Citation: | ZHANG Jiecheng, DU Xinfang, HE Wenhao, ZHANG Laibin. Impact of Water Alternating Gas and Intermittent Injection on CO2 Dissolution During CO2 Sequestration in Saline Aquifers Considering Thermal-Hydraulic Coupling and Thermal-Hydraulic-Mechanical Coupling Effects[J]. Journal of South China Normal University (Natural Science Edition), 2024, 56(1): 9-17. DOI: 10.6054/j.jscnun.2024002 |
Based on TOUGH+ and a more accurate physical property calculation model, a thermal-hydraulic coupling simulation method suitable for CO2 sequestration in saline aquifers is established. The method was further coupled with RGMS using the fixed-stress split iteration model, improved from the fixed-stress split two-way model, to obtain a more accurate thermal-hydraulic-mechanical iteratively coupling simulation method. Based on the geological characteristics of the Ordos Basin, a geological model is constructed, and the thermal-hydraulic and thermal-hydraulic-mechanical coupling simulation methods mentioned above are used to simulate the process of CO2 dissolution during CO2 sequestration in saline aquifers. The impacts of water alternating gas injection and intermittent injection schemes on CO2 dissolution, pore pressure, and formation deformation are investigated. The following results are found: the thermal-hydraulic-mechanical iteratively coupling model can better assist in designing more reasonable injection schemes; only water alternating gas injection can enhance CO2 dissolution; intermittent injection contributes to the recovery of pore pressure and formation deformation. The results can provide theoretical guidance for the CO2 sequestration in saline aquifers by CO2 dissolution.
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