Citi 2016 Global Energy & Utilities Conference May 10, 2016 Exhibit 99.1

Forward Looking Statements This material and any oral statements made in connection with this material include "forward-looking statements" within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934. Statements made which provide the Company’s or management’s intentions, beliefs, expectations or predictions for the future are forward-looking statements and are inherently uncertain. The opinions, forecasts, projections or other statements other than statements of historical fact, including, without limitation, plans and objectives of management of the Company are forward-looking statements. It is important to note that actual results could differ materially from those discussed in such forward-looking statements. Important factors that could cause actual results to differ materially include the risk factors and other cautionary statements contained from time to time in the Company’s SEC filings, which may be obtained by contacting the Company or the SEC. These filings are also available through the Company’s web site at http://www.patenergy.com or through the SEC’s Electronic Data Gathering and Analysis Retrieval System (EDGAR) at http://www.sec.gov. We undertake no obligation to publicly update or revise any forward-looking statement. Statements made in this presentation include non-GAAP financial measures. The required reconciliation to GAAP financial measures are included on our website and/or at the end of this presentation. The Red Circular Rig Logo, the Universal Logo, and the terms PATTERSON UTI, and APEX are registered trademarks of Patterson–UTI Energy, Inc.

Scaling The Business Scaling our business effectively is key to our success… …both in upturns and downturns Patterson-UTI U.S. rig count and U.S. drilling staff size through April 29, 2016

High Quality Drilling Rigs 161 APEX® Rigs

Modern Pumping Equipment Modern triplex pumps defined as being placed in service within the last seven years.

Strong Financial Position 25% Debt/ Total Cap Stockholder’s Equity 4.97% Series A notes Due October 5, 2020 4.27% Series B notes Due June 14, 2022 Bank Term Loans Maturing September 27, 2017 * Debt and equity balances as of March 31, 2016. Total debt balance of $845 million includes $3.5 million of debt issuance costs. The $245 million of bank term loans includes quarterly principal payments totaling $54 million during the remainder of 2016. Principal payments in 2017 include two quarterly payments totaling $47 million and payments at the maturity date of $144 million.

Why Invest in Patterson-UTI Energy? High Quality Assets 161 APEX® rigs comprised primarily of 1500 horsepower and pad capable rigs Creating value through focus on well site execution Technology leader Leader in walking rigs for pad drilling Innovator in deploying latest technologies for pressure pumping Financially flexible Strong balance sheet History of share buybacks Dividends Scalable business structure

Citi 2016 Global Energy & Utilities Conference May 10, 2016

Additional References

Contract Drilling High quality fleet of land drilling rigs including 161 APEX® rigs Leader in walking rig technology for pad drilling applications Large footprint across North American drilling markets Patterson-UTI reported results for the three months ended March 31, 2016

Pressure Pumping High quality fleet of modern pressure pumping equipment Strong reputation for regional knowledge and efficient operations Concentrated footprint provides economies of scale Patterson-UTI reported results for the three months ended March 31, 2016

Managing Supply Chain Sourcing and Supply Security Negotiated critical cost elements for both Drilling and Pressure Pumping Solidified availability of strategic commodities Reduced Costs in 2015 Sand costs down 25% - 35% Sand hauling costs down 25% - 35% Pump parts costs down 15% - 20% Chemical costs down as much as 40%

Contract Drilling

Majority of Adjusted EBITDA from APEX® Rigs *Adjusted EBITDA contribution by rig class excluding early termination revenues for the three months ended March 31, 2016.

The APEX-XK® Enhanced X-Y mobility Walk with full set-back of pipe in mast More efficient rig up / rig down Walking times average 45 minutes for 10’ – 15’ well spacing Advanced environmental spill control integrated into drilling floor Reduced number of truck loads for rig moves 53 APEX-XK 1500® and four APEX-XK 1000 ® rigs in fleet http://patenergy.com/drilling/technology

APEX-XK® Integrated Walking System

APEX-XK® Rig Walking on Pad http://patenergy.com/drilling/technology/apexwalk/ Video of APEX-XK® Rig

West Texas 11 Rigs Large Geographic Footprint PTEN’s Active Rig Count by Region as of May 6, 2016 Appalachia 18 Rigs East Texas 5 Rigs Mid-Continent 5 Rigs Rockies 3 Rigs South Texas 4 Rigs North Dakota 6 Rigs Canada 0 Rigs http://patenergy.com/

Pressure Pumping

Modern Pumping Equipment

Southwest Region: Northeast Region: Fracturing horsepower: 663,800 Other horsepower: 32,165 Fracturing horsepower: 353,800 Other horsepower: 55,400 Market Concentration Provides Economies of Scale Pressure Pumping Areas Horsepower distribution as of March 31, 2016

Technology Focused PropLogic™ Sand Management System Fully enclosed well-site sand management system More accurate than conventional sand trailers/bins More efficient use of proppant as less sand is wasted

Technology Focused PowderStim® Dry Friction Reducer System hydrates powder form of friction reducer directly into the fluid stream Logistically safer and more efficient compared to liquefied friction reducers Successful with both fresh water and heavy brines More cost effective by utilizing produced water

Technology Focused Comprehensive Lab Services Ability to test vendors’ chemicals enhances quality controls Unique in-house friction flow loop test assembly for faster test results In-house lab services are faster and more cost efficient than outsourcing

Strong Financial Position

Investing in Our Company Capital Expenditures and Acquisitions ($ in millions) 2016 Capital expenditure forecast as of April 28, 2016

Total Liquidity $187 million cash $500 million revolver availability Of $845 million debt $245 million matures September 2017 $300 million matures October 2020 $300 million matures June 2022 * Debt and equity balances as of March 31, 2016. Total debt balance of $845 million includes $3.5 million of debt issuance costs. The $245 million of bank term loans includes quarterly principal payments totaling $54 million during the remainder of 2016. Principal payments in 2017 include two quarterly payments totaling $47 million and payments at the maturity date of $144 million.

PATTERSON-UTI ENERGY, INC. Non-GAAP Financial Measures (Unaudited) (dollars in thousands) Non-GAAP Financial Measures Three Months Ended March 31, Three Months Ended December 31, 2016 2015 2015 Adjusted Earnings Before Interest, Taxes, Depreciation and Amortization (Adjusted EBITDA )(1 ): Net income (loss) $ ( 70 , 503 ) $ 9 , 125 $ ( 58 , 658 ) Income tax expense (benefit) ( 35 , 430 ) 6 , 720 ( 27 , 511 ) Net interest expense 10 , 690 8 , 258 9 , 391 Depreciation, depletion, amortization and impairment 176 , 770 175 , 382 175 , 302 Impairment of goodwill - - - Adjusted EBITDA $ 81 , 527 $ 199 , 485 $ 98 , 524 Total revenue $ 268 , 939 $ 657 , 699 $ 338 , 566 Adjusted EBITDA margin (Adjusted EBITDA / Total Revenue) 30.3% 30.3% 29.1% Adjusted EBITDA by operating segment: Contract drilling $ 86 , 003 $ 187 , 230 $ 95 , 681 Pressure pumping 5 , 611 31 , 903 10 , 904 Oil and natural gas 1 , 877 3 , 702 1 , 184 Corporate and other ( 11 , 964 ) ( 23 , 350 ) ( 9 , 245 ) Consolidated Adjusted EBITDA $ 81 , 527 $ 199 , 485 $ 98 , 524 (1) The company makes use of financial measures that are not calculated in accordance with U.S. generally accepted accounting pri nci ples (“GAAP”) to help in the assessment of ongoing operating performance. These non - GAAP financial measures are reconciled to their most directly comparable GAAP measures in the tables above. We define Adjusted EBITDA as net income plus net interest expense, income tax expense and depreciation, depletion, amortization and impairment e xpe nse. We present Adjusted EBITDA because we believe it provides additional information with respect to both the performance of our fundamental business activities and ou r ability to meet our capital expenditures and working capital requirements. Adjusted EBITDA is not defined by GAAP and, as such, should not be construed as an alternative to net income (loss) or operating cash flow. We define margin as revenues less direct operating costs. We present margin because we believe it to be the component of our earni ngs most impacted by the variability in our contract drilling and pressure pumping operations. Margin is not defined by GAAP and, as such, should not be construed as an alt ernative to net income (loss).