Completion and cementing technologies for ultra deep wells in marine oil and gas fields

At present, most oil and gas resources in the world is discovered in marine basins. However, the degree of marine exploration and development is much lower in China. In recent years, the exploration and development of marine oil reservoirs have been accelerated based on the discovery of large scale oil and gas fields in Tarim and Sichuan Basins. Marine exploration and development is an international technical problem. In view of the characteristics of marine reservoirs such as the large burial depth, the long bare hole, the high pressure, the complicated casing program, the multiple formation pressure gradients and the containing of harmful gas, the technical problems in exploration and development of marine oil reservoirs are introduced in detail, and the research on the ultra deep well completion and cementing processes, tools, the cement slurry system, and their support technologies are conducted. Good field application results have been obtained, providing technical support for the completion and cementing processes used in domestic marine oil and gas fields. 