控压钻井(MPD)技术是解决具有窄安全密度窗口、易漏易喷地层安全钻井的一项关键技术。控压钻井的适应性评价技术是控压钻井科学选井选层、安全实施的关键。目前国内外还没有成熟的控压钻井适应性评价体系。首先对控压钻井应用类别分类和IADC分类进行了对比,选用IADC颁布的5种流体类型、6个风险等级、3种应用形式的分类方法。然后从地质、工程和经济角度建立了控压钻井地质适应性评价方法,即“三步法”评价体系,主要包括必要性评价、可行性评价、技术经济性评价,在此基础上提出了控压钻井地质适应性评价的关键技术,即地质环境因素描述、精细水力学计算、设备配套与优选、压力控制方法、经济性评价。最后在缅甸D区块进行了应用,结果表明所建立的分类方法和地质适应性评价技术具有很强的实用性。
Managed Pressure Drilling (MPD) is the key drilling technology for forming with narrow safe density window and being prone to leakage and blowout. The adaptability evaluation technology of MPD is vital to the selection of well and layer and safe operation of MPD. Currently, there is no well-established MPD adaptability evaluation system at home and abroad. The application category and IADC classification about MPD technology are contrasted. The final selection is IADC MPD classification promulgated in 2005, which is a catalog with five kinds of fluid type, six risk level classification, and three kinds of application forms. The geological adaptability evaluation methods of MPD are established. It is the three-step evaluation system, including necessity evaluation, feasibility evaluation, and technical and economic evaluation. The key technologies of MPD geological adaptability evaluation are developed, namely, geological environmental factors describing technology, fine hydraulics model, device matching and optimization, and economic evaluation. Finally, the applications of the technologies in the Block D of Myanmar show that the established classification and geological adaptability evaluation technology has the highly practical value.