Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs
Activating the natural fracture (NF) during hydraulic fracture (HF) propagation is a dominant factor for forming the complex fracture network in shale reservoirs. On basis of Renshaw and Pollard’s criterion for fracture intersection, we simulate the NF stability under dynamic disturbance of HF propa...
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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/10.1155/2022/2719869 |
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| _version_ | 1832558412155584512 |
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| author | Yuanqin Wu Xiangyi Yi Yuan Lu Ying Li |
| author_facet | Yuanqin Wu Xiangyi Yi Yuan Lu Ying Li |
| author_sort | Yuanqin Wu |
| collection | DOAJ |
| description | Activating the natural fracture (NF) during hydraulic fracture (HF) propagation is a dominant factor for forming the complex fracture network in shale reservoirs. On basis of Renshaw and Pollard’s criterion for fracture intersection, we simulate the NF stability under dynamic disturbance of HF propagation in shale reservoirs with the cohesive zone model in ABAQUS and analyze the effects of various factors on the NF stability. The results show that activation of the NFs in shale hydraulic fracturing is controlled by NF length, NF density, intersection angle between the NF and the HF, horizontal principal stress difference, frac fluid viscosity, and injection rate. During HF propagation, the NF shorter than 0.2 m is less likely to be activated, and those longer than 0.5 m are more likely to be activated. As the NF density increases, not all NFs are activated. The NF at an approach angle larger than 10° is more likely to be activated. The NF is more likely to be activated under the low stress difference, and the NF cannot be activated when the stress difference is higher than 10 MPa. Both frac fluid viscosity and injection rate have effects on activation of NFs, and the NF is more likely to be activated by higher viscosity frac fluid and under higher injection rate. The results provide reference for fracture network stimulation in shale reservoirs. |
| format | Article |
| id | doaj-art-c5b94405669540d88ade7cf39ed410a0 |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-c5b94405669540d88ade7cf39ed410a02025-02-03T01:32:27ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/2719869Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale ReservoirsYuanqin Wu0Xiangyi Yi1Yuan Lu2Ying Li3College of EnergyCollege of EnergyCollege of EnergyDownhole Service Co.Activating the natural fracture (NF) during hydraulic fracture (HF) propagation is a dominant factor for forming the complex fracture network in shale reservoirs. On basis of Renshaw and Pollard’s criterion for fracture intersection, we simulate the NF stability under dynamic disturbance of HF propagation in shale reservoirs with the cohesive zone model in ABAQUS and analyze the effects of various factors on the NF stability. The results show that activation of the NFs in shale hydraulic fracturing is controlled by NF length, NF density, intersection angle between the NF and the HF, horizontal principal stress difference, frac fluid viscosity, and injection rate. During HF propagation, the NF shorter than 0.2 m is less likely to be activated, and those longer than 0.5 m are more likely to be activated. As the NF density increases, not all NFs are activated. The NF at an approach angle larger than 10° is more likely to be activated. The NF is more likely to be activated under the low stress difference, and the NF cannot be activated when the stress difference is higher than 10 MPa. Both frac fluid viscosity and injection rate have effects on activation of NFs, and the NF is more likely to be activated by higher viscosity frac fluid and under higher injection rate. The results provide reference for fracture network stimulation in shale reservoirs.http://dx.doi.org/10.1155/2022/2719869 |
| spellingShingle | Yuanqin Wu Xiangyi Yi Yuan Lu Ying Li Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs Geofluids |
| title | Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs |
| title_full | Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs |
| title_fullStr | Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs |
| title_full_unstemmed | Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs |
| title_short | Stability of Natural Fractures under Disturbance of Hydraulic Fractures in Shale Reservoirs |
| title_sort | stability of natural fractures under disturbance of hydraulic fractures in shale reservoirs |
| url | http://dx.doi.org/10.1155/2022/2719869 |
| work_keys_str_mv | AT yuanqinwu stabilityofnaturalfracturesunderdisturbanceofhydraulicfracturesinshalereservoirs AT xiangyiyi stabilityofnaturalfracturesunderdisturbanceofhydraulicfracturesinshalereservoirs AT yuanlu stabilityofnaturalfracturesunderdisturbanceofhydraulicfracturesinshalereservoirs AT yingli stabilityofnaturalfracturesunderdisturbanceofhydraulicfracturesinshalereservoirs |