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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.

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.

Recon Technology, Ltd. provides hardware, software, and on-site services to companies in the petroleum mining and extraction industry in the People's Republic of China. The company offers equipment, tools, and other components and parts related to oilfield production and other energy industries; and develops and sells industrial automation control and information solutions. It also provides equipment for oil and gas production and transportation, including heating furnaces and burner, as well as improvement techniques comprising packers of fracturing; production packers; sand prevention in oil and water wells; water locating and plugging techniques; fissure shaper; fracture acidizing techniques; and electronic broken-down services to resolve block-up and freezing problems. In addition, the company offers automation systems and services, including pumping unit controller that monitors the pumping units and collects data; RTU to monitor natural gas wells and collect gas well pressure data; wireless dynamometers and wireless pressure gauges; electric multi-way valves for oilfield metering station flow control; and natural gas flow computer systems. Further, it provides Recon SCADA oilfield monitor and data acquisition system for supervision and data collection; EPC service of pipeline SCADA system for pipeline monitoring and data acquisition; EPC service of oil and gas wells SCADA system for monitoring and data acquisition of oil wells and natural gas wells; EPC service of oilfield video surveillance and control system to control the oil and gas wellhead and measurement station areas; and technique service for digital oilfield transformation. Additionally, the company offers oilfield waste water treatment solutions and related chemicals; oily sludge disposal solutions; and gas station operation and management solution. Recon Technology, Ltd. was incorporated in 2007 and is headquartered in Beijing, the People's Republic of China.

Superior Energy Services, Inc. engages in the provision of oilfield services and equipment. It operates through the following segments: Drilling Products & Services, Onshore Completion & Workover Services, Production Services and Technical Solutions. The Drilling Products and Services segment provides downhole drilling tools and surface rentals. The Onshore Completion and Workover Services segment offers pressure pumping, fluid management and workover services. The Production Services segment gives intervention services. The Technical Solutions segment involves in the products and services that address customer-specific needs with applications, which typically require engineering, manufacturing or project planning. The company was founded by Terence E. Hall in 1989 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.