ANSYS软件在注水井套损预测中的应用

注水井泄压过程中的套损问题是油田开发中遇到的棘手难题。通过对基本方程及定解条件的比较，将ANSYS软件中温度场和应力场的直接耦合分析方法应用于注水井泄压中地层-套管-水泥环系统的渗流-应力耦合分析中。通过数值模拟，研究了不同条件下地层渗流场、应力场及套管挤压力变化规律，给出了套管挤压力的计算模板。

APPLICATION OF ANSYS IN FORECASTING OF WATER INJECTION WELL CASING DAMAGE

Casing damage during water injection well blowout is general in petroleum engineering, and it is difficult to resolve in many oil fields of China. In order to study the mechanism of the problem, fluid-solid coupled model is set up. According to the fundamental equations and boundary conditions, the ANSYS function of temperature field analysis is similar to that of seepage flow field. Based on the similarity of the formulas between the temperature field and fluid field, the coupling element between temperature and stress-Solid 5 Module in ANSYS program is employed to analyze the fluid and pressure coupling in. the strata-casing-cement system. The method can solve the seepage flow problem of complex boundaries and mediums. By means of numerical simulation, the fluid field in the strata and the relation between casing extrusion stress and pressure releasing rate are studied. The simulation results show that, the bigger permeability, the bigger extrusion pressure of casing damage as the same relief discharge.