Current research status and key technology of drill pipe and column materials for extra deep wells

Abstract:

Extra-deep drilling is the only way to obtain deep physical data and establish a deep channel into the earth’s interior， which plays an increasing important role in the exploration of oil， natural gas and other energy resources. The selection and optimization of drill pipe material is one of the most critical core technologies that restrict the development of extra-deep drilling， which directly affects the drilling depth limit， drilling efficiency and economic cost of extra-deep drilling. This paper analyzes the problems faced by drill pipe materials from the complex loading conditions of extra-deep drilling drill pipes， combines the performance characteristics of steel drill pipes and lightweight drill pipes， compiles the domestic and international solutions for deep-well drill pipes， and summarizes the three key technologies of steel drill pipe toughening and regulation， corrosion-resistant treatment of drill pipes， and stress-concentration treatment， which provides a reference for the research on the development of extra-deep drilling drill pipes.

Key words:extra-deep drilling;drill pipe column;steel drill pipe;lightweight drill pipe;key technologies