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An evaluation index for the fracturing effect in shale based on laboratory testing

机译：基于实验室测试的页岩压裂效果评价指标

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It is clear that evaluating the fracturing effect with laboratory tests can shed some light on designing fracturing programs for shale gas exploitation. To evaluate the fracturing effect quantitatively, a series of uniaxial cyclic loading tests on shale were conducted. Based on the experimental results, a damage variable derived from the total axial strains of the loading-unloading cycles was established and introduced into a damage evolution equation to analyze damage evolution in the shale. In the end, a new index for evaluating the fracturing effect, C-AN', was proposed. The results show that C-AN' has a positive correlation with fracture complexity and can be regarded as an effective index to evaluate fracture networks in shale using laboratory tests. In addition, this study demonstrates that the fracturing effect is also related to the angle between the direction in which the load is applied and the shale's bedding plane. This can provide a useful reference for shale gas exploitation.
机译：显然，通过实验室测试评估压裂效果可以为设计页岩气开采压裂程序提供一些启示。为了定量评价压裂效果，对页岩进行了一系列单轴循环荷载试验。根据实验结果，建立了由加载/卸载循环的总轴向应变得出的损伤变量，并将其引入到损伤演化方程中，以分析页岩中的损伤演化。最后，提出了评价压裂效果的新指标C-AN'。结果表明，C-AN'与裂缝复杂度呈正相关，可以作为通过实验室测试评估页岩裂缝网络的有效指标。此外，这项研究表明，压裂效果还与施加载荷的方向与页岩的顺层平面之间的夹角有关。这可以为页岩气的开采提供有用的参考。

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