Numerical Simulation of Sealing Failure of Cement Sheath in Perforated Section of Injection Well
Based on the method of fluid-solid coupling finite element numerical simulation,the failure range of cement sheath seals at different injection pressures,cement sheath elastic modulus and Poisson's ratio was simulated to show that,the offloading at high injection pressure will de-bond the cement sheath interface,reduce the mechanical properties of mudstone layer,increase the shear slip around injection well,and intensify the possibility of casing deformation there;the reduction of the elastic modulus of the cement sheath can reduce interface failure range of the cement sheath,and increase the injection pressure margin and improve the hydraulic sealing ability of the cement sheath;when the Poisson's ratio of cement to mud increases,the water pressure margin gradually increases,and the hydraulic sealing ability of the cement sheath gradually increases.Therefore,a higher Poisson's ratio cement sheath should be selected in cementing wells against the channeling.
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