Solubility trapping as a potential secondary mechanism for CO2 sequestration during enhanced gas recovery by CO2 injection in conventional natural gas reservoirs : an experimental approach

Abba, MK; Abbas, AJ; Nasr, GG; Athari, A; Burby, ML; Saidu, B; Suleiman, SM

Abstract

This study aims to experimentally investigate the potential of solubility trapping mechanism in increasing CO2 storage during EGR by CO2 injection and sequestration in conventional natural gas reservoirs. A laboratory core flooding process was carried out to simulate EGR on a sandstone core at 0, 5, 10 wt% NaCl formation water salinity at 1300 psig, 50 °C and 0.3 ml/min injection rate. The results show that CO2 storage capacity was improved significantly when solubility trapping was considered. Lower connate water salinities (0 and 5 wt%) showed higher CO2 solubility from IFT measurements. With 10% connate water salinity, the highest accumulation of the CO2 in the reservoir was realised with about 63% of the total CO2 injected stored; an indication of improved storage capacity. Therefore, solubility trapping can potentially increase the CO2 storage capacity of the gas reservoir by serving as a secondary trapping mechanism in addition to the primary structural and stratigraphic trapping and improving CH4 recovery.

Citation

Abba, M., Abbas, A., Nasr, G., Athari, A., Burby, M., Saidu, B., & Suleiman, S. (2019). Solubility trapping as a potential secondary mechanism for CO2 sequestration during enhanced gas recovery by CO2 injection in conventional natural gas reservoirs : an experimental approach. Journal of Natural Gas Science and Engineering, 71(103002), https://doi.org/10.1016/j.jngse.2019.103002

• Journal Article Type: Article
• Acceptance Date: Sep 17, 2019
• Online Publication Date: Sep 23, 2019
• Publication Date: Nov 1, 2019
• Deposit Date: Oct 2, 2019
• Publicly Available Date: Sep 23, 2020
• Journal: Journal of Natural Gas Science and Engineering
• Print ISSN: 1875-5100
• Publisher: Elsevier
• Volume: 71
• Issue: 103002
• DOI: https://doi.org/10.1016/j.jngse.2019.103002
• Publisher URL: https://doi.org/10.1016/j.jngse.2019.103002
• Related Public URLs: https://www.sciencedirect.com/journal/journal-of-natural-gas-science-and-engineering