China Petroleum & Chemical Corporation Northwest Oilfield Branch Company
China National Petroleum Corporation Liaohe Oilfield Company
Gaia (Dongying) Petroleum Technology Development Center
Liaoning Huafu Petroleum Hi-Tech Co., Ltd.
Karamay Xinkeao Oil and Gas Technology Co., Ltd.
Dongying Huicheng Petroleum Engineering Technology Co., Ltd.
Sinopec Xinjiang Xinchun Petroleum Development Co., Ltd.
Tianjin Hangweida Machinery Equipment Co., Ltd.
Daqing Renzhongren Petroleum Technology Co., Ltd.
Xinjiang Oilfield Company Materials Supply Corporation
Xinjiang Petroleum Administration Co., Ltd.
Xinjiang Petroleum Engineering Construction Co., Ltd.
China National Petroleum Pipeline Second Engineering Co., Ltd.
China Petroleum & Chemical Corporation Jiangsu Oilfield Branch
The Fourth Engineering Branch of China Petroleum Pipeline Bureau
Xinjiang Plateau Petroleum Equipment Co., Ltd.
Binnan Oil Production Plant of Shengli Oilfield Branch of China Petroleum & Chemical Corporation
China Petroleum Pipeline Bureau
PetroChina Guizhou Natural Gas Pipeline Co., Ltd.
China National Petroleum Corporation Tarim Oilfield Branch
Beijing Demei Hi-Tech Technology Co., Ltd.
China Petroleum Pipeline Construction Co., Ltd.
China Petroleum Pipeline Materials and Equipment Co., Ltd.
Shengli Oilfield Deli Industry Co., Ltd. Xinjiang Branch

...and more...continuously updating...