• Forbes Energy Capital Inc.
• Forbes Energy Services Ltd.
• Superior Tubing Testers, LLC
• Tx Energy Services, LLC
• Recon Technology Ltd.
• JetStar Energy Services, Inc.
• JetStar Holdings, Inc.
• Acid Services, LLC
• JS Acquisition LLC
• Xterra Fishing & Rental Tools Co.
• Wildhorse Services, Inc.
• Hennessey Rental Tools, Inc.
• Chaparral Service, Inc.
• Sledge Drilling Corp.
• CSI Compressco LP
• Willbros Group, Inc.\NEW\
• Superior Well Services, Ltd.
• SWSI Fluids, LLC
• Superior GP, L.L.C.
• Permian Plaza, LLC
• Allis-Chalmers Drilling LLC
• Gibson Energy ULC
• SemGroup Corp
• Archer Ltd
• Superior Holding, Inc.
• Platinum Energy Solutions, Inc.
• Frac Tech Services, Inc.
• C&J Old Co,Inc.
• InfrastruX Hawkeye Holdings, LLC
• B&H Maintenance & Construction, Inc.
• Bemis, LLC
• Chapman Construction Management Co., Inc.
• Chapman Holding Co., Inc.
• Premier West Coast Services, Inc.
• Construction & Turnaround Services, L.L.C.
• Halpin Line Construction LLC
• Hawkeye, LLC
• Willbros Utility T&D Group Common Paymaster, LLC
• Willbros Utility T&D Holdings, LLC
• InterCon Construction Trucking, Inc.
• InterCon Construction, Inc.
• InterPower Line Services Corp
• Lineal Industries, Inc.
• Premier Utility Services, LLC
• Skibeck Pipeline Company, Inc.
• Skibeck PLC, Inc.
• Trafford Corp
• UtilX Overseas Holdings, Inc.
• Willbros Construction (U.S.), LLC
• Willbros Construction California (U.S.), Inc.

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