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A criterion for identifying hydraulic fractures crossing natural fractures in 3D space

机译：确定3D空间中与自然裂缝相交的水力裂缝的准则

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Based on the analysis of the stress fields near the hydraulic fracture tip and on the natural fracture surface, a criterion for identifying hydraulic fractures crossing natural fractures was proposed. A series of hydraulic fracturing tests were conducted to investigate the influences of natural fractures occurrence and horizontal stress contrast on hydraulic fracture propagation using large scale tri-axial fracturing system. The experiment results showed that the crossing happens in the region with high approaching angle and strike angle, large horizontal stresses and horizontal stress difference coefficient. Horizontal stress contrast has a critical value, only when it is above the critical value, may the hydraulic fracture cross the natural fracture. These experimental results agree with the predictions of this criterion well. It is predicted by this criterion that the hydraulic fracture of a test well in the Longmaxi shale formation, Sichuan Basin, can't cross the natural fracture, which agrees with the micro-seismic monitoring results.
机译：在分析水力压裂尖端附近和自然裂缝表面应力场的基础上，提出了识别水力压裂穿越自然裂缝的判据。进行了一系列水力压裂试验，以研究使用大型三轴压裂系统的自然裂缝的发生和水平应力对比对水力压裂扩展的影响。实验结果表明，交叉发生在接近角和走向角大，水平应力大，水平应力差系数大的区域。水平应力反差具有临界值，只有当其高于临界值时，水力裂缝才可以越过自然裂缝。这些实验结果与该标准的预测非常吻合。根据该判据预测，四川盆地龙马溪组页岩试井的水力压裂无法穿越自然裂缝，与微震监测结果吻合。

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