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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
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,...
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Published in: | Journal of natural gas science and engineering 2019-11, Vol.71, p.103002, Article 103002 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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.
•The presence of connate water in gas reservoirs increases the storage capacity by exploiting solubility trapping mechanism.•IFT between CO2 and brines decreases considerably at 1300 psig and 50°C due to mass transfer between the phases.•Higher storage capacity of gas reservoirs seen with higher connate salinity is as result of narrower pore matrix plugging.•· Solubility trapping during EGR by CO2 injection in conventional gas reservoirs is promising with significant CH4 recovery. |
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ISSN: | 1875-5100 |
DOI: | 10.1016/j.jngse.2019.103002 |