PCDS精细控压钻井技术新进展

New Progress on PCDS Precise Pressure Management Drilling Technology

为解决钻进复杂地层时普遍存在的井涌、漏失、坍塌和卡钻等井下故障,特别是“溢漏同存”窄安全密度窗口地层安全钻进的问题,研制了PCDS精细控压钻井系列装备,形成了欠/近/过平衡精细控压钻井技术,以及9种工况、4种控制模式、13种应急转换的精细控压钻井工艺,并在不同类型的复杂地层进行了应用,解决了“溢漏同存”窄安全密度窗口地层安全钻进的难题,提高了油气勘探发现率,大幅延长了水平井水平段长度,提高了单井产量。详细介绍了PCDS精细控压钻井装备的发展过程及最新进展,分析了PCDS精细控压钻井技术的现场应用效果,指出了控压钻井技术将向高效一体化方向发展,应用领域也将不断拓宽,其与信息化、智能化结合,将形成智能井筒安全控制钻井技术,为未来智能钻井技术奠定基础。

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.