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Allied Resources, Inc., an independent oil and natural gas producer, engages in the exploration, development, production, and sale of oil and gas in the United States. It owns varying interests in a total of 145 wells situated on acreage of approximately 3,400 acres in Ritchie and Calhoun counties, West Virginia; and 10 wells situated on acreage of approximately 2,510 acres in Goliad, Edwards, and Jackson counties, Texas. The company was formerly known as General Allied Oil and Gas Co and changed its name to Allied Resources, Inc. in August 1998. Allied Resources, Inc. was founded in 1979 and is based in Salt Lake City, Utah.

Arabella Exploration, Inc., an independent oil and natural gas company, focuses on the acquisition, development, exploration, and exploitation of unconventional onshore oil and natural gas reserves in the Delaware Basin in West Texas. The company primarily holds interest the Wolfcamp and Bone Spring formations. It holds interest in approximately 1,562 net acres in the Delaware Basin. As of December 31, 2015, the company had approximately 785,470 thousand barrels of estimated net proved oil reserves; and 1,571,842 million cubic feet of natural gas reserves. Arabella Exploration, Inc. is headquartered in Fort Worth, Texas.

BPI Energy Holdings, Inc., through its subsidiary, BPI Energy, Inc., engages in the acquisition, exploration, development, production, and sale of coalbed methane (CBM) properties in the United States. It owns approximately 500,000 acres of CBM rights in the Illinois Basin. The company also has interests in Southern Illinois Basin project covering approximately 10,000 acres in the southern part of the Illinois Basin; the Northern Illinois Basin project covering 353,531 acres in Montgomery, Shelby, Christian, Fayette, and Macoupin Counties in Illinois; and the Western Illinois Basin project covering 135,948 acres in Clinton, Washington, Marion, and Perry Counties in Illinois. The company was founded in 1980 and is headquartered in Solon, Ohio.

Cobalt International Energy, Inc., through its subsidiary Cobalt International Energy, L.P., operates as an independent oil focused exploration and production company with a highly prospective world-class portfolio in the deepwater U.S. Gulf of Mexico and offshore West Africa. All of the Company's prospects are oil-focused. The company is based in Houston, Texas.

PetroChina Company Limited, together with its subsidiaries, engages in a range of petroleum related products, services, and activities in Mainland China and internationally. It operates through Exploration and Production, Refining and Chemicals, Marketing, and Natural Gas and Pipeline segments. The Exploration and Production segment engages in the exploration, development, production, and marketing of crude oil and natural gas. The Refining and Chemicals segment refines crude oil and petroleum products; and produces and markets primary petrochemical products, derivative petrochemical products, and other chemical products. The Marketing segment is involved in marketing of refined products and trading business. The Natural Gas and Pipeline segment engages in the transmission of natural gas, crude oil, and refined products; and sale of natural gas. As of December 31, 2021, the company had a total length of 26,076 km, including 17,329 km of natural gas pipelines, 7,340 km of crude oil pipelines, and 1,407 km of refined product pipelines. The company is also involved in the exploration, development, and production of oil sands and coalbed methane; trading of crude oil and petrochemical products; storage, chemical engineering, storage facilities, service station, and transportation facilities and related businesses; and production and sales of basic and derivative chemical, and other chemical products. The company was founded in 1999 and is headquartered in Beijing, the People's Republic of China. PetroChina Company Limited is a subsidiary of China National Petroleum Corporation.