Horizontal wells and multi-stage hydraulic fracturing technology make it possible for large-scale commercial exploitation of shale gas. However, the problem of casing deformation of horizontal wells in Sichuan shale gas field has become increasingly prominent, and the Fracturing tools can not be smoothly put to the designed positions. These problems have caused many sections of horizontal wells to be unable to carry out normal fracturing, which has seriously affected the efficient development of shale gas. Field statistics and previous literature studies show that the casing failure mode of Weiyuan shale gas field is shear deformation, and the shear load caused by fault slip is the main factor causing casing deformation. However, the deformation of casing under displacement shear load is still uncertain. The shear deformation experiment of casing is completed , and the strength change law of casing under shear load is obtained. On this basis, the numerical model of wellbore deformation under the action of fault interface slip is established, and the deformation of casing under the action of fault slip and related influencing factors are analyzed. The casing shear test and numerical simulation results are consistent. The results show that there is a linear positive correlation between formation slip and casing deformation. The fault angle, that is, the angle between the fault plane and the wellbore, has a great influence on the deformation of the casing. When the angle is 90 °, the casing deformation is the largest. Reducing the elastic modulus of cementing cement stone is beneficial to reduce the casing deformation. The research results can lay a theoretical foundation for the prevention and control of shale gas well casing deformation.

水平井和多级水力压裂技术使页岩气的大规模商业开发成为可能。但是，四川页岩气田水平井套管变形问题日益突出，压裂工具无法平稳地放置到设计位置。这些问题使许多水平井段无法进行正常压裂，严重影响了页岩气的有效开发。现场统计和以往的研究表明，威远页岩气田套管破坏模式为剪切变形，断层滑动引起的剪切载荷是引起套管变形的主要因素。但是，套管在位移剪切载荷作用下的变形仍不确定。完成了套管的剪切变形试验，得到了套管在剪切载荷作用下的强度变化规律。在此基础上，建立了断层滑动作用下井筒变形的数值模型，分析了断层滑动作用下套管的变形及相关影响因素。套管剪切试验与数值模拟结果一致。结果表明，地层滑动与套管变形之间存在线性正相关关系。断层角，即断层平面和井眼之间的角度，对套管的变形有很大的影响。当角度为90°时，套管变形最大。降低胶结水泥石的弹性模量有利于减少套管变形。