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Enservco Corporation, through its subsidiaries, provides well enhancement and fluid management services to the onshore oil and natural gas industry. It offers hot oiling and acidizing, frac water heating, pressure testing, acidizing, and water hauling services, as well as well site construction services. The company owns and operates specialized trucks, trailers, frac tanks, and other well-site related equipment. It operates in the Eastern United States region comprising the southern region of the Marcellus Shale formation and the Utica Shale formation in eastern Ohio; Rocky Mountain region consisting of western Colorado and southern Wyoming, central Wyoming, western North Dakota, and eastern Montana; and the Central United States region, including Eagle Ford Shale and East Texas Oilfield in Texas. The company was incorporated in 1980 and is headquartered in Longmont, Colorado.

Key Energy Services, Inc. operates as an onshore rig-based well servicing contractor in the United States. It operates through Rig Services, Fishing and Rental Services, Coiled Tubing Services, and Fluid Management Services segments. The Rig Services segment is involved in the completion of newly drilled wells; workover and recompletion of existing oil and natural gas wells; well maintenance activities; and plugging and abandonment of wells at the end of their useful lives, as well as provision of specialty drilling services to oil and natural gas producers. The Fishing and Rental Services segment provides fishing services that involve recovering lost or stuck equipment in the wellbore utilizing fishing tools; and rents drill pipes, tubulars, handling tools, pressure-control equipment, pumps, power swivels, reversing units, and foam air units, as well as frac stack equipment to support hydraulic fracturing operations. The Coiled Tubing Services segment offers services for wellbore clean-outs, nitrogen jet lifts, through-tubing fishing, and formation stimulations; mills temporary isolation plugs that separate frac zones; and other pre-and post-hydraulic fracturing well preparation services. The Fluid Management Services segment offers transportation and well-site storage services for fluids utilized in drilling, completions, workover, and maintenance activities; and disposal services for fluids produced subsequent to well completion. It also operates a fleet of hot oilers for pumping heated fluids used to clear soluble restrictions in a wellbore. The company was formerly known as Key Energy Group, Inc. and changed its name to Key Energy Services, Inc. in December 1998. Key Energy Services, Inc. was founded in 1977 and is headquartered in Houston, Texas.

Nuverra Environmental Solutions, Inc. engages in the development and ongoing production of oil and natural gas from shale formations. It operates through the following segments: Rocky Mountain, Northeast, Southern, and Corporate and Other. The Rocky Mountain segment includes the Bakken shale area. The Northeast segment is comprised of the Marcellus and Utica shale areas. The Southern segment covers the Haynesville shale area. The Corporate and Other segment includes certain corporate costs and certain other corporate assets. The company was founded on May 29, 2007 and is headquartered in Houston, TX.

Willbros Group, Inc. is an independent contractor serving the oil, gasand power industries, providing construction, engineering and specialty services to industry and government entities worldwide. They place particular emphasis on projects in developing countries where they believe their experience gives them a competitive advantage.