Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study
Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolutio...
Ausführliche Beschreibung
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Luo, Peng [verfasserIn] |
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2023 |
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© Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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Enthalten in: Bulletin of engineering geology and the environment - Springer Berlin Heidelberg, 1998, 82(2023), 7 vom: 22. Juni |
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Übergeordnetes Werk: |
volume:82 ; year:2023 ; number:7 ; day:22 ; month:06 |
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DOI / URN: |
10.1007/s10064-023-03322-0 |
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Katalog-ID: |
OLC214403351X |
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520 | |a Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. | ||
650 | 4 | |a CO | |
650 | 4 | |a geological sequestration | |
650 | 4 | |a CO | |
650 | 4 | |a leakage | |
650 | 4 | |a CO | |
650 | 4 | |a -water-coal interactions | |
650 | 4 | |a Fractal dimension of tortuosity | |
650 | 4 | |a Preferential flow pathways | |
700 | 1 | |a Zhang, Zhenyu |0 (orcid)0000-0002-2309-3145 |4 aut | |
700 | 1 | |a Zhang, Lei |4 aut | |
700 | 1 | |a Liu, Xiaoqian |4 aut | |
700 | 1 | |a Liu, Xiaobo |4 aut | |
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10.1007/s10064-023-03322-0 doi (DE-627)OLC214403351X (DE-He213)s10064-023-03322-0-p DE-627 ger DE-627 rakwb eng 550 600 VZ Luo, Peng verfasserin aut Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. CO geological sequestration CO leakage CO -water-coal interactions Fractal dimension of tortuosity Preferential flow pathways Zhang, Zhenyu (orcid)0000-0002-2309-3145 aut Zhang, Lei aut Liu, Xiaoqian aut Liu, Xiaobo aut Enthalten in Bulletin of engineering geology and the environment Springer Berlin Heidelberg, 1998 82(2023), 7 vom: 22. Juni (DE-627)24891880X (DE-600)1444574-8 (DE-576)068745818 1435-9529 nnns volume:82 year:2023 number:7 day:22 month:06 https://doi.org/10.1007/s10064-023-03322-0 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO AR 82 2023 7 22 06 |
spelling |
10.1007/s10064-023-03322-0 doi (DE-627)OLC214403351X (DE-He213)s10064-023-03322-0-p DE-627 ger DE-627 rakwb eng 550 600 VZ Luo, Peng verfasserin aut Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. CO geological sequestration CO leakage CO -water-coal interactions Fractal dimension of tortuosity Preferential flow pathways Zhang, Zhenyu (orcid)0000-0002-2309-3145 aut Zhang, Lei aut Liu, Xiaoqian aut Liu, Xiaobo aut Enthalten in Bulletin of engineering geology and the environment Springer Berlin Heidelberg, 1998 82(2023), 7 vom: 22. Juni (DE-627)24891880X (DE-600)1444574-8 (DE-576)068745818 1435-9529 nnns volume:82 year:2023 number:7 day:22 month:06 https://doi.org/10.1007/s10064-023-03322-0 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO AR 82 2023 7 22 06 |
allfields_unstemmed |
10.1007/s10064-023-03322-0 doi (DE-627)OLC214403351X (DE-He213)s10064-023-03322-0-p DE-627 ger DE-627 rakwb eng 550 600 VZ Luo, Peng verfasserin aut Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. CO geological sequestration CO leakage CO -water-coal interactions Fractal dimension of tortuosity Preferential flow pathways Zhang, Zhenyu (orcid)0000-0002-2309-3145 aut Zhang, Lei aut Liu, Xiaoqian aut Liu, Xiaobo aut Enthalten in Bulletin of engineering geology and the environment Springer Berlin Heidelberg, 1998 82(2023), 7 vom: 22. Juni (DE-627)24891880X (DE-600)1444574-8 (DE-576)068745818 1435-9529 nnns volume:82 year:2023 number:7 day:22 month:06 https://doi.org/10.1007/s10064-023-03322-0 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO AR 82 2023 7 22 06 |
allfieldsGer |
10.1007/s10064-023-03322-0 doi (DE-627)OLC214403351X (DE-He213)s10064-023-03322-0-p DE-627 ger DE-627 rakwb eng 550 600 VZ Luo, Peng verfasserin aut Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. CO geological sequestration CO leakage CO -water-coal interactions Fractal dimension of tortuosity Preferential flow pathways Zhang, Zhenyu (orcid)0000-0002-2309-3145 aut Zhang, Lei aut Liu, Xiaoqian aut Liu, Xiaobo aut Enthalten in Bulletin of engineering geology and the environment Springer Berlin Heidelberg, 1998 82(2023), 7 vom: 22. Juni (DE-627)24891880X (DE-600)1444574-8 (DE-576)068745818 1435-9529 nnns volume:82 year:2023 number:7 day:22 month:06 https://doi.org/10.1007/s10064-023-03322-0 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO AR 82 2023 7 22 06 |
allfieldsSound |
10.1007/s10064-023-03322-0 doi (DE-627)OLC214403351X (DE-He213)s10064-023-03322-0-p DE-627 ger DE-627 rakwb eng 550 600 VZ Luo, Peng verfasserin aut Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study 2023 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. CO geological sequestration CO leakage CO -water-coal interactions Fractal dimension of tortuosity Preferential flow pathways Zhang, Zhenyu (orcid)0000-0002-2309-3145 aut Zhang, Lei aut Liu, Xiaoqian aut Liu, Xiaobo aut Enthalten in Bulletin of engineering geology and the environment Springer Berlin Heidelberg, 1998 82(2023), 7 vom: 22. Juni (DE-627)24891880X (DE-600)1444574-8 (DE-576)068745818 1435-9529 nnns volume:82 year:2023 number:7 day:22 month:06 https://doi.org/10.1007/s10064-023-03322-0 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-GEO SSG-OPC-GGO SSG-OPC-GEO AR 82 2023 7 22 06 |
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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. 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Influence of different $ CO_{2} $ phase states on fluid flow pathways in coal: insights from image reconstruction and fractal study |
abstract |
Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
abstractGer |
Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
abstract_unstemmed |
Abstract The $ CO_{2} $ phase state changes during the long-term interaction with coal seams. A proper understanding of the influence of different $ CO_{2} $ phase states in water-bearing coal seams is of great significance in evaluating the leakage risk during $ CO_{2} $ sequestration. The evolution of fluid flow pathways in water-bearing coal subjected to the treatment of different $ CO_{2} $ phase states was investigated by using X-ray computed tomography (CT) technology, fractal dimension, and three-dimensional (3D) pore-scale flow modeling. The results show that the supercritical $ CO_{2} $ ($ ScCO_{2} $) treatment reduced the coal heterogeneity by 12.69% and increased the absolute permeability by 58.75%. Conversely, only 0.71% of coal heterogeneity reduction occurred after subcritical $ CO_{2} $ ($ SubCO_{2} $) treatment, increasing the absolute permeability by 24.91%. The reduction in the tortuosity fractal dimension after $ ScCO_{2} $ treatment was 2.69% larger than that of $ SubCO_{2} $ treatment, indicating that $ ScCO_{2} $ treatment was more favorable for improving the transport capacity of flow pathways. The pressure field distributions in the pore network model (PNM) were determined by coal heterogeneity and influenced by the number of flow pathways. The effect of $ ScCO_{2} $ treatment on the size, quantity, and location of preferential flow pathways in coal is more significant than that of $ SubCO_{2} $ treatment. Moreover, the proportion of preferential flow pathways in $ ScCO_{2} $-treated coal was less than 50%, much lower than that of the throats in PNMs. In contrast, the proportion of preferential flow pathways in $ SubCO_{2} $-treated coal was approximately 30% higher than that in $ ScCO_{2} $-treated coal. The distribution of preferential flow pathways also indicated that not all pores with larger radii participated in preferential flow. Furthermore, more than 50% of the pathways in the $ ScCO_{2} $-treated coal did not contribute to fluid flow, and could affect the stability of the coal seam. © Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
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