地应力及原生裂隙对水力压裂起裂方向和起裂压力的影响

发布时间：2019-05-09 00:33

【摘要】：在理论计算水力压裂起裂压力和起裂方向的基础上,利用应力-渗流耦合数值模拟方法,研究了地应力和原生裂隙对水力压裂过程中裂纹起裂和扩展的影响,得出了起裂压力和扩展压力随侧压系数的变化趋势;对比分析了不含预制裂纹和含预制裂纹压裂模型的起裂压力和方向;探讨了含裂纹模型起裂转向的临界应力条件;最后,通过应力分析阐述了地应力和原生裂隙对水力压裂起裂的影响机理。
[Abstract]:Based on the theoretical calculation of the initiation pressure and direction of hydraulic fracturing, the effects of in-situ stress and primary fracture on crack initiation and propagation during hydraulic fracturing are studied by means of stress-seepage coupling numerical simulation method, and the stress-seepage coupling numerical simulation method is used to study the influence of in-situ stress and primary fracture on crack initiation and propagation. The variation trend of crack initiation pressure and expansion pressure with lateral pressure coefficient is obtained. The initiation pressure and direction of the fracture models without and without prefabricated cracks are compared and analyzed, and the critical stress conditions of the crack initiation steering in the model with cracks are discussed. Finally, the influence mechanism of in-situ stress and primary fracture on hydraulic fracturing initiation is expounded by stress analysis.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;重庆市能源投资集团科技有限责任公司;煤矿灾害动力学与控制国家重点实验室;
【基金】：重庆市前沿与应用基础研究资助项目(cstc2014jcyjjq0020);重庆市前沿与应用基础研究资助项目(cstc2015jcyj A1148)
【分类号】：TD712.6

【相似文献】