Offshore Oil Engineering Co., Ltd. (COOEC) was founded in April 2000 as a majority-held subsidiary of China National Offshore Oil Corporation (CNOOC), a central state-owned enterprise, and is listed on the Shanghai Stock Exchange (Stock Code: 600583). Headquartered in Tianjin Binhai New Area, COOEC is China's only large-scale EPCI general contractor integrating offshore oil & gas development engineering, onshore fabrication, offshore installation, commissioning, and maintenance. The company is also recognized as one of the largest and most capable offshore oil & gas engineering contractors in the Asia-Pacific region.

COOEC operates major offshore engineering fabrication bases in Tianjin, Qingdao, Zhuhai, and Yantai, covering a total area of nearly 4 million square meters. The company possesses full value-chain service capabilities for deepwater and ultra-deepwater oil & gas engineering projects. Its core business spans offshore oil & gas, LNG, offshore wind, and refinery engineering, with operations across more than 40 countries and regions worldwide. Signature projects include the "Deep Sea No. 1" semi-submersible platform, FPSOs (Floating Production Storage and Offloading vessels), and large-scale subsea pipeline installations, with technological capabilities ranking among the world's leading players.