Experimental study on hydraulic fracture propagation behavior in heterogeneous shale formations

IF 2.6 4区 工程技术 Q3 ENERGY & FUELS Frontiers in Energy Research Pub Date : 2024-09-03 DOI:10.3389/fenrg.2023.1309591
Wang Bin, Jia Tao, Xu Binggui, Ning Kun, Tan Peng, Zhou Yi
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Abstract

The study of fracture propagation in heterogeneous shale is a crucial prerequisite for the investigation of heterogeneous cluster and perforation parameters optimization. In this paper, we conduct a physical simulation fracturing experiment on heterogeneous shale to investigate the effects of various influencing factors, such as shale bedding, near-wellbore fractures, lithological changes, and the presence of fractures surrounding the perforation hole, on fracture propagation law and morphology. Our research demonstrates that during shale fracturing, shear dislocation typically occurs between layers, resulting in the separation of different layer planes. The main fracture primarily propagates through layers in a stepped manner. The presence of sandstone in heterogeneous shale significantly impedes fracturing fractures, causing significant distortion and deviation. As the scale of natural fractures increases, it tends to cause the fracturing fracture to twist and change direction. The natural fractures network can also lead to the distortion of fracturing fractures, albeit to a lesser extent than large-scale natural fractures. The presence of micro fractures parallel to the perforation axis surrounding the perforation hole enhances the ability of the main fracturing fractures to pass through natural fractures.
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异质页岩层中水力压裂传播行为的实验研究
研究异质页岩中的裂缝传播是研究异质群和优化射孔参数的重要前提。本文对异质页岩进行了物理模拟压裂实验,研究了页岩层理、近井筒裂缝、岩性变化、射孔孔周围存在裂缝等多种影响因素对裂缝传播规律和形态的影响。我们的研究表明,在页岩压裂过程中,层间通常会发生剪切位错,导致不同层平面分离。主裂缝主要以阶梯方式在层间传播。异质页岩中砂岩的存在极大地阻碍了压裂裂缝的形成,造成了严重的扭曲和偏差。随着天然裂缝规模的扩大,往往会导致压裂裂缝扭曲和改变方向。天然裂缝网络也会导致压裂裂缝变形,但程度低于大规模天然裂缝。射孔孔周围存在平行于射孔轴线的微裂缝,增强了主压裂裂缝穿过天然裂缝的能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Energy Research
Frontiers in Energy Research Economics, Econometrics and Finance-Economics and Econometrics
CiteScore
3.90
自引率
11.80%
发文量
1727
审稿时长
12 weeks
期刊介绍: Frontiers in Energy Research makes use of the unique Frontiers platform for open-access publishing and research networking for scientists, which provides an equal opportunity to seek, share and create knowledge. The mission of Frontiers is to place publishing back in the hands of working scientists and to promote an interactive, fair, and efficient review process. Articles are peer-reviewed according to the Frontiers review guidelines, which evaluate manuscripts on objective editorial criteria
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