Remote hydraulic fracturing at weak interfaces

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Tao You , Keita Yoshioka
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引用次数: 0

Abstract

Many hydraulic fracturing experiments suggest that low-viscosity fluid tends to generate a complex fracture network, which may be beneficial for geo-energy production. However, the precise impacts of low-viscosity fluid on the fracture nucleation and propagation are unknown. This study focuses on the stress jump at weak interfaces (e.g., grain boundaries or natural fractures) caused by the contrast in Biot’s coefficient, which is prevalent in hard rocks, and how failure may develop. We found that fracture nucleation at weak interfaces becomes favorable under certain Biot’s coefficient contrast and fluid viscosity. Our numerical simulations of fluid injection through a borehole demonstrate that low-viscosity fluid injection can nucleate isolated fractures at remote interfaces without connecting to the main propagating fracture. These findings imply the necessity to consider Biot’s coefficient variations within a rock mass in applications such as hydraulic fracturing or induced seismicity, especially when a diffused pressure gradient persists due to the low-viscosity fluid.
弱界面远程水力压裂
许多水力压裂实验表明,低粘度流体倾向于生成复杂的裂缝网络,这可能有利于地质能源生产。然而,低粘度流体对裂缝成核和扩展的确切影响尚不清楚。本研究的重点是在坚硬岩石中普遍存在的由比奥特系数对比引起的弱界面(如晶界或天然裂缝)的应力跃迁,以及破坏是如何形成的。我们发现,在一定的比奥系数对比和流体粘度条件下,弱界面处的断裂成核变得有利。我们对通过井眼注入流体进行的数值模拟表明,低粘度流体注入可在偏远界面处形成孤立的断裂核,而不会与主传播断裂相连。这些发现表明,在水力压裂或诱发地震等应用中,尤其是在低粘度流体造成的扩散压力梯度持续存在的情况下,有必要考虑岩体内部的 Biot 系数变化。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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