New Progress on PCDS Precise Pressure Management Drilling Technology

In order to solve the downhole problems of well kicks, leakage, collapse, stuck pipe string, etc., all of which are common in drilling complex formations, especially in the case of safe drilling in narrow safety density window formation characterized by the co-existence of overflow and leakage, the CNPC Engineering Technology Research Institute has developed the PCDS precise pressure management drilling equipment series. In addition, they formed under/near/overbalanced precise pressure management drilling technologies, together with pressure management drilling processes that are suitable for nine kinds of working conditions, four kinds of control modes, and thirteen kinds of emergency conversion modes. Those technologies have been applied in various complex strata and have effectively solved the above-mentioned problems. The new breakthrough techniques and technologies have dramatically improved the discovery rates in oil and gas exploration, and have dramatically extended the length of horizontal section in horizontal wells. In addition, they have improved the production of single wells. This paper introduces the development processes and latest progresses of PCDS precise pressure management drilling equipment in details, and analyzes the field application effect of PCDS fine precise pressure management drilling technology. It is pointed out that this technology has a goal of achieving high-efficiency integration, and the locations where the technologies are applied will be continuously expanded. By combining this technology with data science and artificial intelligence, it is expected that the next steop will involve intelligent wellbore safety control drilling technology which will lay the foundation for future intelligent drilling technologies.