PetroChina. 

PetroChina Company Limited (PCCYF) is a comprehensive energy corporation, operating as a key subsidiary of China National Petroleum Corporation. Founded in 1999 and based in Beijing, China, its expansive operations span various petroleum-related products, services, and activities across Mainland China and internationally. Its business model is divided into four primary segments: The Exploration and Production (E&P) segment handles the entire upstream process, from discovering and developing new reserves to the extraction and marketing of crude oil and natural gas. The Refining and Chemicals segment is responsible for processing crude oil and petroleum products, alongside manufacturing and distributing a broad spectrum of petrochemicals, including primary, derivative, and other chemical compounds. The Marketing segment focuses on the sale of refined petroleum products and engaging in trading activities. The Natural Gas and Pipeline segment manages the extensive transportation network for natural gas, crude oil, and refined products, in addition to the direct sales of natural gas. Demonstrating its vast infrastructure, as of December 31, 2021, the company operated a comprehensive pipeline system totaling 26,076 km. This network includes 17,329 km dedicated to natural gas, 7,340 km for crude oil, and 1,407 km for refined products. Beyond these core segments, PetroChina's operations also extend to the exploration, development, and production of unconventional resources like oil sands and coalbed methane. It further engages in the global trading of crude oil and petrochemicals, alongside managing diverse related businesses such as storage, chemical engineering services, service station networks, and various transportation and logistics facilities.