Zhong Guo Xin Wen Wang·2025-06-25 04:46Core Viewpoint - China National Offshore Oil Corporation (CNOOC) announced the full production of the "Deep Sea No. 1" Phase II project, marking the completion of China's largest offshore gas field [1][3]. Group 1: Project Overview - The "Deep Sea No. 1" gas field has a total proven geological reserve of over 150 billion cubic meters, with the maximum operational water depth exceeding 1,500 meters and well depths over 5,000 meters [1][3]. - The Phase II project faced extreme geological conditions, with the highest formation temperature reaching 138 degrees Celsius and maximum pressure exceeding 69 MPa, which is equivalent to 1,000 times the working pressure of a household pressure cooker [3]. Group 2: Technological Innovations - The project introduced an innovative development model combining underwater production systems, shallow water jacket platforms, and deep-water semi-submersible platform remote control systems [3]. - A total of 12 underwater gas wells were deployed across three well areas (south, north, east), along with the construction of one jacket platform, one underwater production system, five subsea pipelines, and five deep-water umbilicals, creating a large-scale oil and gas production facility cluster spanning over 170 kilometers [3]. Group 3: Production Capacity and Impact - The "Deep Sea No. 1" gas field has reached its maximum design capacity, with an expected annual gas production of over 4.5 billion cubic meters [3]. - The produced deep-water natural gas will flow to the Guangdong-Hong Kong-Macao Greater Bay Area and Hainan through various land terminals, integrating into the national natural gas pipeline network [3][4].