Exhibit 21.1
Subsidiaries of the Registrant
Name |
| State of Incorporation or organization | |||
1.Ambar Lone Star Fluid Services LLC |
| Texas | |||
2.Current Power Solutions, Inc. |
| Texas | |||
3.Drilling Technologies 1 LLC |
| Delaware | |||
4.Drilling Technologies 2 LLC |
| Delaware | |||
5.Great Plains Oilfield Rental, L.L.C. |
| Oklahoma | |||
6.Keystone Rock & Excavation, L.L.C. |
| Oklahoma | |||
7.MS Directional, LLC |
| Texas | |||
8.Patterson Petroleum LLC |
| Texas | |||
9.Patterson UTI International Saudi Arabia Limited |
| Kingdom of Saudi Arabia | |||
10.Patterson-UTI Drilling Canada Limited |
| Nova Scotia | |||
11.Patterson-UTI Drilling Company LLC |
| Texas | |||
12.Patterson-UTI Drilling International, Inc. |
| Delaware | |||
13.Patterson-UTI International (Argentina) S.R.L. |
| Argentina | |||
14.Patterson-UTI International (Netherlands) B.V. |
| The Netherlands | |||
15.Patterson-UTI International Holdings (BVI) Limited |
| British Virgin Islands | |||
16.Patterson-UTI International Holdings (Netherlands) One B.V. |
| The Netherlands | |||
17.Patterson-UTI International Holdings (Netherlands) Two B.V. |
| The Netherlands | |||
18.Patterson-UTI International Holdings, Inc. |
| Delaware | |||
19.Patterson-UTI International (India) B.V. |
| The Netherlands | |||
20.Patterson-UTI International (Kuwait) Limited |
| British Virgin Islands | |||
21.Patterson-UTI Holding Company LLC |
| Delaware | |||
22.Patterson-UTI Management Services, LLC |
| Delaware | |||
23.PTL Prop Solutions, L.L.C. |
| Oklahoma | |||
24.Seventy Seven Energy LLC |
| Delaware | |||
25.Seventy Seven Land Company LLC |
| Oklahoma | |||
26.Seventy Seven Operating LLC |
| Oklahoma | |||
27.Superior QC, LLC |
| Delaware | |||
28.Universal Pressure Pumping, Inc. |
| Delaware | |||
29.Universal Wireline LLC |
| Delaware | |||
30.Warrior Rig Technologies Limited |
| Alberta | |||
31.Warrior Rig Technologies US LLC |
| Delaware | |||
32.Western Wisconsin Sand Company, LLC |
| Wisconsin | |||
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