On October 16, CNOOC announced that the first development well operation of the second phase of my country's first deepwater high-pressure project "Shenhai No. 1" was successfully completed, with the daily natural gas production exceeding 1 million cubic meters and daily condensate production tested. It exceeds 230 cubic meters, and the production capacity far exceeds the design expectations. It effectively proves the effectiveness and reliability of the complete set of deepwater oil and gas exploration and development technologies independently established by my country in practical application, and has important demonstration significance in promoting the efficient exploration and development of domestic deepwater complex oil and gas resources.
The gas field of the second phase of the "Deep Sea No. 1" project is located in the southern waters of Hainan Island. It is constructed using the "underwater production system + shallow water jacket processing platform + deep water semi-submersible platform remote control system" model. It is divided into three parts: south, north and east. 12 underground gas wells are deployed in each well area to develop the Lingshui 25-1 deepwater block in an area about 70 kilometers away from the "Deep Sea No. 1" energy station. The maximum formation pressure reaches 69 MPa. The operating water depth of the first development well completed this time is nearly 1,000 meters, the completed drilling depth is more than 5,000 meters, the horizontal distance between the end of the well structure and the wellhead is more than 2,000 meters, and the maximum well inclination angle reaches 91 degrees. It is a deep water project that is extremely difficult to implement. Extended reach horizontal well.
"Ensuring that deepwater high-pressure wells can be drilled well and quickly is an important technical goal for the second phase of the 'Deep Sea No. 1' drilling and completion operation." Liu Shujie, Chief Engineer (Drilling and Completion) of CNOOC Hainan Branch introduced According to the report, the total drilling footage of the second phase of the "Deep Sea No. 1" project has reached 2.2 times that of the first phase. Thanks to the full use of batch well construction ideas, the overall progress of the project's drilling operations has reached 80% when the first well is completed. The speed-up of work has been remarkable.
The reporter learned that after the completion of the second phase of the "Shenhai No. 1" project, the overall peak annual output of the "Shenhai No. 1" ultra-deepwater gas field will increase from 3 billion cubic meters to 4.5 billion cubic meters, which is equivalent to Hainan Island. 90% of natural gas consumption in 2021 will provide sufficient clean energy guarantee for the economic construction of South my country.
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