Offshore Oil Engineering Co., Ltd. belongs to the petroleum industry and is headquartered in Tianjin.
2. Pipeline in Jinzhou area.
Zhejiang Jinzhou Pipeline Technology Co., Ltd. belongs to the metal products industry and is headquartered in Huzhou, Zhejiang.
3. PetroChina project.
China Petroleum Group Engineering Co., Ltd. is a company mainly engaged in oil and gas field ground engineering services, storage and transportation engineering services and other related petroleum engineering construction businesses, belonging to the engineering construction industry and headquartered in Beijing.