Co-Optimization of CO2 Storage and Enhanced Gas Recovery Using Carbonated Water and Supercritical CO2

CO2-based enhanced gas recovery (EGR) is an appealing method with the dual benefit of improving from mature reservoirs and storing CO2 in subsurface, thereby reducing net emissions. However, injection for EGR has drawback excessive mixing methane gas, therefore, quality produced leading to early breakthrough CO2. Although this issue been identified as a major obstacle EGR, few strategies have suggested mitigate problem. We propose novel hybrid that involves slug carbonated water before beginning injection. While still ensuring storage, hinders CO2-methane reduces mobility, therefore delaying breakthrough. use reservoir simulation assess feasibility proposed method. Through structured design experiments (DoE) framework, we perform sensitivity analysis, uncertainty assessment, optimization identify ideal operation transition conditions. Results show only requires small amount injected up 3% pore volumes. This scheme mainly influenced by heterogeneity reservoir, volume injected, production rates. Monte Carlo simulations, demonstrate high factors storage ratios can be achieved while keeping recycled low.