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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摘要为高效、准确模拟不同类型天然裂缝发育致密储层中裂缝扩展，基于嵌入式网格的流–固全耦合数模方法，采用时间步自适应调整策略，提高主缝扩展效率；利用能量释放率方法，考虑强胶结天然裂缝作用；应用损伤模型模拟弱胶结天然裂缝激活，探讨不同类型天然裂缝对水力裂缝扩展规律影响。研究表明：(1) 时间步调整策略可以提高主缝的50%扩展求解效率。(2) 如果强胶结天然裂缝走向较为一致，推荐向垂直或平行于天然裂缝方向适当调整进行压裂，可降低并排井间发生压窜现象的概率，适合密切割压裂。(3) 在小尺度上，水力裂缝形态和流体压力场受弱胶结天然裂缝分布影响较大。此外，弱胶结天然裂缝影响基质岩石抗拉强度，抗拉强度越低，主裂缝周围形成改造体积越大，滤失作用增强，导致主裂缝长度降低。(4) 在大尺度上，不同胶结强度天然裂缝均存在且发育时，水力裂缝更倾向于形成弯曲主裂缝＋破碎带。该方法为裂缝性致密储层压裂模拟、工艺优化提供高效途径。

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	徐世乾1
	郭建春1
	YOUNIS Rami2
	卢聪1

关键词 ：岩石力学, 致密储层, 天然裂缝, 裂缝扩展, 损伤模型, 嵌入离散裂缝

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

引用本文:

徐世乾1，郭建春1，YOUNIS Rami2，卢聪1. 基于嵌入式网格的裂缝性致密储层裂缝扩展模[J]. 岩石力学与工程学报, 2025, 44(S1): 89-100.
XU Shiqian1，GUO Jiangchun1，YOUNIS Rami2，LU Cong1. Simulation method of fracture propagation in fractured tight reservoir based on embedded mesh. , 2025, 44(S1): 89-100.

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

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