基于嵌入式网格的裂缝性致密储层裂缝扩展模

doi:10.3724/1000-6915.jrme.2023.1099

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Abstract To efficiently and accurately simulate fracture propagation in tight reservoirs with different types of natural fractures，a fully coupled hydro-geomechanical model based on embedded mesh is adopted. A time step adaptive adjustment strategy is proposed to improve the efficiency of main fracture propagation. The energy release rate method is employed to consider the effect of strongly cemented natural fractures. The damage model is applied to simulate the activation of weakly cemented natural fractures. After that，the influence of different types of natural fractures on the fracture propagation is investigated. The results show that：(1) the time step adjustment strategy can improve the computational efficiency of main fracture propagation by 50%. (2) If the orientation of strongly cemented natural fractures is relatively consistent，it is recommended to adjust the fracturing direction perpendicular or parallel to the natural fracture orientation appropriately. It can help reduce the likelihood of inter-well interference，making it suitable for closely spaced multi-cluster fracturing. (3) On a small scale，the hydraulic fracture geometry and fluid pressure field are greatly affected by the distribution of weakly cemented natural fractures. In addition，these natural fractures affect the tensile strength of the matrix rock. The lower the tensile strength，the larger the stimulated reservoir volume，the stronger the fluid loss effect，and the shorter the main fracture length. (4) On a large scale，when natural fractures of different cementation strengths exist，hydraulic fractures tend to form curved main fractures with damage zones. The method provides an efficient tool for fracturing simulation and optimization in fractured tight reservoirs.

Key words： rock mechanics tight formation natural fracture fracture propagation damage model embedded discrete fracture

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	Articles by authors
	XU Shiqian1
	GUO Jiangchun1
	YOUNIS Rami2
	LU Cong1

Cite this article:

XU Shiqian1,GUO Jiangchun1,YOUNIS Rami2, et al. Simulation method of fracture propagation in fractured tight reservoir based on embedded mesh[J]. , 2025, 44(S1): 89-100.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2023.1099 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/IS1/89

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