注水井泄压对井壁围岩应力场的影响

注水井泄压过程中的套管损坏现象在中国许多油田十分普遍，根据油藏流体渗流与地应力场耦合作用理论，建立了套管承载计算的力学模型，利用有限元方法，通过数值模拟的手段研究了泄压过程中井壁围岩应力场的变化规律以及油层孔隙压力的变化规律。根据计算结果提出，控制注水井泄压流量是有效防治泄压过程中套损的一种有效手段，并给出了具体的计算方法，从而，为油田现场预防和减少套管损坏提供了理论依据。

Numerical simulation of geo-stress distribution during injecting well blowout

Casing damages during injecting well blowout have taken place commonly in many oil fields in China. In order to study the mechanism of the casing damage, fluid-solid coupled model to simulate casing stress and deformation is established; the numerical simulation based on the finite element method is also given. The simulation results show during the blowout process, the geo-stress around well-bore changes. At the beginning of the blowout, the tangent and radial stresses are big. The simulation results are very helpful to the casing protection in oil fields.