NAME

STATE OF INCORPORATION

Bronco Oilfield Services, Inc.

Delaware

Chippewa Sand Company, LLC

Wisconsin

Cudd Pressure Control, Inc.

Delaware

Cudd Pumping Services, Inc.

Delaware

Cudd Energy Services Australia Pty Ltd

Australia

Cudd Energy Services Gabon SARL

Gabon

International Training Services, Inc.

Georgia

Patterson Services, Inc.

Delaware

Patterson Truck Line, Inc.

Louisiana

RPC Beijing

China

RPC Energy International, Inc.

Delaware

RPC Investment Company

Delaware

RPC Energy Services of Canada, Ltd

New Brunswick, Canada

RPC Energy de Mexico

Ciudad del Carmen, Mexico

RPC Waste Management Services, Inc.

Georgia

Sand Investment Company

Delaware

Thru Tubing Solutions

Delaware

Thru Tubing Solutions Australia Pty Ltd

Australia

Well Control School Australia Pty Ltd

Australia