| 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 | ||||
| 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 | ||||