(540f) Role of CO2 Adsorption for Enhanced Gas Recovery in Carbonate Rocks: Experimental and Simulation Analysis
AIChE Annual Meeting
Wednesday, November 10, 2021 - 4:35pm to 4:48pm
With increasing energy demand and consumption, the focus has shifted to natural gas which is a clean and environmentally friendly energy resource. Injecting carbon dioxide (CO2) for enhanced gas recovery (EGR) has gained more attention because of the dual benefit of increasing natural gas production and simultaneously sequestering CO2. The objective of this work is to address the role of CO2 adsorption on the efficiency of EGR in carbonate reservoirs based on lab experiments and modeling investigation. Limestone samples were used for the sorption experiments and the behavior of CO2/ methane (CH4) adsorption/desorption was simulated on calcite using molecular simulation. The obtained results showed that the CO2 adsorption increased and CH4 adsorption decreased as the temperature raised. No hysteresis was observed during the desorption stage indicating physisorption. The simulation results confirmed the lab observations of the physical adsorption behavior of CO2 and CH4 on the limestone surface suggesting that calcite preferential adsorbs CO2 over CH4.
Funding: This publication is made possible by grant NPRP10-0125-170235 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors.