EX-21.1 3 pten-ex211_7.htm EX-21.1

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 |  | British Columbia |
31.Warrior Rig Technologies US LLC |  | Delaware |
32.Western Wisconsin Sand Company, LLC |  | Wisconsin |