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Cnooc Limited is a company that engages primarily in the exploration, development and production of crude oil and natural gas offshore China. We are the dominant producer of crude oil and natural gas and the only company permitted to conduct exploration and production activities with international oil and gas companies offshore China.

Eni S.p.A. operates as an integrated energy company worldwide. The company engages in exploration, development, extracting, manufacturing, and marketing crude oil and natural gas, oil-based fuels, chemical products, and gas-fired power, as well as energy products from renewable sources. It operates through Exploration & Production; Global Gas & LNG Portfolio (GGP); Enilive, Refining and Chemicals; Plenitude & Power; and Corporate and Other Activities segments. The company engages in research, development, and production of oil, condensates, and natural gas. It is also involved in the supply and sale of wholesale natural gas through pipeline; and international transport, and purchase and marketing of liquefied natural gas. In addition, the company supplies bio-feedstock and crude oil; and stores, produces, distributes, and markets biofuels, oil products, biomethane, basic chemical and petrochemical products, intermediates, plastics and elastomers, and other chemicals, as well as provides smart mobility solutions and mobility services. Further, it engages in the retail marketing of gas, electricity, and related services; production and wholesale sale of electricity from thermoelectric and renewable plants; and provision of services for E-mobility. The company was founded in 1953 and is headquartered in Rome, Italy.

Occidental Petroleum Corporation, together with its subsidiaries, engages in the acquisition, exploration, and development of oil and gas properties in the United States, the Middle East, and North Africa. It operates through three segments: Oil and Gas, Chemical, and Midstream and Marketing. The company's Oil and Gas segment explores for, develops, and produces oil and condensate, natural gas liquids (NGLs), and natural gas. Its Chemical segment manufactures and markets basic chemicals, including chlorine, caustic soda, chlorinated organics, potassium chemicals, ethylene dichloride, chlorinated isocyanurates, sodium silicates, and calcium chloride; and vinyls comprising vinyl chloride monomer, polyvinyl chloride, and ethylene. The Midstream and Marketing segment gathers, processes, transports, stores, purchases, and markets oil, condensate, NGLs, natural gas, carbon dioxide, and power. This segment also invests in entities. Occidental Petroleum Corporation was founded in 1920 and is headquartered in Houston, Texas.

Pioneer Natural Resources Company operates as an independent oil and gas exploration and production company in the United States. The company explores for, develops, and produces oil, natural gas liquids (NGLs), and gas. It has operations in the Midland Basin in West Texas. The company was founded in 1997 and is headquartered in Irving, Texas.