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为考察CO2地层注入过程中岩体中发生的热—流—固耦合现象,笔者借用R.Leiws等建立的可变形孔隙介质中非等温空气流和水流模型,但在其水连续性方程中加入了温度梯度引起的水分扩散项,研制出相应的热—水—气—应力耦合二维弹塑性有限元程序。针对一个假定的CO2深部地质埋置库模型,在一定的CO2注入速率和注入时间条件下进行了热—水—气—应力耦合数值模拟,考察了岩体中的位移、应力、气体流速、孔隙压力和温度的分布与变化。结果显示,CO2的注入对围岩中的位移和应力影响强烈。
In order to investigate the thermo-fluid-solid coupling phenomenon in rock mass during CO2 injection, we used the non-isothermal air flow and water flow model in deformable porous media established by R.Leiws et al., But added the water continuity equation The water diffusion caused by the temperature gradient was developed and the corresponding two-dimensional elasto-plastic finite element program of thermo-hydro-hydro-mechanical coupling was developed. For a hypothetical CO2 deep geologic reservoir model, the numerical simulation of thermo-hydro-mechanical-gas-mechanical coupling was carried out under a certain CO2 injection rate and injection time. The displacement, stress, gas flow rate, porosity Pressure and temperature distribution and changes. The results show that the injection of CO2 has a strong influence on the displacement and stress in the surrounding rock.