Casing deformation occurs frequently in shale gas wells, resulting in the failure of some fracturing stages to complete normal operations, which seriously affects shale gas production. This paper firstly analyzes the casing deformation mechanism of shale gas wells and determines that the casing shear deformation caused by formation slip is the main factor of casing deformation. In order to solve the problem of casing shear deformation, a finite element numerical model including the formation, cement ring, and the casing is established. The casing shear deformation caused by formation slip is simulated, and the deformation results obtained are consistent with those measured in the actual wellbore. Based on the numerical model, a casing deformation governance method is proposed to optimize the wellbore trajectory and adjust the cement ring properties. It is calculated that reducing the dip angle α of the formation and casing vertical direction and reducing the formation slip is beneficial to reducing casing deformation. The use of low elastic modulus cement and uncementing operations can provide a buffer space for formation slip, effectively reduce casing deformation, and provide an effective treatment method for shear deformation of shale gas wells.

页岩气井套管变形频繁发生，导致部分压裂阶段无法完成正常作业，严重影响页岩气产量。本文首先分析了页岩气井套管变形机理，确定地层滑移引起的套管剪切变形是套管变形的主要因素。为了解决套管剪切变形问题，建立了包括地层、水泥环和套管的有限元数值模型。对地层滑移引起的套管剪切变形进行了模拟，得到的变形结果与实际井筒实测结果一致。基于数值模型，提出了套管变形治理方法，以优化井眼轨迹并调整水泥环性能。经计算，减小地层与套管垂直方向的倾角α，减小地层滑移，有利于减少套管变形。采用低弹性模量水泥和解固井作业，可为地层滑移提供缓冲空间，有效减少套管变形，为页岩气井剪切变形提供有效的处理方法。