Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR
Hydraulic fracturing in the immediate roof is a suitable method to increase the permeability of soft outburst coal seam. In this work, the propagation law of hydraulic fractures in laminated virgin sandstone and the change of microstructure after hydraulic fracturing were revealed. The results show...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/5716346 |
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| author | Kai Wang Xiang Zhang Haijun Guo Qiang Fu Dengke Wang Hang Zhang Fangchao Lu |
| author_facet | Kai Wang Xiang Zhang Haijun Guo Qiang Fu Dengke Wang Hang Zhang Fangchao Lu |
| author_sort | Kai Wang |
| collection | DOAJ |
| description | Hydraulic fracturing in the immediate roof is a suitable method to increase the permeability of soft outburst coal seam. In this work, the propagation law of hydraulic fractures in laminated virgin sandstone and the change of microstructure after hydraulic fracturing were revealed. The results show that the hydraulic fracturing pressure of sandstone with different bedding angles is 15.69~22.17 MPa. In the experiments, the hydraulic fractures extend through the bedding planes when the bedding angle is 45°. When the bedding angle is 0°, 15°, 30°, or 60°, the hydraulic fracture is prone to extend along a bedding plane. The hydraulic fracture in sandstone is jointly determined by the internal fractures and the cementation strengths of the bedding planes. The internal fractures may not necessarily guide the extension of the hydraulic fractures. The hydraulic fracturing pressures of the samples affected by the bedding plane and internal fractures are significantly lower than that of samples with uniform strength. Besides, hydraulic fracturing cannot change the connectivity between pores. The hydraulic fractures are the main channel for gas migration. The results can provide some guidance for the design and application of hydraulic fracturing in the immediate roof of the soft outburst coal seam. |
| format | Article |
| id | doaj-art-ad8e892ce90f4ce7b7121eaa5818e010 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-ad8e892ce90f4ce7b7121eaa5818e0102025-02-03T06:04:44ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/5716346Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMRKai Wang0Xiang Zhang1Haijun Guo2Qiang Fu3Dengke Wang4Hang Zhang5Fangchao Lu6School of Emergency Management and Safety EngineeringSchool of Emergency Management and Safety EngineeringSchool of Emergency Management and Safety EngineeringSchool of Emergency Management and Safety EngineeringState Key Laboratory Cultivation Base for Gas Geology and Gas ControlSchool of Safety Science and EngineeringSchool of Safety Science and EngineeringHydraulic fracturing in the immediate roof is a suitable method to increase the permeability of soft outburst coal seam. In this work, the propagation law of hydraulic fractures in laminated virgin sandstone and the change of microstructure after hydraulic fracturing were revealed. The results show that the hydraulic fracturing pressure of sandstone with different bedding angles is 15.69~22.17 MPa. In the experiments, the hydraulic fractures extend through the bedding planes when the bedding angle is 45°. When the bedding angle is 0°, 15°, 30°, or 60°, the hydraulic fracture is prone to extend along a bedding plane. The hydraulic fracture in sandstone is jointly determined by the internal fractures and the cementation strengths of the bedding planes. The internal fractures may not necessarily guide the extension of the hydraulic fractures. The hydraulic fracturing pressures of the samples affected by the bedding plane and internal fractures are significantly lower than that of samples with uniform strength. Besides, hydraulic fracturing cannot change the connectivity between pores. The hydraulic fractures are the main channel for gas migration. The results can provide some guidance for the design and application of hydraulic fracturing in the immediate roof of the soft outburst coal seam.http://dx.doi.org/10.1155/2022/5716346 |
| spellingShingle | Kai Wang Xiang Zhang Haijun Guo Qiang Fu Dengke Wang Hang Zhang Fangchao Lu Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR Geofluids |
| title | Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR |
| title_full | Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR |
| title_fullStr | Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR |
| title_full_unstemmed | Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR |
| title_short | Experimental Study on Hydraulic Fracturing of Laminated Sandstone Combined with Industrial CT and L-NMR |
| title_sort | experimental study on hydraulic fracturing of laminated sandstone combined with industrial ct and l nmr |
| url | http://dx.doi.org/10.1155/2022/5716346 |
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