Carbon dioxide geological sequestration is a key measure for mitigating global warming and enhancing oil recovery, and this process typically involves three-phase (oil, water, and carbon dioxide) displacement in porous media. In this study, a three-phase two-dimensional lattice Boltzmann method is employed to simulate the displacement process in large pore structures formed by splicing multiple actual pore structures. The model is validated through Janus droplet simulations. Using the aforementioned method, the three-phase dynamic behaviors and displacement processes are investigated, and gas flooding simulations are conducted on the basis of oil-water two-phase structures generated by experiments.
 

Lattice Boltzmann method, Three-phase displacement, porous media, pore-scale flow behaviors, Oil recovery