Study on the Causes of Casing Damage and Optimization of Injection and Mining Parameters Under Fluid-Structure Interaction in Typical Block

In the oilfield production process, when the load generated by the casing exceeds the bearing capacity of the casing due to engineering, geology, production and other changing factors, the casing will be deformed, ruptured, and misfractured. In this paper, a typical block is selected, starting from the coupling mechanism of seepage and deformation of reservoir rock, and the mathematical model of fluid-structure interaction in the formation-cement ring-casing combination system is first established, and the seepage field and stress field around the casing are analyzed, and the causes of casing damage based on fluid-structure interaction are determined. The influence of injection parameters on the force of casing was analyzed, and the relevant casing force plate was formed. According to the calculation results of seepage field and stress field during injection and production, analyze the force state of casing during injection and production, study the relationship between injection and casing stress, clarify the influence of injection and production parameters on casing stress, determine the boundary of injection and production parameters, and take timely measures in the production process to reduce the occurrence of casing damage and improve the service life of casing.