Numerical simulation of convective stability of the short-term storage of CO_2 saline aquifers

摘要

In this paper, inertial effects, mass interface and mass transfer mechanism are taken into account. By applying an updated space and time conservation element and solution element (CE/SE) method and hybrid particle level-set method, the stability simulation of the density-driven convection in deep saline aquifers is presented for short-term storage of CO_2. The mass transfer equations coupled with two phase fluid flow equations are solved numerically to investigate effects of CO_2 dissolution into brine on migration. Results show that Taylor instability phenomenon has been observed in CO_2 storage in saline aquifers for short time scales, which contributes to the further dissolution of CO_2 in saline aquifers. Density-driven convection dominates hydrodynamic trapping, while dissolution process of CO_2 also has a great influence on CO_2 sequestration.