A Comprehensive Simulation Study of Physicochemical and Geochemical Interactions on Immiscible CO2-LSWAG Injection in Carbonates

Low-salinity water-alternating-CO2 (CO2-LSWAG) injection has been widely studied and employed due to its capability promote enhanced oil recovery (EOR). However, there is no consensus on the dominant mechanisms for in carbonates extreme complexity of oil–brine–rock interactions. This work proposes a comparative investigation physicochemical geochemical effects continuous CO2 CO2-LSWAG immiscible injections carbonate core. Simulations were carried out using PVT properties relative permeability experimental data from literature. A comparison SO42− Mg2+ as interpolant ions, oil, water gas production, pressure, rock fluid along core effluent was made. The results show high factor (62%) (85%), even conditions. mineral dissolution porosity variations more pronounced than CO2. simulation showed that an improves because concentration aqueous phase after LSW leads values, which are favorable.