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根据穿层钻孔水力压裂作用机理,运用数值模拟试验方法,对影响穿层钻孔的影响因素进行研究分析。结果表明:在试验模型参数下,起裂压力随煤层倾角增大而增大,当达到峰值后,又逐渐随角度增大而减小,综合破裂压力和压裂效果分析得水力压裂角度在45°~60°最优;随着煤体的变质程度的增加和均质度的增大,破裂压力也随之增大;侧压系数对煤体破裂压力的影响表现在煤体破裂压力主要受水平最小主应力的大小所决定。
According to the mechanism of hydraulic fracturing in borehole through borehole, numerical simulation test is used to analyze the influential factors of borehole drilling. The results show that the fracture initiation pressure increases with the increase of coal seam inclination under the experimental model parameters. When the peak angle is reached, the fracture pressure gradually decreases with the increase of the angle. According to the comprehensive fracture pressure and fracturing effect, the hydraulic fracturing angle 45 ° ~ 60 °. With the increase of coal metamorphic degree and homogeneity, the fracture pressure also increases. The effect of lateral pressure on rupture pressure of coal is mainly reflected in the rupture pressure of coal By the level of the minimum principal stress of the size of the decision.