基于弥散式裂缝模型的水力压裂研究

doi:10.13722/j.cnki.jrme.2014.0478

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摘要针对水力压裂数值模拟中传统分离式裂缝模型计算量大、需要预置裂缝及扩展路径等缺点，提出采用弥散式裂缝模型模拟水力压裂过程的解决办法，并根据流–固耦合理论，导出基于弥散裂缝的应力–渗流耦合方程，从而为实现在大尺度储层中模拟裂隙网络的演化提供参考。对混凝土试样进行水力压裂试验研究和基于弥散裂缝的数值分析，由2种方法得到的起裂值基本一致；试验和数值分析中，裂缝扩展主要受地应力影响，其方向垂直于水平最小地应力方向，最后在试件内形成主裂缝并贯穿整个试件。

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关键词 ：岩石力学, 水力压裂, 弥散式裂缝, 流&ndash, 固耦合, 起裂压力, 扩展方向

Abstract：：Considering the disadvantage of huge calculation，preset cracks and the growth path for the traditional discrete crack model for hydraulic fracturing numerical simulation，this paper proposed a solution to simulate hydraulic fracturing using smeared crack model，and provided reference for realizing the simulation of the fracture network evolution on large scales. According to the theory of solid-fluid coupling，the stress and fluid flow control equations based on the smeared crack model were established. Hydraulic fracturing process of concrete was analyzed by both test method and numerical method based on smeared fracture model. The initiation fracture pressure in the two methods was almost the same. Both in experimental and numerical analysis，the propagation of fracture was mainly influenced by the in-situ stress，and the direction of propagation was perpendicular to the horizontal minimum in-situ stress direction. Finally，a major fracture was formed in the specimen，and ran through the whole specimen.

Key words： rock mechanics hydraulic fracturing smeared crack solid-fluid coupling initial crack pressure direction of propagation

引用本文:

赵鹏1，2，谢凌志1，2，杨春和3，郭印同3. 基于弥散式裂缝模型的水力压裂研究[J]. 岩石力学与工程学报, 2015, 34(s1): 2593-2600.
ZHAO Peng1，2，XIE Lingzhi1，2，YANG Chunhe3，GUO Yintong3. RESEARCH ON HYDRAULIC FRACTURING BASED ON SMEARED CRACK MODEL. , 2015, 34(s1): 2593-2600.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0478 或 http://www.rockmech.org/CN/Y2015/V34/Is1/2593

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