Enhancing CO2 Dissolution Storage and Analyzing Leakage Risks in CCUS Using Microfluidic Technology

Abstract In the process of CCUS, it is crucial to improve the efficiency of CO2 sequestration and analyze related leakage risks. This study aims to design experiments and evaluation methods using microfluidic and SEM technologies to investigate the effects of different agents on enhancing CO2 solubility storage under varying pore size conditions and to analyze the microscopic impacts of CO2 dissolution on rock minerals. The experimental results show that the addition of solubilizing agents reduces CO2 erosion, making dissolution less evident, and the resulting mineral precipitates fill some of the pores, reducing CO2 leakage paths. Triethanolamine exhibits a more significant solubilizing effect at higher pressures, while the effectiveness of solubilizing agents decreases with smaller pore diameters. Isopropyl citrate shows optimal solubilizing effects under low-pressure gaseous conditions. Under high-pressure supercritical conditions, smaller pores enhance the solubilizing effect, reaching up to 201.9%.