Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models
In CO<sub>2</sub> geological storage, multiphase flow plays a vital role in the movement and distribution of CO<sub>2</sub>. However, due to the limitations of fluid buoyancy and capillary forces, CO<sub>2</sub> encounters challenges in penetrating the caprock, an...
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MDPI AG
2023-09-01
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| author | Bingfei Chu Guanhong Feng Yan Zhang Shengwen Qi Pushuang Li Tianming Huang |
| author_facet | Bingfei Chu Guanhong Feng Yan Zhang Shengwen Qi Pushuang Li Tianming Huang |
| author_sort | Bingfei Chu |
| collection | DOAJ |
| description | In CO<sub>2</sub> geological storage, multiphase flow plays a vital role in the movement and distribution of CO<sub>2</sub>. However, due to the limitations of fluid buoyancy and capillary forces, CO<sub>2</sub> encounters challenges in penetrating the caprock, and the potential for leakage remains a concern due to variations in injection conditions. The migration and distribution of CO<sub>2</sub> in the process of CO<sub>2</sub> geological storage in saline formations are determined by relative permeability and capillary pressure, which are key factors. Consequently, this study focuses on two essential models: relative permeability and capillary pressure models. A two-dimensional isothermal reservoir–caprock model was constructed, utilizing data from the Shenhua CCS demonstration project. The analysis indicates that the core parameters in the model are residual gas saturation and residual water saturation. Specifically, residual gas saturation governs the diffusion distance of CO<sub>2</sub> within the reservoir–caprock system, while its combined effect with residual water saturation affects the permeation rate of CO<sub>2</sub>. Through the application of the Analytic Hierarchy Process (AHP) to analyze the impact of different models on caprock integrity, it was determined that when selecting caprock models and optimizing parameters, precedence should be given to models with lower residual saturation and caprocks that offer sufficient capillary pressure for optimal sealing effects. These research findings can serve as references for practical CO<sub>2</sub> storage projects, providing guidance on activities such as adjusting water injection strategies and controlling gas injection pressures to optimize geological storage efficiency. |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T21:50:24Z |
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| series | Water |
| spelling | doaj.art-3c95aeb1f25b45ae898835bc7f4272682023-11-19T13:26:57ZengMDPI AGWater2073-44412023-09-011518331610.3390/w15183316Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure ModelsBingfei Chu0Guanhong Feng1Yan Zhang2Shengwen Qi3Pushuang Li4Tianming Huang5Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaSchool of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, ChinaKey Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, ChinaIn CO<sub>2</sub> geological storage, multiphase flow plays a vital role in the movement and distribution of CO<sub>2</sub>. However, due to the limitations of fluid buoyancy and capillary forces, CO<sub>2</sub> encounters challenges in penetrating the caprock, and the potential for leakage remains a concern due to variations in injection conditions. The migration and distribution of CO<sub>2</sub> in the process of CO<sub>2</sub> geological storage in saline formations are determined by relative permeability and capillary pressure, which are key factors. Consequently, this study focuses on two essential models: relative permeability and capillary pressure models. A two-dimensional isothermal reservoir–caprock model was constructed, utilizing data from the Shenhua CCS demonstration project. The analysis indicates that the core parameters in the model are residual gas saturation and residual water saturation. Specifically, residual gas saturation governs the diffusion distance of CO<sub>2</sub> within the reservoir–caprock system, while its combined effect with residual water saturation affects the permeation rate of CO<sub>2</sub>. Through the application of the Analytic Hierarchy Process (AHP) to analyze the impact of different models on caprock integrity, it was determined that when selecting caprock models and optimizing parameters, precedence should be given to models with lower residual saturation and caprocks that offer sufficient capillary pressure for optimal sealing effects. These research findings can serve as references for practical CO<sub>2</sub> storage projects, providing guidance on activities such as adjusting water injection strategies and controlling gas injection pressures to optimize geological storage efficiency.https://www.mdpi.com/2073-4441/15/18/3316CO<sub>2</sub> geological storagerelative permeability modelcapillary pressure modelmultiphase flowAHP |
| spellingShingle | Bingfei Chu Guanhong Feng Yan Zhang Shengwen Qi Pushuang Li Tianming Huang Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models Water CO<sub>2</sub> geological storage relative permeability model capillary pressure model multiphase flow AHP |
| title | Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models |
| title_full | Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models |
| title_fullStr | Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models |
| title_full_unstemmed | Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models |
| title_short | Residual Saturation Effects on CO<sub>2</sub> Migration and Caprock Sealing: A Study of Permeability and Capillary Pressure Models |
| title_sort | residual saturation effects on co sub 2 sub migration and caprock sealing a study of permeability and capillary pressure models |
| topic | CO<sub>2</sub> geological storage relative permeability model capillary pressure model multiphase flow AHP |
| url | https://www.mdpi.com/2073-4441/15/18/3316 |
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