Numerical Simulation of Hydraulic Fractures Intersecting Natural Fractures in Shale With Plastic Deformation

CAO Yuling; HE Qiangsheng; LIU Chuang

doi:10.21656/1000-0887.430300

Volume 44 Issue 6

Jun. 2023

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CAO Yuling, HE Qiangsheng, LIU Chuang. Numerical Simulation of Hydraulic Fractures Intersecting Natural Fractures in Shale With Plastic Deformation[J]. Applied Mathematics and Mechanics, 2023, 44(6): 679-693. doi: 10.21656/1000-0887.430300

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Numerical Simulation of Hydraulic Fractures Intersecting Natural Fractures in Shale With Plastic Deformation

doi: 10.21656/1000-0887.430300

College of Civil Engineering, Nanjing Tech University, Nanjing 211816, P.R.China

Received Date: 2022-09-29
Rev Recd Date: 2023-01-30
Publish Date: 2023-06-01

Abstract

Abstract

The plastic deformation and numerous natural joints of shale pose a great challenge for the prediction of the hydraulic fracture geometry extension. Based on the finite element method, a fully coupled numerical model for elastoplastic hydraulic fractures was established with natural fractures and bedding planes considered. The numerical model was validated with the KGD analytical solution and Blanton's curve. The numerical results show that, compared with the numerical model solution of linear elasticity, the hydraulic fractures are prone to enter the natural weak interface due to the rock plastic deformation. The rock plastic deformation area mainly lies in the reservoir layer during the fracture propagation. In the case of rock ductile damage, the hydraulic fracture is more likely to penetrate the bedding plane. Hydraulic fractures can directly penetrate natural fractures and bedding planes at high injection rates due to large driving forces. The study provides new insights in terms of hydraulic fracture extension in elastoplastic formations.
- elastoplastic formation,
- natural fracture,
- bedding plane,
- hydraulic fracture,
- fracture morphology

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References(54)

References

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