裂缝性页岩储层水力压裂多簇裂缝扩展的FEM-DFN数值模拟

doi:10.13722/j.cnki.jrme.2022.0652

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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 words： rock 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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	Articles by authors
	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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