页岩地层井壁稳定多模型对比  

Multi-model comparison of the borehole stability in shale formations

作　　者：王书婷 张景富[1] 刘鹏飞[2] WANG Shuting;ZHANG Jingfu;LIU Pengfei(School of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,China;No.3 Oil Production Plant of Daqing Oilfield Co Ltd.,Daqing 163256,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]大庆油田有限责任公司第三采油厂,黑龙江大庆163256

出　　处：《大庆石油地质与开发》2020年第2期166-174,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“油井水泥环环空封固可靠性力学分析与研究”(51474074)。

摘　　要：为有效提高石油钻井过程中井壁稳定性预测及分析可靠性,深入对比分析了3种常用井壁稳定模型,包括传统Kirsch模型、常规孔隙弹性模型及双孔介质孔隙弹性模型。结果表明:运用传统Kirsch模型,结合Mogi-Coulomb强度破坏准则,能够成功预测合理钻井液密度,但该模型仅能运用于稳定状态;常规孔隙弹性模型能有效地解释井壁失稳延迟现象以及井壁内部起裂现象,能成功应用于瞬时压力传递状态;双孔介质孔隙弹性模型所需参数繁多,目前不适合现场实际应用。基于现场实际钻井情况,将传统Kirsch模型和常规孔隙弹性模型协同使用,可灵活选择合理钻井液密度,有效预防井壁坍塌。研究成果可有效指导钻井现场井壁应力模型选择和井壁稳定分析,为安全高效钻井提供可靠保证。In order to effectively improve the stability prediction of the wellbore stability and analysis reliability in the process of the oil drilling,three popular wellbore stability models were deeply analyzed and compared,including traditional Kirsch model,conventional poroelastic model and dual-porosity-medium poroelastic model.The results show that with the help of the traditional Kirsch model,combined with Mogi-Coulomb failure criterion,the reasonable drilling fluid density can be successfully predicted.However,Kirsch model can only be used for the steady state;The conventional poroelastic model can effectively explain the phenomena of the time-delayed wellbore instability and inner-wellbore cracking,so it can be successfully applied in the state of the transient pressure transformation;Due to so many parameters needed in the dual-porosity-medium poroelastic model,so it is not actually applicable in the field.On the basis of the field drilling reality,the traditional Kirsch model and conventional poroelastic model can be synergetically applied,thus the rational drilling fluid density can be flexibly chosen,the wellbore collapse can be effectively prevented.The study achievements can effectively guide the choice of the wellbore stress model and the analysis of the wellbore stability in the field,and furthermore they can provide reliable guardance for the safe and dffective drilling.

关 键 词：页岩地层 井壁稳定 多模型对比 井壁坍塌 井壁应力模型 

分 类 号：TE254.3[石油与天然气工程—油气井工程]