EX-21.1 6 ex211subsidiariesoftheregi.htm EX-21.1

Exhibit 21.1

Subsidiaries of the Registrant
Entity			State/Country
Ambar Lone Star Fluid Services LLC			Texas
Black Gold Oilfield Services			Ecuador
BEP Ulterra Holdings, Inc.			Delaware
BEP Ulterra Intermediate Holdings, Inc.			Delaware
Current Power Solutions, Inc.			Texas
Drilling Technologies 1 LLC			Delaware
Drilling Technologies 2 LLC			Delaware
ESP Completion Technologies, LLC			Texas
ESP Completion Technologies SA			Panama
Great Plains Oilfield Rental, L.L.C.			Oklahoma
Keane Group Holdings, LLC			Delaware
Keane International Holdings, LLC			Delaware
Keystone Rock & Excavation, L.L.C.			Oklahoma
KGH Intermediate Holdco I, LLC			Delaware
KGH Intermediate Holdco II, LLC			Delaware
Mobile Data Technologies Ltd.			Alberta, Canada
MS Directional, LLC			Texas
NexTier Completion Solutions Inc.			Delaware
NexTier Holding Co.			Delaware
NexTier Integrated Services LLC			Delaware
NexTier International LLC			Delaware
NexTier Oilfield Solutions LLC			Delaware
Patterson Petroleum LLC			Texas
Patterson-UTI Drilling Canada Limited			Nova Scotia, Canada
Patterson-UTI Drilling Company LLC			Texas
Patterson-UTI Drilling International, Inc.			Delaware
Patterson-UTI Holding Company LLC			Delaware
Patterson-UTI International (Argentina) S.R.L.			Argentina
Patterson-UTI International (Colombia) Ltda. S. de R.L.			Panama
Patterson - UTI International (Colombia) Ltda. S. de R.L. Sucursal Colombia			Colombia
Patterson-UTI International (Ecuador) S.A.S.			Ecuador
Patterson-UTI International Holdings (BVI) Limited			British Virgin Islands
Patterson-UTI International Holdings, Inc			Delaware
Patterson-UTI International (Kuwait) Limited			British Virgin Islands
Patterson-UTI International Resources LLC			Delaware
Patterson-UTI TW Holdings LLC			Delaware
Patterson-UTI TW Services LLC			Delaware

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Patterson-UTI Management Services, LLC			Delaware
Penny Global Leasing Sarl			Luxembourg
Pioneer Coiled Tubing Services, LLC			Delaware
Pioneer Drilling Services, LLC			Texas
Pioneer Energy Services LLC			Delaware
Pioneer Fishing & Rental Services, LLC			Delaware
Pioneer Global Holdings, Inc.			Delaware
Pioneer Latina Group SDAD, Ltda.			Panama
Pioneer Production Services, Inc.			Delaware
Pioneer Services Holdings, LLC			Delaware
Proveedora Internacional de Taladros S.A.S			Colombia
Seventy Seven Energy LLC			Delaware
Seventy Seven Land Company LLC			Oklahoma
Seventy Seven Operating LLC			Oklahoma
Superior QC, LLC			Delaware
Texair Aviation LLC			Delaware
UDT GP, LLC			Delaware
Ulterra Arabia LLC (Joint Venture)			Saudi Arabia
Ulterra Australia Pty Ltd			Australia
Ulterra Canada ULC			Alberta, Canada
Ulterra Drilling Europe LTD			United Kingdom
Ulterra Drilling Technologies Brazil LTDA			Brazil
Ulterra Drilling Technologies, L.P.			Texas
Ulterra Drilling Technologies, L.P. (Iraq Branch)			Iraq
Ulterra Drilling Technologies, S.R.L.			Argentina
Ulterra International S.A.			Ecuador
Ulterra International Subsidiaries, LLC			Texas
Ulterra GEC Ltd.			Cayman Islands
Ulterra GP Ltd.			Alberta, Canada
Ulterra Holdings, Inc.			Delaware
Ulterra Latin America LLC			Texas
Ulterra Latin America LLC (Colombia Branch)			Colombia
Ulterra, LP			Alberta, Canada
Ulterra Middle East LLC			Texas
Ulterra Muscat LLC			Oman
Ulterra Parent LLC			Delaware
Ulterra, S. de R.L. de C.V.			Mexico
Ulterra Ukraine LLC			Ukraine
Utechnology Services México S de RL de CV			Mexico
Warrior Rig Technologies Limited			British Columbia, Canada
Warrior Rig Technologies US LLC			Delaware