The use of CO2 for secondary oil recovery has become a crucial means to achieve emission reduction. However, the microscopic transport mechanisms of water-oil-CO2 during this process, as well as the regulations governing CaCO3 precipitation in porous media leading to pore clogging and reduced permeability, remain unclear. This experiment conducts a visualized study of CO2-oil-water percolation in homogeneous porous media, examining the impact of displacement factors such as flow rate on recovery. By coating calcium carbonate on glass slides and capillaries, the experiment observed that the coating increased the contact angle of the slides and reduced the capillary force in the capillaries. After five coatings, the thickness stabilized, laying the foundation for subsequent experiments. Next, the factors affecting oil recovery efficiency were explored. The results showed that within the experimental range, increasing the flow rate and simulating the formation environment with coatings enhanced oil recovery efficiency. Regarding CO2 sequestration, the study indicated that CO2 foam made with sodium carbonate solution exhibited good sequestration capabilities. Additionally, within the experimental range, higher buffer solution flow rates resulted in poorer CO2 sequestration. The impact of temperature on improving brine oil recovery was minimal within the experimental range.