Core Viewpoint - China National Offshore Oil Corporation (CNOOC) has fully launched the second phase of the "Deep Sea No. 1" gas field project in the South China Sea, marking the completion of the largest offshore gas field in China [1][2] Group 1: Project Overview - The "Deep Sea No. 1" gas field consists of two phases, with the first phase commencing production in June 2021 and proven natural gas geological reserves exceeding 150 billion cubic meters [1] - The project operates at a maximum water depth of over 1,500 meters and a maximum well depth exceeding 5,000 meters, making it the deepest and most challenging deep-water gas field developed independently in China [1] Group 2: Technical Challenges - The second phase of the project faces extreme geological conditions, with the highest formation temperature reaching 138 degrees Celsius and maximum pressure exceeding 69 MPa, which is 1,000 times the working pressure of a household pressure cooker [1] - The project manager highlighted the innovative development model combining underwater production systems, shallow water jacket platforms, and deep-water semi-submersible platforms with remote control systems [1] 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 exceeding 4.5 billion cubic meters [2] - 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 [2] - The facilities and technical systems established during the construction of the two phases are expected to facilitate the development of other complex deep-water oil and gas reserves in the Hainan sea area, enhancing the contribution of marine oil and gas to domestic energy supply [2]