摘要
为减少泥页岩地层,特别是高温-高压泥页岩地层的井眼失稳问题,将泥页岩地层视为孔隙介质,在综合考虑岩石特性、井眼周围三维地应力、化学及热效应等因素对泥页岩地层井眼稳定的影响的情况下建立了井眼周围有效应力计算模式,通过有限差分法进行求解。结合地层失效准则,得到了温度、渗流以及岩石特性对坍塌压力和破裂压力的影响规律。研究的结果表明对低渗透率的泥页岩来说,热效应以及化学反应在确定钻井液密度窗口时起到重要作用。计算结果对实际钻井有理论上的指导意义。
Wellbore instability is regarded as a major problem in oil and gas drilling operations, especially in high temperature and high pressure shale formation. Many factor, such as rock properties, 3D stresses, chemical shale/fluid interactions and thermal effects, should be considered in the wellbore stability analysis in order to reduce wellbore instability problems. The shale formation is considered as pore medium. A comprehensive study of wellbore stability in shale formations that takes into account the 3D stresses around the wellbore as well as chemical and thermal effects is presented. The effective stresses calculation mode of shale formation in oil well is set up, combining with the failure criteria of formation, the wellbore instability mechanism is analyzed. Results form this study indicate that for low permeability shales, thermal effect and chemical interactions between the shale and water-based fluids play an important role in determining the mud-weight-window. The calculation results can guide drilling practices.
出处
《钻采工艺》
CAS
北大核心
2006年第6期1-4,141,共4页
Drilling & Production Technology
基金
全国优秀博士论文基金项目
编号:200349。
作者简介
王炳印（1977-），1998年毕业于石油大学（华东）矿机专业，现为石油大学（北京）油气井工程专业在读博士生，主要研究方向为套管损坏和岩石力学。地址：（100083）北京海淀区北四环中路263号，电话：010-82332780,E-mail：wangbingyin@126.com
