The drilling operation of the deepwater development well with the highest pressure in my country has been completed!

The second phase of "Deep Sea No. 1" is my country's first deepwater high-pressure gas field project, with proven natural gas geological reserves exceeding 50 billion cubic meters. It adopts an "underwater production system + shallow water jacket processing platform" +Construction of "deep-water semi-submersible platform remote control system" model. Among the 12 underground gas wells intensively deployed in three well areas in the south, north and east of the project, three wells are deepwater and high-pressure wells.

The A12 well completed this time is the one with the highest pressure and the most difficult operation. The pressure coefficient of the target layer reaches 1.74, and the formation pressure reaches 69 MPa, which is equivalent to the working pressure of a household pressure cooker. 1000 times, the technical difficulty and safety risks of drilling operations are very high.

“We have carried out 16 scientific research projects on wellbore safety, cost reduction and efficiency improvement, and have overcome six key problems such as safety control of deepwater high-pressure wells and maintenance of development wellbore integrity, forming a The safe drilling operation plan for Well A12 ensures the successful realization of the operation objectives. "The drilling director of CNOOC's "Deep Sea No. 1" Phase II project said that the safe implementation of the drilling operation for the highest pressure well is crucial to the "Deep Sea No. 1" Phase II project. It has important guiding significance for subsequent well operations and the development of similar deepwater high-pressure oil and gas resources.

According to the chief engineer of CNOOC Hainan Branch, the drilling depth of Well A12 exceeded 4,300 meters. At this point, the total drilling footage of the second phase of the "Deep Sea No. 1" project has exceeded 50,000 meters, which is equivalent to At the height of six Mount Everests, the overall progress of drilling operations has reached 90%. The drilling operation period of the entire project is more than 150 days ahead of schedule, and the efficiency is improved by more than 30%, laying a solid foundation for the project to be put into production on time.

It is understood that after the second phase of the "Shenhai No. 1" project is put into operation, it will increase the peak annual output of the "Shenhai No. 1" gas field to 4.5 billion cubic meters, equivalent to the natural gas in Hainan Island. 90% of consumption.