PetroChina Company Limited, together with its subsidiaries, produces and sells oil and gas in the People’s Republic of China. The company operates through Exploration and Production, Refining and Chemicals, Marketing, and Natural Gas and Pipeline segments. The Exploration and Production segment is involved 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 engages in marketing refined products, as well as in trading business. It operates 20,422 service stations. The Natural Gas and Pipeline segment is involved in the transmission of natural gas, crude oil, and refined products; and sale of natural gas. As of December 31, 2014, it had oil and gas pipelines of 76,795 km consisting of 48,602 km of natural gas pipelines, 18,107 km of crude oil pipelines, and 10,086 km of refined product pipelines. The company was founded in 1988 and is based in Beijing, the People’s Republic of China. PetroChina Co. Ltd. operates as a subsidiary of China National Petroleum Corporation.