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Experimental Study on Hydro-shearing Propagation of an Embedded Fracture in Hot Dry Granite Rock

机译：热干燥花岗岩岩石中嵌入式骨折水力剪切繁殖的实验研究

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Hydro-shearing fracturing has become a standard stimulation technique by activating pre-existing fractures for hot dry rock. Shear slip and dilation of pre-existing fractures are two primary propagation behaviors and enhance the fracture permeability and heat transfer. In this paper, we conducted a more realistic lab-scale experiment of hydro-shearing stimulation. Cool water was injected into an embedded rough fracture under in-situ confining pressure and temperature. We measured the injection flow rate and pressure, axial loading, and displacement in axial and radial in real time. The characteristics of fracture shear slip were obtained involving changes of slip distance, effective normal stress, shear stress, and water injection pressure with time. Experimental results show that fracture shear slip behaviors of hydro-shearing stimulation contains four stages: fracture initiation, slip weakening, stable sliding, and deceleration slip. The stable sliding is a dominant contributor to the total slip distance. Fracture initiation mode appears to be either tensile opening or shear slipping. Stick-slip and steady sliding are two possible shear slip behaviors. High Colombia ratio promotes to be tensile opening. The ultimate slip distance presents a positive correlation with the reduction of effective normal stress. This work provides more insights to understand the mechanics of hydro-shearing behaviors and primary influence factors.
机译：通过激活热干岩的预先存在的裂缝，水力剪切压裂已成为标准刺激技术。预先存在的骨折的剪切滑动和扩张是两个主要繁殖行为，增强骨折渗透率和传热。在本文中，我们进行了更现实的水力剪切刺激实验室规模实验。在原位限制压力和温度下，将冷水注入嵌入的粗糙骨折中。我们实时测量了轴向和径向的注射流量和压力，轴向载荷和位移。获得裂缝剪切滑动的特性，涉及具有时间的滑移距离，有效正常应力，剪切应力和水注入压力的变化。实验结果表明，水力剪切刺激的断裂剪切滑移行为含有四个阶段：断裂起始，滑移弱化，滑动和减速滑动。稳定的滑动是总滑移距离的主要贡献者。断裂启动模式似乎是拉伸开口或剪切滑动。粘滑和稳定滑动是两种可能的剪切滑动行为。高哥伦比亚的比例促进为拉伸开口。终极滑移距离与减少有效正常应力的阳性相关性。这项工作提供了更多见解，了解水力剪切行为和主要影响因素的机制。

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