The state-owned enterprises in Cangzhou mainly include Cangzhou Gongyun Company, Cangzhou Dahua Group Co., Ltd., Hebei Bohai Investment Group Co., Ltd., Cangzhou Construction Investment Group Co., Ltd., Cangzhou Bank and Huabei Oilfield. The third oil production plant is the third oil production plant of China Petroleum and Natural Gas Co., Ltd. in Cangzhou and Huabei Oilfield Branch, and it is the environmental information disclosure of key pollutant discharge units in Cangzhou in 2022.

Dagang Oilfield Oil Production Plant No.3 is located in Jiuzhou Town, Cang County, Cangzhou City, Hebei Province. In 202 1 year, No.3 Oil Production Plant invested 4 million yuan to build 4 sets of closed oil unloading devices in Suning operation area, Ningbei operation area, Liuxi operation area in xian county and Hejian operation area in Cangzhou area. At present, the project has been completed. After the implementation of this project, VOCs emission during oil unloading can be reduced, which meets the requirements of environmental protection, national, local and industrial policies and regulations, and further protects the environment.