CO_2注入咸水层的动力弥散-对流-溶解计算模型

Model of dispersion-advection-solution for CO_2 injection into salty strata

如何模拟CO2注入咸水储层的质量传输过程是实施CO2注入地下咸水层的关键.通过分析CO2注入咸水储层的质量传输过程,基于质量守恒原理,建立考虑对流、动力弥散及溶解的计算模型,利用有限元法开发了相应的数值计算程序CO2-IA.数值算例研究地下水渗流速度对CO2注入的影响,结果表明:地下水渗流速度对CO2的质量传输影响很大,随着地下水渗流速度的增加,地下水的对流和弥散效能均增强,从而有效地提高了咸水层中CO2的封存量和封存效率.

To simulate the process of CO2 injection into salty aquifer is a key issue for CO2 injection operation.Mass transfer process of CO2 injection was analyzed in this study.Based on the mass conservation principle,the model of coupled dispersion-advection-solution for CO2 injection was also established.A numerical calculation program CO2-IA has been developed using finite element method.A numerical case is conducted to investigate the effect of groundwater velocity on CO2 injection.Main conclusions are obtained as follows:the groundwater velocity affects the mass transfer process of CO2.With the increment of velocity,the advection and dispersion are enhanced.Therefore,the mass and efficiency of CO2 injection can be improved.