页岩气储层断层滑移对水平井套管变形的影响

Influence of fault slip on casing deformation of horizontal well in shale gas reservoir

毛良杰,林颢屿,余星颖,麦洋

西南石油大学石油与天然气工程学院，四川 成都 610500 西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500 中国石油川庆钻探工程有限公司试油修井公司，四川 成都 610056 四川宏华石油设备有限公司，四川 成都 610036

School of petroleum and natural gas engineering, Southwest Petroleum University, Chengdu 610500, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China Well Testing and Workover Company of Chuanqing Drilling Engineering Co., Ltd., PetroChina, Chengdu 610056, China Sichuan Honghua Petroleum Equipment Co., Ltd., Chengdu 610036, China

水平井压裂后附近断层发生滑移，诱发套管产生剪切变形，进而卡阻井下工具，严重影响页岩气的开采。文中应用有限元软件，建立了基于断层滑移的套管变形有限元模型，并据此分析了影响套管Mises应力分布的各种因素，研究了各角度断层在不同滑移量下的套管变形情况。结果表明：断层滑移会导致套管发生剪切变形，变形位置位于套管与断层相交处，且套管变形量随断层滑移量增加而增大；地层弹性模量对套管变形影响较小，套管弹性模量对套管变形影响较大；套管壁厚越大，地层施加给套管的剪切力对套管Mises应力的影响越小；在断层滑移量相同的情况下，断层角度越大，套管Mises应力越大，套管变形后的最小内径越小。研究成果可为防治断层滑移引起的套管剪切变形提供参考。

After horizontal well fracturing, nearby fault slip induces casing shear deformation and blocks downhole tools, which seriously affects the production of shale gas. In this paper, the finite element model of casing deformation based on fault slip is established by using finite element software. The different influence factors on casing stress distribution is analyzed, and the casing deformation of fault at different angles under different slip amount is studied. The results show that fault slip will lead to casing shear deformation, the deformation position is located at the intersection of casing and fault, and the casing deformation increases with the increase of fault slip amount. The formation elastic modulus has little effect on casing deformation, while the casing elastic modulus has great effect on casing deformation. The greater the casing wall thickness is, the smaller the influence of the formation shear force imposed to casing on casing Mises stress is. In the case of the same fault slip amount, the larger the acute angle, the larger the casing Mises stress of the casing, and the smaller the inner diameter of deformated casing. This study can provide a reference for the prevention of casing shear deformation caused by fault slip.

10.6056/dkyqt202106007