Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media
In order to investigate the stress-sensitive characteristics of fracture networks under reservoir actual stress condition and its influence on the seepage in fractured porous media, we carried out permeability tests on experimental models with fracture networks under constant-volume boundary conditi...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/7433547 |
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| _version_ | 1832560595216367616 |
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| author | Yueli Feng Yuetian Liu Gang Lei |
| author_facet | Yueli Feng Yuetian Liu Gang Lei |
| author_sort | Yueli Feng |
| collection | DOAJ |
| description | In order to investigate the stress-sensitive characteristics of fracture networks under reservoir actual stress condition and its influence on the seepage in fractured porous media, we carried out permeability tests on experimental models with fracture networks under constant-volume boundary condition. In addition, a novel analytical stress-dependent permeability model of fracture networks in different directions was derived. Based on the test results and the proposed analytical model, the effects of various parameters (e.g., initial fracture aperture, fluid pressure, rock elastic modulus, effective-stress coefficient, and fracture dip) on deformation characteristics of fracture networks and the corresponding permeability tensor of fracture networks were studied. The research results show that, for a fractured porous media with a single group of fractures, the principal value of permeability is always parallel to the fracture-development direction. With increasing effective stress, the principal value of permeability decreases; however, the principal value direction remains unchanged. Moreover, for the fractured porous media with multiple sets of fractures, the principal direction of equivalent permeability will be inclined to the fractures with larger fracture aperture. Specifically, for the fractured porous media with two sets of intersecting fractures, the principal direction of equivalent permeability is parallel to the angular bisector of these two sets of intersecting fractures. Furthermore, the greater the difference of the fracture aperture change rate under effective stress, the more obvious the deviation of the permeability principal direction. The derived analytical model is of great theoretical and scientific significance to deepen the understanding of the stress-sensitive permeability of fractured reservoirs. |
| format | Article |
| id | doaj-art-4fe6048517794beda30daa3c86319dca |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-4fe6048517794beda30daa3c86319dca2025-02-03T01:27:07ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/74335477433547Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous MediaYueli Feng0Yuetian Liu1Gang Lei2State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, ChinaKing Fahd University of Petroleum & Minerals, College of Petroleum Engineering & Geosciences, Dhahran 31261, Saudi ArabiaIn order to investigate the stress-sensitive characteristics of fracture networks under reservoir actual stress condition and its influence on the seepage in fractured porous media, we carried out permeability tests on experimental models with fracture networks under constant-volume boundary condition. In addition, a novel analytical stress-dependent permeability model of fracture networks in different directions was derived. Based on the test results and the proposed analytical model, the effects of various parameters (e.g., initial fracture aperture, fluid pressure, rock elastic modulus, effective-stress coefficient, and fracture dip) on deformation characteristics of fracture networks and the corresponding permeability tensor of fracture networks were studied. The research results show that, for a fractured porous media with a single group of fractures, the principal value of permeability is always parallel to the fracture-development direction. With increasing effective stress, the principal value of permeability decreases; however, the principal value direction remains unchanged. Moreover, for the fractured porous media with multiple sets of fractures, the principal direction of equivalent permeability will be inclined to the fractures with larger fracture aperture. Specifically, for the fractured porous media with two sets of intersecting fractures, the principal direction of equivalent permeability is parallel to the angular bisector of these two sets of intersecting fractures. Furthermore, the greater the difference of the fracture aperture change rate under effective stress, the more obvious the deviation of the permeability principal direction. The derived analytical model is of great theoretical and scientific significance to deepen the understanding of the stress-sensitive permeability of fractured reservoirs.http://dx.doi.org/10.1155/2021/7433547 |
| spellingShingle | Yueli Feng Yuetian Liu Gang Lei Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media Geofluids |
| title | Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media |
| title_full | Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media |
| title_fullStr | Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media |
| title_full_unstemmed | Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media |
| title_short | Study on Stress-Dependent Permeability of Fracture Networks in Fractured Porous Media |
| title_sort | study on stress dependent permeability of fracture networks in fractured porous media |
| url | http://dx.doi.org/10.1155/2021/7433547 |
| work_keys_str_mv | AT yuelifeng studyonstressdependentpermeabilityoffracturenetworksinfracturedporousmedia AT yuetianliu studyonstressdependentpermeabilityoffracturenetworksinfracturedporousmedia AT ganglei studyonstressdependentpermeabilityoffracturenetworksinfracturedporousmedia |