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针对水力喷射布置方式影响页岩气开采压裂效果,建立了页岩气水平井水力喷射预制裂缝二维模型,利用数值模拟方法,考虑水力压裂压强、气藏埋深影响,分析了水力喷射布置方式、喷射角度对页岩气藏应力分布特征,给出了喷射布置类型、喷射角度对水力压裂影响面积,确定了最佳水力喷射布置方式.结果表明:相同水力压裂压强和采深下,对斜型、直斜型、单斜型三种水力喷射布置方式中,对斜型压裂效果最佳,其次是直斜型,单斜型最差;对斜型、单斜型最佳喷射角度分别为75o、60o,而直斜型最佳喷射角度为60o和75o;水力压裂压强越接近地应力,压裂影响面积减小越快,水力喷射布置方式影响越不显著.
Aiming at the effect of hydraulic jetting arrangement on the fracturing effect of shale gas exploitation, a two-dimensional model of shale gas horizontal well hydraulic jet prefabricated fractures was established. By means of numerical simulation and considering the influence of hydraulic fracturing pressure and buried depth of gas reservoir, The arrangement pattern and the jetting angle of the shale gas reservoir are given.The stress distribution of the jet arrangement type and jetting angle to the hydraulic fracturing are given and the optimal hydraulic jet arrangement is determined.The results show that the same hydraulic fracturing pressure and depth Among the three types of hydraulic jetting methods, inclined-type, straight-inclined type and monoclinic type, the inclined type fracturing effect is the best, followed by the straight type and the single type is the worst; The optimum jetting angles are 75o and 60o, respectively, while the optimum jetting angles are 60o and 75o. The closer the hydraulic fracturing pressure is to the ground stress, the faster the area affected by the fracturing is reduced, and the less obvious is the influence of the hydraulic jet arrangement.