A Casing Deformation Prediction Model Considering the Properties of Cement

A large amount of casing deformation has occurred in shale gas wells during the complex fracturing process, which affects construction and single well production. Based on statistical analysis caliper logging interpretation, main mechanism is revealed as formation slip. By comprehensively considering rotating speed under running condition, cement solidification heat release cementing fluid temperature drop safe service margin large. Moreover, simply increasing steel grade wall thickness no obvious effect prevention, so full wellbore prevention measures should be considered. using method unconventional oil string simulation test numerical simulation, mechanical response bridge plug resistance are analyzed. analyzing influence elastic modulus minimum drift diameter after shear deformation, an analytical model fracture slip established verified, provides technical support for parameter selection to prevent deformation.