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November 19, 2010 Response of Patterson-UTI Energy, Inc. to 

September 9, 2010 Request of U.S. Environmental Protection Agency 

Narrative Responses 

These responses should be read in conjunction with those provided in the October 12, 2010 response of Patterson-UT

(“Patterson”). CBI? Question 

Number 

Response 

 1, 1(f) Universal Well Services, Inc. (“UWS”) also purchased sulfamic acid from Clearwater Engine

Sulfamic acid is a component of Formulation/Mixture #1. 

 3, 3(a), UWS is producing “Environmental Response Plan for Field Operations,” which governs UW

operations. EPA’s request seeks information about operations other than fracturing, including flowback 

fracturing) and drilling (which occurs before fracturing). Patterson has inquired of subsidiari

and drilling services for responsive information and documents about their operations. Flowback. Eastern Reservoir Services (“ERS”), a business division of UWS, provides post-fservices. UWS and ERS compete independently; their respective fracturing and flowback sefor sale to well operators. Each has its own offices, employees, and recordkeeping systems. knowledge, well operators rarely contract both UWS and ERS to work on the same well. ERS customers typically control every aspect of the flowback operation, including the rate anoccurs, and the length of time ERS provides flowback before gas is diverted to sales lines. Cresponsibility for managing the fluids flowed back from their wells. ERS does not provide stprocedures for managing flowback and produced waters. ERS typically does not need or reqanticipated flowback volumes. It does not provide standard operating procedures for determiof flowback and produced waters. In an effort to assist EPA in understanding its flowback operations, ERS is producing its field known as “Standard 3.” Every ERS crew member is trained on Standard 3, which describes 

requirements for ERS operations at customer well sites. 
November 19, 2010 Response of Patterson-UTI Energy, Inc. to September 9, 2010 Request of U.S. Environmental Pro

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Instruction I 

Drilling. Although EPA’s request was limited to Patterson and affiliated entities “that perfor

services,” Patterson made a reasonable inquiry of its subsidiary Patterson-UTI Drilling CompDrilling”), which provides drilling equipment and crew to well operators, but does not providservices. In the last five (5) years, Patterson Drilling has worked exclusively on a “daywork” basis for 

those drilling contracts, well operators pay Patterson Drilling on a “per day” basis to furnish 

an experienced crew to maintain and operate that equipment, under the direction, supervision

operator and its consultants. The well operator provides Patterson Drilling with a drilling prowith any drilling fluids and additives called for by that program. Many well operators retain consultant, who gives daily (or more frequent) instructions to the Patterson Drilling crew on to use. Patterson Drilling is not responsible for calculations relating to, or choice or composi

fluids/muds. ERS and Patterson Drilling provide customers with operational equipment and an experiencedrilling. Their procedures and training materials relate primarily to maintaining equipment aoperations. Well operators and/or their third party consultants may have information respons

3(a), because they retain responsibility for and otherwise control flowback and drilling operawell sites. 

4(a)(ii), Instruction I 

Patterson’s hydraulic fracturing subsidiaries, UWS and Universal Pressure Pumping, Inc. (“Ufracturing jobs by well, not by “site,” as that term is defined by EPA, and track each well by by street address, city, or geographic coordinates. UWS and UPP have identified the wells at which, and the customers for whom, they planned fracturing services as of November 12 and November 15, respectively. See Response to Que

which contains confidential business information. Typically, well operator customers schedu

basis, approximately two to four weeks in advance. Well operators may have more specific information on plans for future wells. 

4(b) UWS has identified the contractors it used during the period September 9, 2009 to Septembe
November 19, 2010 Response of Patterson-UTI Energy, Inc. to September 9, 2010 Request of U.S. Environmental Pro

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with its fracturing operations. See Response to Question 4(b) (attached), which contains conf

information. UWS may use those contractors for the fracturing jobs identified in response to 

 Instruction B UWS

William Stoner, Senior Vice President Mark Michaelis, Controller Gary Wells, Division Manager, UWS d/b/a Eastern Reservoir Services Michael Kloecker, Corporate Development Manager Pat Lander, EHS Specialist Rick Sloan, District Manager – Allen Joe Burchett, Sales Representative – Allen Derek Hina, Tech Manager / Sales Representative – Allen William Ruddock, District Manager – Bradford Tim Waugh, District Manager – Buckhannon Randy MacKinnon, District Manager – Connellsville Howard Smith, Operations Manager – Connellsville David Jeffers, Sales Representative – Lake City Smokey Rowland, District Manager – Lake City Dean Rogers, District Manager – Meadville Tom Larko, District Manager – Punxsutawney Chuck Cole, District Manager – Williamsport Rick Carter, District Manager – Wooster Matt Teichmer, Operations Manager – Wooster Patterson Drilling

Michael Holcomb, Senior Vice President – Operations UPPJohn Carnett, Vice President Carlos Cruz, District Manager – North Texas Jimmy Loven, District Manager – South Texas Bobby Tubbs, District Manager – Midland