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Numerical simulation of the laws of fracture propagation of multi-hole linear co-directional hydraulic fracturing

机译：多孔线性共道液压压裂骨折骨折规律的数值模拟

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摘要

Directional rupture is one of the most important and most common problems related to rock breaking. The goal of directional rock breaking can be effectively achieved via multi-hole linear co-directional hydraulic fracturing. In this paper, the XSite software was utilized to verify the experimental results of multi-hole linear co-directional hydraulic fracturing., and its basic law is studied. The results indicate that the process of multi-hole linear co-directional hydraulic fracturing can be divided into four stages: water injection boost, hydraulic fracture initiation, and the unstable and stable propagation of hydraulic fracture. The stable expansion stage lasts longer and produces more microcracks than the unstable expansion stage. Due to the existence of the borehole-sealing device, the three-dimensional hydraulic fracture first initiates and expands along the axial direction in the bare borehole section, then extends along the axial direction in the non-bare hole section and finally expands along the axial direction in the rock mass without the borehole. The network formed by hydraulic fracture in rock is not a pure plane, but rather a curved spatial surface. The curved spatial surface passes through both the centre of the borehole and the axial direction relative to the borehole. Due to the boundary effect, the curved spatial surface goes toward the plane in which the maximum principal stress occurs. The local ground stress field is changed due to the initiation and propagation of hydraulic fractures. The propagation direction of the fractures between the fracturing boreholes will be deflected. A fracture propagation pressure that is greater than the minimum principle stress and a tension field that is induced in the leading edge of the fracture end, will aid to fracture intersection; as a result, the possibility of connecting the boreholes will increase.
机译：定向破裂是与岩石破碎有关的最重要和最常见的问题之一。通过多孔线性共定液压压裂，可以有效地实现定向岩断裂的目标。在本文中，利用了XSite软件来验证多孔线性共道液压压裂的实验结果。研究了其基本法。结果表明，多孔线性协同液压压裂过程可分为四个阶段：注水升压，液压断裂引发，液压骨折的不稳定且稳定的传播。稳定的膨胀阶段持续更长时间并产生比不稳定的膨胀阶段更多的微裂纹。由于钻孔密封装置的存在，三维液压裂缝首先在裸钻部分中沿轴向引发并膨胀，然后沿着非裸孔部分沿轴向延伸，最后沿轴向膨胀没有钻孔的岩石质量的方向。通过岩石中的液压骨折形成的网络不是纯平面，而是弯曲的空间表面。弯曲的空间表面通过钻孔的中心和相对于钻孔的轴向。由于边界效应，弯曲的空间表面朝向该平面朝向该平面发生在其中发生最大主应力。由于液压裂缝的启动和传播，局部地应力场变化。压裂钻孔之间的裂缝的传播方向将被偏转。骨折传播压力大于在骨折端的前缘诱导的最小原理应力和张力场，将有助于裂缝交叉口;结果，连接钻孔的可能性将增加。

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