The following companies are subsidiares of Patterson-UTI Energy: Ambar Inc, Ambar Lone Star Fluid Services LLC, Current Power Solutions Inc., Drilling Technologies 1 LLC, Drilling Technologies 2 LLC, Great Plains Oilfield Rental L.L.C., High Valley Drilling, Jones Drilling, Keystone Rock & Excavation L.L.C., MS Directional LLC, Norton Drilling Services, PTL Prop Solutions L.L.C., Patterson Petroleum LLC, Patterson UTI International Saudi Arabia Limited, Patterson-UTI Drilling Canada Limited, Patterson-UTI Drilling Company LLC, Patterson-UTI Drilling International Inc., Patterson-UTI Holding Company LLC, Patterson-UTI International (Argentina) S.R.L., Patterson-UTI International (India) B.V., Patterson-UTI International (Kuwait) Limited, Patterson-UTI International (Netherlands) B.V., Patterson-UTI International Holdings (BVI) Limited, Patterson-UTI International Holdings (Netherlands) One B.V., Patterson-UTI International Holdings (Netherlands) Two B.V., Patterson-UTI International Holdings Inc., Patterson-UTI Management Services LLC, Seventy Seven Energy Inc., Seventy Seven Energy LLC, Seventy Seven Land Company LLC, Seventy Seven Operating LLC, Superior QC, Superior QC LLC, TMBR/ Sharp Drilling, Tejas Drilling Fluids, Universal Pressure Pumping Inc., Universal Wireline LLC, Warrior Rig Technologies, Warrior Rig Technologies Limited, Warrior Rig Technologies US LLC, Wek Drilling, and Western Wisconsin Sand Company LLC.
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