What are the private enterprises in China petroleum industry (non-chemical industry)? Who are the drilling talents?

As far as I know, from my oil field, it seems that there are many private companies that we serve here, such as Beijing Huayou, Gasoline, Anton Oil and Beijing Yuan Ke. These companies need to recruit all kinds of petroleum professionals, from platform managers, engineers to operators, and some professional service companies also need a large number of petroleum talents. The key is that you have certain professional knowledge and can bear hardships. Because the oil industry is hard! I hope to help you again.