What are the subordinate units of Southwest Oil and Gas Field Company? The name of a specific unit.

This seems a bit difficult. There are nearly 40 subordinate secondary units. Chongqing Gas Mine and other atmospheric mines, Chengdu, Chongqing Natural Gas Purification General Plant, Natural Gas Research Institute and other scientific research units, sales companies, information centers, material companies, automobile service centers, communication companies, Huayou Company, Chongqing Public Management Center and other logistics units. There's a lot to say.