张杰城, 杜鑫芳, 赫文豪, 张来斌. 热-流耦合与热-流-固耦合作用下的水气交替及间歇注入对咸水层CO2溶解封存的影响[J]. 华南师范大学学报(自然科学版), 2024, 56(1): 9-17. doi: 10.6054/j.jscnun.2024002
引用本文: 张杰城, 杜鑫芳, 赫文豪, 张来斌. 热-流耦合与热-流-固耦合作用下的水气交替及间歇注入对咸水层CO2溶解封存的影响[J]. 华南师范大学学报(自然科学版), 2024, 56(1): 9-17. doi: 10.6054/j.jscnun.2024002
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
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

热-流耦合与热-流-固耦合作用下的水气交替及间歇注入对咸水层CO2溶解封存的影响

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

  • 摘要: 基于TOUGH+软件架构,结合更为准确的物理性质计算模型,建立了适用于咸水层CO2封存的热-流耦合模拟方法,并使用固定应力分割迭代耦合模型将其与RGMS软件耦合,改进了热-流-固双向耦合模拟方法,建立了准确性更高的热-流-固迭代耦合模拟方法。基于鄂尔多斯盆地地质特征构建的地质模型,使用热-流与热-流-固迭代耦合方法模拟咸水层CO2溶解封存过程,研究了水气交替及间歇注入方案对CO2溶解量、孔隙压力和地层形变的影响。结果表明:热-流-固迭代耦合模拟能帮助设计更加合理的注入方案;仅用水气交替注入方式可提高CO2溶解量;间歇注入有助于孔隙压力与地层形变恢复。研究结果可为咸水层CO2溶解封存提供理论指导。

     

    Abstract: 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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