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Energy & Technology, Corp. provides engineering, manufacturing, reclamation, sale, destructive, and non-destructive testing (NDT), storage, maintenance, and inspection services for pipes and equipment utilized in the energy industry. It offers engineering services to assist customers in the design, improvement, installation, and integration of NDT components and systems; provides NDT services comprising ultrasonic inspection, electromagnetic inspection, and others; and sells pipes and equipment used in the exploration, drilling, and production of oil and gas. The company also provides manufacturing and reclamation services, including full-length electromagnetic inspection for pipes and equipment utilized in the energy industry; full length ultrasonic inspection systems for new and used pipes, such as drill stem, tubing, casing, and line pipes; and various types of electromagnetic and ultrasonic inspection processes. In addition, it offers wet or dry magnetic particle inspection services; dye penetrant testing or ultrasonic testing of the end areas of plain end and threaded connections comprising drill collars and drilling rig inspection; mill systems and mill surveillance; and testing and consulting services. Energy & Technology, Corp. serves oil companies, steel mills, material suppliers, drilling companies, material rental companies, and engineering companies. The company was formerly known as Technical Industries & Energy Corp. and changed its name to Energy & Technology, Corp. in August 2009. The company was founded in 2006 and is headquartered in Lafayette, Louisiana. Energy & Technology, Corp. is a subsidiary of American Interest, LLC.

ERHC Energy Inc. engages in the exploration and exploitation of oil and gas resources in Africa. Its principal assets include the rights to working interests in exploration acreage in the Republic of Kenya; the Republic of Chad; the Joint Development Zone between the Democratic Republic of Sao Tome and Principe; the Federal Republic of Nigeria; and the economic zone of Sao Tome. The company was founded in 1986 and is based in Houston, Texas.

Eco-Stim Energy Solutions, Inc. provides oilfield services in the United States and Argentina. The company offers pressure pumping, coiled tubing, and field management services to the upstream oil and gas industry. Its customers consist primarily of international oil and gas exploration and production companies, including national oil companies, local privately-held exploration and production companies, and other service companies. The company is headquartered in Houston, Texas.

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. 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 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 based in Houston, Texas.

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.