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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.

Eco-Stim Energy Solutions, Inc. is an oilfield service and technology company. The company provides management technologies, well stimulation and completion services to oil and gas producers. Eco-Stim Energy Solutions, Inc. is based in Houston, Texas.

Petrominerals Corporation engages in the exploration, drilling, and production of oil and gas; and other oil industry-related businesses. It owns interests in oil producing properties in southern California. The company has a 53% working interest in the Castaic Hills Unit; a 100% working interest in a single oil well; and a 83.3% working interest in two oil wells in the Hasley Canyon field. Its properties are located in Santa Clarita, California. The company's net production of oil and gas was approximately 8 million barrels, as of December 31, 2003. It had approximately 23 gross oil and gas producing wells, as of the above date. Petrominerals Corporation was founded in 1966 and is based in Ventura, California.

Superior Energy Services, Inc. provides oilfield services and equipment to oil and natural gas exploration and production companies in the United States and internationally. The company operates in four segments: Drilling Products and Services, Onshore Completion and Workover Services, Production Services, and Technical Solutions. The Drilling Products and Services segment rents downhole drilling tools, including tubulars, such as primary drill pipe strings, landing strings, completion tubulars, and associated accessories, as well as manufactures and rents bottom hole tools comprising stabilizers, non-magnetic drill collars, and hole openers; and surfaces, such as temporary onshore and offshore accommodation modules and accessories. The Onshore Completion and Workover Services segment offers fluid management services used to obtain, move, store, and dispose of fluids that are involved in the exploration, development, and production of oil and gas; and workover services consisting of installations, completions, and sidetracking of wells, as well as support for perforating operations. The Production Services segment provides intervention services, such as coiled tubing, cased hole and mechanical wireline, hydraulic workover and snubbing, pressure control, production testing and optimization, and remedial pumping services. The Technical Solutions segment offers well containment systems; completion tools and services, including sand control systems, well screens and filters, and surface-controlled sub surface safety valves; and well and sand control, and stimulation services. This segment also produces and sells oil and gas. Superior Energy Services, Inc. was founded in 1991 and is headquartered in Houston, Texas. On December 7, 2020, Superior Energy Services, Inc., along with its affiliates, filed a voluntary petition for reorganization under Chapter 11 in the U.S. Bankruptcy Court for the Southern District of Texas.