Optimization of EOR-CCS Core Flooding Experiments Using Taguchi DOE and Regression Analysis

objectives higher injection rates increased oil recovery, whereas lower rates favored CO₂ storage. The WAG ratio had a limited effect on oil recovery but consistently enhanced CO₂ storage, particularly at a 1:2 ratio. Salinity demonstrated a secondary yet positive influence, improving the overall performance, while pressure showed the least noticeable impact. Statistical ranking identified the injection rate as the most influential parameter, followed by salinity, WAG ratio, and pressure. Both the injection rate and WAG ratio were found to have a strong impact on responses. According to the OPI-based optimization results, the most favorable operating conditions were an injection rate of 0.15 mL/min, pressure of 850 psi, salinity of 30,000 ppm, and a WAG ratio of 1:2. In addition, predictive regression models forecasted oil recovery and CO₂ storage across different operating conditions, offering valuable guidance for future experiments and field applications. Overall, the findings highlight the significance of injection rate and WAG ratio in determining immiscible WAG performance, offering practical insights for enhancing EOR-CCS optimization.