基于多孔弹性模型及动态温度场的井壁稳定研究  

Research on the wellbore stability based on the porous elastic modeland the dynamic temperature field

作　　者：刘宇沛 岳家平 彭涛 李白雪 平伟 LIU Yupei;YUE Jiaping;PENG Tao;LI Baixue;PING Wei(CNOOC Research Institute Ltd.,Beijing,100020,China;China Petroleum&Chemical Corporation Jianghan Oilfield Branch Petroleum Engineering Technology Research Institute,Wuhan,Hubei,430033,China;School of Petroleum Engineering,Yangtze University,Wuhan,Hubei,430100,China;West-East Gas Pipeline Branch of State Oil and Gas Pipeline Network Group Co.,Ltd.,Shanghai,200120,China)

机构地区：[1]中海油研究总院有限责任公司,北京100020 [2]中国石油化工股份有限公司江汉油田分公司石油工程技术研究院,湖北武汉430033 [3]长江大学石油工程学院,湖北武汉430100 [4]国家石油天然气管网集团有限公司西气东输分公司,上海200120

出　　处：《天然气与石油》2023年第2期93-99,共7页Natural Gas and Oil

基　　金：国家自然科学基金“页岩气开发条件下泥页岩井壁稳定与破裂机理研究”(51174036)。

摘　　要：井壁失稳、坍塌是油气井钻井施工中必须应对的难题。针对复杂地层尤其是非连续地层的超深钻井(>6000 m)过程,通过研究岩石力学特性、孔隙渗流、井壁受应力与温度场等相互耦合作用,对复杂特殊地层中井壁稳定性进行分析。在此基础上,利用线性叠加原理结合地层渗流影响、孔隙压力变化以及地层温度场变化引起的热诱导应力分量,组合到原位多孔弹性模型中,建立热孔弹性模型,并结合D-P失效准则和“应力云”思想,形成了多孔弹性模型及动态温度场耦合的井壁稳定分析方法,并取深水浅部区块1口实例井的钻井过程进行验证。研究结果表明,延长钻井液循环时间有利于地层冷却和井眼清洁,但随着循环时间延长,井壁与地层之间温差过大,叠加的热诱导应力值会加大岩层各向应力差值,易发生失稳。研究结果拓宽了以往井壁稳定性分析方法的应用范围,提高了计算精度。The instability and collapse of the wellbore are the problems that must be dealt with in the drilling engineering.Aiming at the ultra-deep drilling(>6000 m)process of complex formations,especially discontinuous formations,the stability of the wellbore in complex and special formations is analyzed through the coupling effects of rock mechanical properties,pore seepage,wellbore stress and temperature field.This paper uses the linear superposition principle to combine the thermally induced stress components which caused by the influence of formation seepage,pore pressure changes and changes in the formation temperature field into the in-situ porous elastic model,built up a thermal porous elastic model,and combined the D-P failure criterion and the“stress cloud”idea to establish a wellbore instability analysis model coupled with a porous elastic model and a dynamic temperature field,and the drilling process of an example well in the shallow part of deep water block is validated.The results show that longer drilling circulation time can achieve better formation cooling and hole cleaning effects,but as the circulation time increases,the temperature difference between the wellbore and the formation is too large,and the superimposed thermally induced stress value will increase.The stress difference in all directions of a large rock formation is more prone to instability.The research results broaden the range of application of the previous method of wellbore stability analysis and improve the calculation accuracy.

关 键 词：复杂地层 热孔弹性模型 钻井液循环 井壁稳定性 

分 类 号：TE21[石油与天然气工程—油气井工程]