What level does Changqing Oilfield belong to?

According to the query of official website of Changqing Oilfield, Changqing Oilfield belongs to bureau level. Changqing Oilfield is the abbreviation of China Petroleum Changqing Oilfield Company and an important part of China Petroleum and Natural Gas Group Company. Changqing Oilfield is headquartered in Xi City, Shaanxi Province. The production areas are mainly distributed in the northern and western regions of Shaanxi Province, and also involve neighboring provinces such as Gansu and Ningxia. Changqing Oilfield is one of the largest oilfields in China with huge output, ranking first among all oilfields in China for many years. On the one hand, it benefits from advanced mining technology and equipment, on the other hand, it is also related to the geological environment of the oilfield.