PetroChina. 

PetroChina Company Limited, through its subsidiaries, conducts a broad range of petroleum-related operations, products, and services across Mainland China and internationally. Its activities are organized into four primary divisions: Exploration and Production, Refining and Chemicals, Marketing, and Natural Gas and Pipeline. The Exploration and Production segment is dedicated to discovering, developing, extracting, and selling crude oil and natural gas. Within Refining and Chemicals, the company processes crude oil and various petroleum products, alongside manufacturing and distributing a wide array of petrochemicals, encompassing primary, derivative, and other chemical products. The Marketing division focuses on the commercialization of refined products and engages in trading. Its Natural Gas and Pipeline segment is responsible for the transmission of natural gas, crude oil, and refined products, in addition to the sale of natural gas. As of December 31, 2021, PetroChina managed an extensive pipeline network stretching 26,076 kilometers, which included 17,329 km for natural gas, 7,340 km for crude oil, and 1,407 km for refined products. The company's portfolio also extends to the exploration, development, and production of oil sands and coalbed methane; trading of crude oil and petrochemicals; managing storage facilities, chemical engineering, service stations, and transportation logistics; and the production and sale of various basic and derivative chemical products. Founded in 1999, PetroChina is headquartered in Beijing, People's Republic of China, and functions as a subsidiary of China National Petroleum Corporation.