Slip velocity dependence of friction-permeability response of shale fractures
Fluid injection-induced fracture slip during hydraulic stimulation of shales may be seismic or aseismic with the slip mode potentially influencing the evolution of permeability and subsequent shale gas production. We report a series of friction-permeability tests with constant and stepped velocities...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/159619 |
| _version_ | 1811680256692584448 |
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| author | Jia, Yunzhong Fang, Yi Elsworth, Derek Wu, Wei |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Jia, Yunzhong Fang, Yi Elsworth, Derek Wu, Wei |
| author_sort | Jia, Yunzhong |
| collection | NTU |
| description | Fluid injection-induced fracture slip during hydraulic stimulation of shales may be seismic or aseismic with the slip mode potentially influencing the evolution of permeability and subsequent shale gas production. We report a series of friction-permeability tests with constant and stepped velocities on planar saw-cut fractures of Longmaxi shale, Green River shale and Marcellus shale. In particular we explore the additive effect of stepped velocity on fracture permeability evolution relative to the background permeability driven at constant velocity. Fracture permeability decreases at larger slip displacement at constant velocity presumably due to asperity degradation and clay swelling. Sudden up-steps in slip velocity temporarily enhance fracture permeability as a result of shear dilation on hard minerals, but permeability net decreases with increasing slip displacement as wear products fill the pore space. Fracture surface roughness is the link between the fracture permeability and friction coefficient, which are both influenced by mineralogical composition. The fractures and sheared-off particles in the tectosilicate-rich and carbonate-rich shales dilate to increase fracture permeability, whereas asperity comminution readily occurs in the phyllosilicate-rich shale to reduce fracture permeability. The results potentially improve our ability to facilitate shale gas extraction and to mitigate the associated seismic risks. |
| first_indexed | 2024-10-01T03:22:10Z |
| format | Journal Article |
| id | ntu-10356/159619 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:22:10Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1596192022-06-29T04:20:03Z Slip velocity dependence of friction-permeability response of shale fractures Jia, Yunzhong Fang, Yi Elsworth, Derek Wu, Wei School of Civil and Environmental Engineering Engineering::Civil engineering Shale Fracture Frictional Slip Fluid injection-induced fracture slip during hydraulic stimulation of shales may be seismic or aseismic with the slip mode potentially influencing the evolution of permeability and subsequent shale gas production. We report a series of friction-permeability tests with constant and stepped velocities on planar saw-cut fractures of Longmaxi shale, Green River shale and Marcellus shale. In particular we explore the additive effect of stepped velocity on fracture permeability evolution relative to the background permeability driven at constant velocity. Fracture permeability decreases at larger slip displacement at constant velocity presumably due to asperity degradation and clay swelling. Sudden up-steps in slip velocity temporarily enhance fracture permeability as a result of shear dilation on hard minerals, but permeability net decreases with increasing slip displacement as wear products fill the pore space. Fracture surface roughness is the link between the fracture permeability and friction coefficient, which are both influenced by mineralogical composition. The fractures and sheared-off particles in the tectosilicate-rich and carbonate-rich shales dilate to increase fracture permeability, whereas asperity comminution readily occurs in the phyllosilicate-rich shale to reduce fracture permeability. The results potentially improve our ability to facilitate shale gas extraction and to mitigate the associated seismic risks. 2022-06-29T04:20:03Z 2022-06-29T04:20:03Z 2020 Journal Article Jia, Y., Fang, Y., Elsworth, D. & Wu, W. (2020). Slip velocity dependence of friction-permeability response of shale fractures. Rock Mechanics and Rock Engineering, 53(5), 2109-2121. https://dx.doi.org/10.1007/s00603-019-02036-8 0723-2632 https://hdl.handle.net/10356/159619 10.1007/s00603-019-02036-8 2-s2.0-85077060924 5 53 2109 2121 en Rock Mechanics and Rock Engineering © 2019 Springer-Verlag GmbH Austria, part of Springer Nature. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Shale Fracture Frictional Slip Jia, Yunzhong Fang, Yi Elsworth, Derek Wu, Wei Slip velocity dependence of friction-permeability response of shale fractures |
| title | Slip velocity dependence of friction-permeability response of shale fractures |
| title_full | Slip velocity dependence of friction-permeability response of shale fractures |
| title_fullStr | Slip velocity dependence of friction-permeability response of shale fractures |
| title_full_unstemmed | Slip velocity dependence of friction-permeability response of shale fractures |
| title_short | Slip velocity dependence of friction-permeability response of shale fractures |
| title_sort | slip velocity dependence of friction permeability response of shale fractures |
| topic | Engineering::Civil engineering Shale Fracture Frictional Slip |
| url | https://hdl.handle.net/10356/159619 |
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