基于互补算法的水力裂缝与天然裂缝相互作用边界元模型

doi:10.13722/j.cnki.jrme.2017.0938

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Abstract

Mechanical interaction between a hydraulic fracture and a natural fracture is a crucial issue for analyzing hydraulic fracture growth. The complementary constraints of natural fractures were derived from the deformation and stress state of natural fractures，then the mechanical model for solving interaction between a hydraulic fracture and a natural fracture was established based on boundary element method. The model was validated by the analytical solution of frictional cracks and the trial method for solving mechanical response of natural fractures. A case study was conducted based on a multi-staged fractured horizontal well of shale gas，and mechanical response characteristics were investigated by the new model. Results show that results calculated by the model are consistent with the microseismic measurement result. When a hydraulic fracture contacts with a natural fracture，the hydraulic fracture tip can be blunted. The natural fracture can be opened and slipped near the contact location，and slipping zone is larger than opening zone. When the approaching angle is larger than 60°，opening of the natural fracture is difficult to occur. The initiation location of a natural fracture is not coinciding with the contact location. The hydraulic fracture has more chances to penetrate the natural fracture under the condition of large approaching angle，net pressure and friction coefficient.

Key words： rock mechanics hydraulic fracturing displacement discontinuity method complementary method mechanical response slipping zone blunted tip

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	Articles by authors
	CHEN Ming1
	ZHANG Shicheng1
	XU Yun2
	MA Xinfang1
	ZOU Yushi1
	LI Ning1

Cite this article:

CHEN Ming1,ZHANG Shicheng1,XU Yun2, et al. Boundary element model for mechanical interaction between hydraulic fracture and natural fracture based on complementary algorithm[J]. , 2018, 37(S2): 3947-3957.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.0938 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3947

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