Research on the Influence of Running Casing Technology on Casing Deformation Severity in Deep Shale Gas Wells

Abstract

In response to the challenge of casing deformation that restricts the development of deep shale gas, this study takes a typical deep shale gas well platform as the research object. By integrating theoretical analysis, numerical simulation, and full-scale physical experiments, the intrinsic relationship and mechanical response mechanism between casing buckling and deformation are systematically investigated. The research first conducts a mechanical analysis of casing installation, establishes a theoretical model for pipe string buckling, and preliminarily identifies the buckling configuration. The results indicate that buckling deformation is prone to occur at the bottom of the vertical well section and near point A. Subsequently, a spatial comparison between the measured deformation points of the casing and the theoretical buckling segments reveals a high coincidence rate of over 90%, confirming that buckling is the primary cause of casing deformation. To validate the theoretical findings, a full-scale physical experiment is designed and implemented, simulating buckling conditions by eccentrically placing the casing within the cement sheath. This further elucidates the mechanical transmission path from buckling to deformation. The research outcomes provide a theoretical basis for optimizing casing installation techniques in deep shale gas wells. By controlling the occurrence of buckling, the risk of casing deformation can be effectively mitigated, offering significant engineering value for ensuring the efficient development of shale gas resources.