The Numerical Simulation Calculation of Complicated In-Situ Stress Filed for Borehole Surrounding Rock

In order to accurately simulate the distribution of complicated in-situ stress filed of reservoir using the method of numerical simulation. In this paper, firstly, we have established the injection-production pore pressure model around refracturing well using potential additive principle; secondly, we have established primary fracture induced stress field model, considering that the weakly compressible fluid is filled with the injection-production primary fracture and introducing the elastic coefficient of fluid; finally, we have calculated the distribution of stress around a production well using ANASYS software. The calculating result is accurate and agrees well with practical ones. This method can solve the problem of calculating complicated in-situ stress filed using analytical method, and provides a new method for the subsequent study of stress field.