one of our operations from Dallas to the Houston Advanced Technology Center in the second half of 2002. This charge of approximately $3.0 million affected each of our operating segments as follows: Reservoir Description - $0.8 million; Production Enhancement — $0.1 million; Reservoir Management - $2.1 million. Substantially all employee terminations were completed by the end of the first quarter of 2002. Total cash required for this restructuring charge of $2.1 million will be funded from operating activities. Cash required for the costs incurred through June 30, 2002 was $1.3 million. This charge is summarized in the following table:

Restructuring Charges
(in thousands)
	Lease						Asset
	Obligations		Severance		Restoration		Write-offs1		Other		Total
Total restructuring charges	$	598	$	951	$	380	$	862	$	184	$	2,975
Less: Costs incurred through December 31, 2001		38		394		—		862		40		1,334
Accrual remaining at December 31, 2001		560		557		380		—		144		1,641
Less: Costs incurred through June 30, 2002 (unaudited)		78		557		230		—		6		871
Accrual remaining at June 30, 2002 (unaudited)	$	482	$	—	$	150	$	—	$	138	$	770

1) The fixed assets and leasehold improvements were disposed of by the end of December 2001. The write-off approximates the carrying amount as these assets were abandoned or sold for salvage value. Depreciation expense was reduced by approximately $20 in 2001 and will be reduced by $82 in 2002 and $281 thereafter. The asset write-offs of $862 were attributable to the Reservoir Management segment.

6. SEGMENT REPORTING

     Our business units have been aggregated into three complementary segments which provide products and services for improving reservoir performance and increasing oil and gas recovery from new and existing fields.

• Reservoir Description: Encompasses the characterization of petroleum reservoir rock, fluid and gas samples. We provide analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry.

• Production Enhancement: Includes products and services relating to reservoir well completions, perforations, stimulations and production. We provide integrated services to

8

	evaluate the effectiveness of well completions and to develop solutions aimed at increasing the effectiveness of enhanced oil recovery projects.
•	Reservoir Management: Combines and integrates information from reservoir description and production enhancement services to increase production and improve recovery of oil and gas from our clients’ reservoirs.

Segment Analysis

     We manage our business segments separately due to the different technologies each segment utilizes and requires. Results of these segments are presented below using the same accounting policies as used to prepare the Consolidated Balance Sheets and Statements of Operations. We evaluate performance based on income or loss from operations before income tax, interest and other non-operating income (expense). Summarized financial information concerning our segments is shown in the following table (in thousands):

		Three months ended June 30,						Six months ended June 30,
		2002			2001			2002			2001
		(Unaudited)						(Unaudited)
		(Restated) Note 9						(Restated) Note 9
Revenues:
Reservoir Description		$	54,282		$	52,123		$	103,761		$	100,289
Production Enhancement			21,103			26,163			44,505			52,922
Reservoir Management			11,066			12,974			22,468			29,395
	Consolidated	$	86,451		$	91,260		$	170,734		$	182,606
Income (Loss) Before Interest Expense and Income Tax Expense:
Reservoir Description		$	6,180		$	8,260		$	9,894		$	14,376
Production Enhancement			(61	)		4,795			493			8,572
Reservoir Management			(1,138	)		(314	)		(2,590	)		311
Corporate and Other1			(882	)		17			(1,319	)		(31	)
	Consolidated	$	4,099		$	12,758		$	6,478		$	23,228

1) “Corporate and Other” represents non-operational charges.

9

7. EARNINGS PER SHARE

     We present earnings per share in accordance with SFAS No. 128, “Earnings per Share” which requires dual presentation of both basic and diluted earnings per share on the Consolidated Statement of Operations. Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted earnings per share reflects the net additional shares which would be issued if all dilutive stock options outstanding were exercised.

     The following table summarizes the calculation of weighted average common shares outstanding used in the computation of earnings per share:

	Three Months Ended June 30,				Six Months Ended June 30,
	2002		2001		2002		2001
	(Unaudited)
Weighted average basic common shares outstanding		33,245,618		33,044,424		33,227,805		32,965,168
Effect of dilutive stock options1		619,883		1,147,938		—		1,158,485
Weighted average diluted common shares outstanding		33,865,501		34,192,362		33,227,805		34,123,653

1) Options totaling 1,871,051 and 41,801 equivalent common shares for the three months ended June 30, 2002 and 2001, and 2,428,868 and 41,801 for the six months ended June 30, 2002 and 2001, respectively, were not included in the computation of weighted average diluted common shares because the impact of these options was anti-dilutive.

8. SUBSEQUENT EVENT

     On July 1, 2002, we acquired certain assets of Advanced Data Solutions (“ADS”) for approximately $8.0 million. The transaction resulted in an increase in goodwill of approximately $5.7 million. In accordance with SFAS 142, goodwill relating to this purchase will not be amortized. In the event certain contingent goals are achieved at year-end 2002, additional consideration in an amount up to $8.0 million may be due.

9. RESTATEMENT OF FINANCIALS

     We have restated our previously reported Consolidated Balance Sheet as of June 30, 2002 and our Consolidated Statement of Operations and Consolidated Statement of Cash Flows for the three and six months ended June 30, 2002. In connection with our year-end audit, we determined that certain items of revenues and expenses had been accounted for in the incorrect quarter. The following table summarizes the impact and explanation of the adjustments on our previously reported quarterly results (in thousands, except per share data):

10

	Three Months Ended					Six Months Ended
	June 30, 2002					June 30, 2002
	Previously					Previously
	Reported		Restated			Reported			Restated
	(Unaudited)
Service and sales revenues	$	87,464	$	86,451	a	$	172,528		$	170,734	a
Cost of services and sales		70,417		71,606	b,c		139,355			142,590	b,c
Other operating expenses		10,095		10,746	d,e,f		20,070			21,666	d,e,f
Operating income		6,952		4,099			13,103			6,478
Interest expense		1,920		1,927			3,888			3,903
Income before income tax expense		5,032		2,172			9,215			2,575
Income tax expense		1,409		912	g		2,580			1,081	g
Income before cumulative effect of change in accounting principle		3,623		1,260			6,635			1,494
Cumulative effect of change in accounting principle		—		—			(16,692	)		(16,692	)
Net income (loss)	$	3,623	$	1,260		$	(10,057	)	$	(15,198	)
Per share data:
Basic earnings (loss) per share	$	0.11	$	0.04		$	(0.30	)	$	(0.46	)
Weighted average basic common shares outstanding		33,246		33,246			33,228			33,228
Diluted earnings (loss) per share	$	0.11	$	0.04		$	(0.30	)	$	(0.46	)
Weighted average diluted common shares outstanding		33,866		33,866			33,228			33,228

a.	Adjusts revenues by $1,013 and $1,794 for the three and six months ended June 30, 2002, respectively, as a result of untimely processing of credit memos.
b.	Record additional provision for doubtful accounts of $1,127 and $2,689 for the three and six months ended June 30, 2002, respectively, based on the Company’s historical experience.
c.	Adjustment for cost of sales of $62 and $546 for the three and six months ended June 30, 2002, respectively, as a result of reconciliation of account balances primarily in Mexico and Venezuela.
d.	Record adjustment for expense of $172 and $345 for the three and six months ended June 30, 2002, respectively, to correct depreciation expense based on estimated useful life of related assets.
e.	Additional general and administrative expense of $130 and $193 for the three and six months ended June 30, 2002 primarily for compensation expense.
f.	Additional expense of $349 and $1,058 for the three and six months ended June 30, 2002, respectively, for correction of foreign exchange adjustments in Venezuela.
g.	Income tax effect of all adjustments above.

     The following table summarizes the impact of these adjustments on our previously reported quarterly financial position (in thousands):

	June 30, 2002
	Previously
Consolidated Balance Sheets	Reported		Restated
	(Unaudited)
Cash	$	17,535	$	16,964
Accounts receivable	$	88,030	$	83,637
Inventories	$	39,364	$	39,106
Prepaid expenses and other current assets	$	13,380	$	12,841
Property, plant and equipment, net	$	97,620	$	97,579
Intangibles, goodwill and other assets	$	143,737	$	143,608
Accounts payable	$	15,339	$	15,601
Other current liabilities and minority interest	$	16,691	$	15,866
Other liabilities	$	22,195	$	21,969
Retained earnings	$	78,252	$	73,111

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CORE LABORATORIES N.V.
MANAGEMENT’S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS

     General

     This discussion includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. We have based the forward-looking statements relating to our operations on our current expectations, estimates and projections. We caution you that these statements are not guarantees of future performance and involve risks and uncertainties that we cannot predict. In addition, we have based many of these forward-looking statements on assumptions about future events that may prove to be inaccurate. Accordingly, our actual outcomes and results may differ materially from what we have expressed or forecast in the forward-looking statements. Our forward-looking statements are based on assumptions that we believe to be reasonable but that may not prove to be accurate. All of our forward-looking information is, therefore, subject to risks and uncertainties that could cause actual results to differ materially from the results expected. Although it is not possible to identify all factors, these risks and uncertainties include the risk factors discussed below.

     Industry risks

     The oil and gas industry is highly cyclical and there are numerous factors affecting the supply of and demand for oil and natural gas, which include:

• market prices of oil and gas;

• cost of producing oil and natural gas;

• the level of drilling and production activity;

• mergers, consolidations and downsizing among our clients;

• coordination by the OPEC; and

• the impact of commodity prices on the expenditure levels of our customers.

     Business risks

     Our results of operations could be adversely affected by risks and uncertainties in the business environment in which we operate, including:

• competition in our markets;

• the realization of anticipated synergies from acquired businesses and future acquisitions;

• our ability to continue to develop or acquire new and useful technology; and

• interest rates and the cost of capital.

     International risks

     We conduct our business in over 50 countries and are subject to political and economic instability and the laws and regulations in the countries in which we operate. These include:

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• global economic conditions;

• political actions and requirements of national governments including trade restrictions and embargos and expropriations of assets;

• potential income tax liabilities in multiple jurisdictions;

• civil unrest;

• fluctuations and changes in currency exchange rates; and

• the impact of inflation.

     Other risks

     The events of September 11, the economic downturn and political, corporate and credit events that followed and continue to unfold could result in lower demand for our products and services. Our client base could be impacted by events we cannot predict or we could be impacted by a change in the conduct of business, transportation and security measures. In addition, we are subject to other risk factors such as the impact of environmental regulations and litigation risks, as well as the dependence on the oil and gas industry. Many of these risks are beyond our control. In addition, future trends for pricing, margins, revenues and profitability remain difficult to predict in the industries we serve and under current economic and political conditions. We do not feel obligated to publicly update any of our forward-looking statements.

     Our operations are subject to various risks and other factors including, but not limited to:

• our ability to continue to develop or acquire new and useful technology;

• the realization of anticipated synergies from acquired businesses and future acquisitions;

• our dependence on the oil and gas industry, and the impact of commodity prices on the expenditure levels of our customers;

• competition in our markets; and

• the risks and uncertainties attendant to adverse industry, political, economic and financial market conditions, including stock prices, government regulations, interest rates and credit availability.

     Core Laboratories was established in 1936 and is one of the world’s leading providers of proprietary and patented reservoir description, production enhancement and reservoir management services to the oil and gas industry. These services are directed toward enabling our clients to improve reservoir performance and increase oil and gas recovery from their producing fields. We have over 70 offices in more than 50 countries and have approximately 4,200 employees.

Results of Operations

     We have restated our previously reported Consolidated Balance Sheet as of June 30, 2002 and our Consolidated Statement of Operations and Consolidated Statement of Cash Flows for the three and six months ended June 30, 2002. In connection with our year-end audit, we determined that certain items of revenues and expenses had been accounted for in the incorrect quarter. For additional information about restatements, see Note 9 of the Notes to Consolidated Financial Statements.

     Service revenues for the second quarter of 2002 decreased $1.4 million, or 2% from the same period last year, primarily due to decreased worldwide oilfield activities. Service revenues for the six

13

month period ended June 30, 2002 decreased $5.8 million a 4% decrease from the same period last year.

     Cost of services expressed as a percentage of service revenue were 81% and 77% in the second quarter of 2002 and the same period last year, respectively, and 82% and 77% in the six month period ended June 30, 2002 and in the same period last year, respectively. Our relatively fixed cost structure for our services caused our cost of services, in relation to revenues, to rise in 2002 compared to the same time period in the prior year.

     Sales revenues decreased to $13.8 million in the second quarter of 2002 from $17.2 million in the second quarter of 2001, a 20% decrease. Sales revenue for the six month period ended June 30, 2002 decreased $6.1 million to $28.9 million from $35.0 million in the same period in 2001, an 17% decrease. These decreases were caused, in most part, to the deep decline in drilling for natural gas in the North American markets. Consequently, there was lower demand for our well completion products.

     Cost of sales in the second quarter of 2002 was 92% of sales revenue as compared to 76% for the same period last year. For the six month period ended June 30, 2002, cost of sales was 92% as compared to 80% in the prior year. Our actual cost of sales have decreased year over year, due in part to our efforts to reduce costs. However, the reduction is not evidenced in our margin due to the reduction in our sales revenue in 2002.

     General and administrative expenses are comprised of corporate management and centralized administrative services which benefit our operating subsidiaries. Although general and administrative expenses are generally more fixed in nature as a percentage of revenues, we did experience an increase of $1.1 million and $2.3 million for the three and six month periods ended June 30, 2002, respectively, as compared to the corresponding periods in 2001. These increases were largely attributable to growth in the number of people necessary to support increases in the scope of our operations as well as an increase in our direct marketing effort focused on providing integrated solutions to our clients as well as continuing the implementation of the company-wide financial system.

     Depreciation and amortization expense for the second quarter of 2002 increased $0.4 million and $1.0 million for the three and six month periods ended June 30, 2002, as compared to the corresponding periods in 2001. These increases were due to additional capital investments, which include additions to the Houston facility.

     As a result of adoption of SFAS 142 beginning January 1, 2002, we no longer amortize goodwill but will test for impairment annually or more frequently if circumstances indicate a potential impairment. Under the requirements, in the first quarter we reflected impairment of goodwill of approximately $16.7 million related to our Reservoir Management segment. This impairment is reflected in the consolidated statement of operations as a cumulative effect of change in accounting principle. The cessation of goodwill amortization under the guidelines resulted in a reduction in operating expenses of approximately $1.0 million and $2.1 million for the three and six month periods ended June 30, 2002, respectively, and will result in a reduction of approximately $4.2 million in annual operating expenses, assuming no additional impairment of goodwill.

     The 2002 effective income tax rate increased to 42% of income before cumulative effect of change in accounting principle from the 2001 rate of 28%. This increase is the result of an increase in

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expenses that are not deductible for tax purposes and an increased valuation allowance on Venezuela deferred tax assets.

     During the fourth quarter of 2001, we had several transactions which impacted certain operations that were not viewed as ongoing. We restructured certain operations in Mexico, the United Kingdom, the U.S. and other countries to improve operating efficiencies. This restructuring expense included write-offs of assets and leasehold improvements and an accrual for facility restoration, severance benefits and lease termination costs. Approximately 100 field employees were terminated. In the second quarter of 2002, we relocated a facility from Mexico City, Mexico to Villahermosa, Mexico and we intend to relocate one of our operations from Dallas to the Houston Advanced Technology Center in the second half of 2002. This charge of approximately $3.0 million affected each of our operating segments as follows: Reservoir Description - $0.8 million; Production Enhancement – $0.1 million; Reservoir Management - $2.1 million. Substantially all employee terminations were completed by the end of the first quarter of 2002. Total cash required for this restructuring charge of $2.1 million will be funded from operating activities. Cash required for the costs incurred through June 30, 2002 was $1.3 million. This charge is summarized in the following table:

Restructuring Charges
(in thousands)

	Lease						Asset
	Obligations		Severance		Restoration		Write-offs1		Other		Total
Total restructuring charges	$	598	$	951	$	380	$	862	$	184	$	2,975
Less: Costs incurred through December 31, 2001		38		394		—		862		40		1,334
Accrual remaining at December 31, 2001		560		557		380		—		144		1,641
Less: Costs incurred through June 30, 2002 (Unaudited)		78		557		230		—		6		871
Accrual remaining at June 30, 2002 (Unaudited)	$	482	$	—	$	150	$	—	$	138	$	770

1) The fixed assets and leasehold improvements were disposed of by the end of December 2001. The write-off approximates the carrying amount as these assets were abandoned or sold for salvage value. Depreciation expense was reduced by approximately $20 in 2001 and will be reduced by $82 in 2002 and $281 thereafter. The asset write-offs of $862 were attributable to the Reservoir Management segment.

Segment Analysis
(in thousands)

		Three months ended June 30,						Six months ended June 30,
		2002			2001			2002			2001
		(Unaudited)							(Unaudited)
			(Restated)						(Restated)
Revenues:
Reservoir Description		$	54,282		$	52,123		$	103,761		$	100,289
Production Enhancement			21,103			26,163			44,505			52,922
Reservoir Management			11,066			12,974			22,468			29,395
	Consolidated	$	86,451		$	91,260		$	170,734		$	182,606
Income (Loss) Before Interest Expense and Income Tax Expense:
Reservoir Description		$	6,180		$	8,260		$	9,894		$	14,376
Production Enhancement			(61	)		4,795			493			8,572
Reservoir Management			(1,138	)		(314	)		(2,590	)		311
Corporate and Other1			(882	)		17			(1,319	)		(31	)
	Consolidated	$	4,099		$	12,758		$	6,478		$	23,228

1) “Corporate and Other” represents non-operational charges.

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Reservoir Description

     Revenues from the Reservoir Description segment increased $2.2 million in the second quarter of 2002 compared to the same period in the prior year. Revenues for the six month period ended June 30, 2002 increased $3.5 million. Increased international demand for our existing services and deepwater services, as well as the introduction of new technologies into international arenas bolstered revenue in this segment. Earnings before interest and taxes decreased by $2.1 million in the second quarter of 2002 and $4.5 million in the six month period ended June 30, 2002, compared to the same periods in the prior year due to decreased margins relating primarily to slowness in the activity levels in the North American natural gas markets.

Production Enhancement

     Revenues from the Production Enhancement segment were $21.1 million in the second quarter of 2002 compared to $26.2 million in the same period in the prior year, a decrease of 19%. For the six month period ended June 30, 2002, revenues decreased $8.4 million to $44.5 million, a decrease of 16% from the same period in the prior year. Due to lower industry activity levels, we continued to experience decreased demand for our well completion and stimulation technologies, primarily in North American markets in the second quarter. Earnings before interest and taxes decreased $4.9 million in the second quarter and $8.1 million in the six month period ended June 30, 2002 compared to the same periods in 2001.

Reservoir Management

     Revenues from the Reservoir Management segment in the second quarter of 2002 were $11.1 million, a decrease of $1.9 million compared to the same period in the prior year, while revenues for the six month period ended June 30, 2002 decreased $6.9 million compared to the same period in 2001. As part of our refocus effort in this group, we have elected to no longer bid on projects that could earn lower than acceptable margins. Consequently, our revenues have decreased; however, our earnings have improved. Further, we have been able to significantly reduce our cost structure in this unit after taking the restructuring charge in the fourth quarter of 2001.

Liquidity and Capital Resources

     We have historically financed our activities through cash flows from operations, bank credit facilities, equity financing and the issuance of debt.

     For the six month period ended June 30, 2002, cash flows from operating activities were $19.0 million, an increase of $6.0 million from the same period in 2001. At June 30, 2002, we had working capital of $130.7 million and a current ratio of 5.2 to 1.0, compared to working capital of $139.3 million and a current ratio of 4.5 to 1.0 at December 31, 2001. We are a Netherlands holding company and we conduct substantially all of our operations through subsidiaries. Consequently, our

16

cash flow is dependent upon the ability of our subsidiaries to pay cash dividends or otherwise distribute or advance funds to us.

     For the six month period ended June 30, 2002, our investing activities used $10.6 million compared to $13.7 million in the same period in 2001 due to a reduction in our capital expenditure program. Included in the capital expenditures is a new lab and office facility in Moscow, Russia. For the six month period ended June 30, 2002 our financing activities used $5.9 million and provided $3.3 million in the same period in 2001. The use of cash in 2002 financing activities was due to a net reduction of approximately $6.4 million in the Credit Facility.

     Our ability to maintain and grow our operating income and cash flows is dependent upon continued investing activities. We believe our future cash flows from operations, supplemented by our borrowing capacity and issuances of additional equity should be sufficient to fund debt requirements, capital expenditures, working capital and future acquisitions.

17

CORE LABORATORIES N.V.
QUANTITATIVE AND QUALITATIVE DISCLOSURES OF MARKET RISK

Market Risk

     We are exposed to market risk, which is the potential loss arising from adverse changes in market prices and rates. We do not enter, or intend to enter, into derivative financial instruments for trading or speculative purposes. We do not believe that our exposure to market risks, which are primarily related to interest rate changes and fluctuations in foreign exchange rates, are material. During 1999, we issued fixed rate Senior Notes denominated in U.S. dollars. The proceeds were used to pay off variable rate term loans. This significantly reduced our exposure to market risk. This section should be read in conjunction with “Note 4 — Long-Term Debt” of the Notes to Consolidated Financial Statements.

Interest Rate Risk

     We are exposed to interest rate risk on our Credit Facility debt that carries a variable interest rate. At June 30, 2002, our variable rate debt outstanding of $14.0 million approximated its fair value. A one percent change in the interest rate would not cause a material change in interest expense on an annual basis. We attempt to balance the benefit of variable rate debt that has inherent increased risk with fixed rate debt that has less market risk.

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CORE LABORATORIES N.V.
PART II — OTHER INFORMATION

Item 1. Legal Proceedings.

     We are from time to time subject to legal proceedings and claims that arise in the ordinary course of business. We believe that the outcome of current legal actions will not have a material adverse effect upon our consolidated financial position or results of operations.

Item 2. Changes in Securities.

     None

Item 3. Defaults Upon Senior Securities.

     None

Item 4. Submission of Matters to a Vote of Security Holders.

     Stockholders voting at the Annual Meeting on May 30, 2002 and by proxy, elected eight members (each, a “Supervisory Director”) to the Board of Supervisory Directors of the Company (the “Supervisory Board”), consisting of (i) David M. Demshur, (ii) Rene R. Joyce; (iii) Jacobus Schouten, as Class I Supervisory Directors, (i) D. John Ogren, (ii) Joseph R. Perna, (iii) Timothy J. Probert as Class II Supervisory Directors and (i) Richard L. Bergmark, (ii) Alexander Vriesendorp, to serve until the annual meeting of shareholders in 2005, 2004 and 2003, respectively, and until their successors shall have been duly elected and qualified.

     The vote tabulation for the individual Supervisory Directors was as follows:

Director	Shares for		Shares Withheld
David M. Demshur		20,607,680		34,212
Rene R. Joyce		20,607,680		34,212
Timothy J. Probert		20,607,680		34,212
Jacobus Schouten		20,607,680		34,212
D. John Ogren		20,607,680		34,212
Joseph R. Perna		20,607,680		34,212
Richard L. Bergmark		20,607,680		34,212
Alexander Vriesendorp		20,607,680		34,212

     Shareholders also confirmed the Dutch Statutory Annual Accounts for the year ended December 31, 2001. The proposal was approved by 20,608,275 votes for, 18,130 votes against, with 15,487 abstentions.

     Shareholders approved the extension of the authority of the Management Board of the Company to repurchase up to 10% of the outstanding share capital of the Company until November 29, 2003. The proposal was approved by 20,611,475 votes in favor, 16,452 votes against, with 13,965 abstentions.

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     Shareholders approved the extension of the authority of the Supervisory Board to issue and/or to grant rights (including options to purchase) of common and/or preferred shares of the Company until May 29, 2007. The proposal was approved by 20,023,751 votes in favor, 591,169 votes against, with 26,972 abstentions.

     Shareholders approved the extension of the authority of the Supervisory Board to limit or to exclude the preemptive right of holders of common shares of the Company until May 29, 2007. The proposal was approved by 18,091,463 votes in favor, 2,517,674 votes against, with 32,755 abstentions.

Item 5. Other Information.

     All references to the nominal value of EUR 0.01 (formerly NLG 0.03) of each share in the share capital of Core Laboratories N.V. is made with reference to article 2:67c of the Dutch Civil Code.

Item 6. Exhibits and Reports on Form 8-K.

     (a)  Exhibits

99.1	Certification by Chief Executive Officer
99.2	Certification by Chief Financial Officer

     (b)  Reports on Form 8-K

     None

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SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant, Core Laboratories N.V., has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

CORE LABORATORIES N.V.
by: Core Laboratories International B.V.

Dated: April 4, 2003 By: /s/ Richard L. Bergmark
Richard L. Bergmark
Chief Financial Officer

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CERTIFICATION

I, David M. Demshur, certify that:

1.     I have reviewed this quarterly report on Form 10-Q/A of Core Laboratories N.V.;

2.     Based on my knowledge, this quarterly 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 quarterly report;

3.     Based on my knowledge, the financial statements, and other financial information included in this quarterly 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 quarterly report;

4.     The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

a) designed such disclosure controls and procedures 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 quarterly report is being prepared;

b) evaluated the effectiveness of the registrant’s disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the “Evaluation Date”); and

c) presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;

5.     The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent function):

a) all significant deficiencies in the design or operation of internal controls which could adversely affect the registrant’s ability to record, process, summarize and report financial data and have identified for the registrant’s auditors any material weaknesses in internal controls; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls; and

6.     The registrant’s other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

Date: April 4, 2003
	By:	/s/ David M. Demshur David M. Demshur Chief Executive Officer

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I, Richard L. Bergmark, certify that:

1.     I have reviewed this quarterly report on Form 10-Q/A of Core Laboratories N.V.;

2.     Based on my knowledge, this quarterly 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 quarterly report;

3.     Based on my knowledge, the financial statements, and other financial information included in this quarterly 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 quarterly report;

4.     The registrant’s other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

a) designed such disclosure controls and procedures 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 quarterly report is being prepared;

b) evaluated the effectiveness of the registrant’s disclosure controls and procedures as of a date within 90 days prior to the filing date of this quarterly report (the “Evaluation Date”); and

c) presented in this quarterly report our conclusions about the effectiveness of the disclosure controls and procedures based on our evaluation as of the Evaluation Date;

5.     The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent function):

a) all significant deficiencies in the design or operation of internal controls which could adversely affect the registrant’s ability to record, process, summarize and report financial data and have identified for the registrant’s auditors any material weaknesses in internal controls; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal controls; and

6.     The registrant’s other certifying officers and I have indicated in this quarterly report whether or not there were significant changes in internal controls or in other factors that could significantly affect internal controls subsequent to the date of our most recent evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses.

Date: April 4, 2003
	By:	/s/ Richard L. Bergmark Richard L. Bergmark Chief Financial Officer

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