Group 1 - The "Deep Sea No. 1" Phase II project has achieved full production, with a total of 23 underwater gas wells operational, reaching a maximum daily output of 15 million cubic meters, making it the largest offshore gas field in China [2][4] - The project consists of two phases, with Phase I launched in June 2021 and Phase II deploying 12 underwater gas wells across three areas, along with new infrastructure including a platform and underwater production systems [2][3] - The project faces complex natural conditions, with total well depths exceeding 60,000 meters, maximum formation temperatures of 138 degrees Celsius, and pressures reaching 69 MPa, presenting significant technical challenges [3] Group 2 - The "Deep Sea No. 1" gas field is expected to produce over 4.5 billion cubic meters of gas annually, with the gas being distributed to regions such as the Guangdong-Hong Kong-Macao Greater Bay Area and Hainan Free Trade Port [4] - The project has led to the development of five world-first key technologies for deep-water high-pressure well drilling and completion, enhancing operational efficiency by over 30% [3] - An innovative development model combining underwater production systems with shallow water platforms and deep-water semi-submersible platform remote control systems has been introduced, transforming existing shallow water gas field facilities into gas transmission hubs [3]

Core 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].