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  2023, Vol. 42 Issue (S1): 3496-3507    DOI: 10.13722/j.cnki.jrme.2022.0652
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Numerical simulation of multi-cluster fractures propagation in naturally fractured shale reservoir based on finite element method-discrete #br# fracture network
ZHU Haiyan,HUANG Chuhao,TANG Xuanhe
(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,
Chengdu,Sichuan 610059,China)
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Abstract  To effectively simulate the random propagation of hydraulic fractures and accurately describe the tensile,shear and mixed damage behaviour in naturally fractured shale reservoirs,a finite element method-discrete fracture network model coupled with seepage-stress-damage is established. The viscosity-dominated analytical model is utilized to verify the accuracy of the model. The effect of the approach angle,cluster spacing,horizontal stress difference and pumping rate on multi-cluster fractures propagation is investigated and the interaction mechanism between hydraulic and natural fractures is discussed. The results show that:(1) There are three main interaction mechanisms between hydraulic fracture and natural fracture: crossing through natural fracture,opening natural fracture and arrested by natural fracture;(2) With the increase of the approach angle,the natural fracture is easier to deflect the propagation direction of hydraulic fracture and even prevent the propagation of hydraulic fracture;(3) The increase of cluster spacing,horizontal stress difference and pumping rate can promote the uniform growth of multi-cluster fractures to a certain extent. The model can more accurately describe the propagation behaviour of multi-cluster fractures,and provide a new method for numerical simulation of hydraulic fracturing in naturally fractured shale reservoir.
Key wordsrock mechanics      propagation of multi-cluster fractures      finite element method-discrete fracture network      seepage-stress-damage      interaction mechanism      naturally fractured shale reservoir     
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ZHU Haiyan
HUANG Chuhao
TANG Xuanhe
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ZHU Haiyan,HUANG Chuhao,TANG Xuanhe. Numerical simulation of multi-cluster fractures propagation in naturally fractured shale reservoir based on finite element method-discrete #br# fracture network[J]. , 2023, 42(S1): 3496-3507.
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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0652      OR      https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3496
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