Abstract

The article presents the analytical model and calculation results on fracture growth in layered rock mass during blasting and hydraulic fracturing in oil reservoirs. The stress state of fractured elastic rock mass is found using 3D boundary element method. The influence of strength characteristics of layered rock mass on the shape, size and area of radial fractures is determined. The presence of a stronger layer in rock mass restrains cross sectional growth of induced fractures as compared with the existing fractures in surrounding rock mass, i.e. nonuniform fracture of rock mass along boreholes and probable oversizes are prevented in this case. It is possible to adjust the shape of fractures by changing distribution of an explosive along the borehole. During hydraulic fracturing, fractures propagate chiefly along a softer rock layer if present.

中文翻译：

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爆破和水力压裂过程中层状岩体中裂缝扩展的模拟

摘要

介绍了油藏爆破和水力压裂过程中层状岩体裂缝扩展的分析模型和计算结果。使用3D边界元方法求出破裂弹性岩体的应力状态。确定了层状岩体强度特性对径向裂缝形状、尺寸和面积的影响。与周围岩体中存在的裂缝相比，岩体中更强层的存在抑制了诱导裂缝的横截面增长，即在这种情况下防止了岩体沿钻孔的不均匀破裂和可能的超大尺寸。可以通过改变炸药沿钻孔的分布来调整裂缝的形状。在水力压裂过程中，裂缝主要沿着较软的岩层传播（如果存在）。