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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.

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.

Royal Dutch Shell plc operates as an energy and petrochemical company worldwide. The company operates through Integrated Gas, Upstream, Oil Products, Chemicals segments. It explores for and extracts crude oil, natural gas, and natural gas liquids; markets and transports oil and gas; produces gas-to-liquids fuels and other products; and operates upstream and midstream infrastructure necessary to deliver gas to market. The company also markets and trades natural gas, liquefied natural gas (LNG), crude oil, electricity, carbon-emission rights; and markets and sells LNG as a fuel for heavy-duty vehicles and marine vessels. In addition, it trades in and refines crude oil and other feed stocks, such as gasoline, diesel, heating oil, aviation fuel, marine fuel, biofuel, lubricants, bitumen, and sulphur; produces and sells petrochemicals for industrial use; and manages oil sands activities. Further, the company produces base chemicals comprising ethylene, propylene, and aromatics, as well as intermediate chemicals, such as styrene monomer, propylene oxide, solvents, detergent alcohols, ethylene oxide, and ethylene glycol. Royal Dutch Shell plc was founded in 1907 and is headquartered in The Hague, the Netherlands.