水力喷射布置方式对页岩水力压裂效果影响

发布时间：2018-07-15 13:56

【摘要】：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.
[Abstract]:In view of the effect of hydraulic jet arrangement on the fracturing effect of shale gas production, a 2-D model of hydraulic jet prefabricated fractures in shale gas horizontal wells is established. The effect of hydraulic fracturing pressure and gas reservoir burial depth is considered by using numerical simulation method. The distribution characteristics of stress in shale gas reservoir by injection angle are analyzed. The type of injection arrangement and the effect area of injection angle on hydraulic fracturing are given. The best arrangement mode of hydraulic jet is determined. The results show that under the same hydraulic fracturing pressure and production depth, among the three types of hydraulic injection layout, the best is the oblique type, the second is the straight type, the worst is the single inclined type, the other is the inclined type, the second is the straight type, the second is the single inclined type, and the other is the inclined type. The optimum injection angle of monoclinic type is 75oC 60oo, while that of straight-inclined type is 60o and 75o.The pressure of hydraulic fracturing is close to in-situ stress, the area affected by fracturing decreases faster, and the effect of hydraulic injection arrangement is less obvious.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金项目(51374119) 辽宁省百千万人才工程项目(2013921056) 辽宁省自然科学基金优秀人才培育项目(2014020156) 辽宁省高等学校优秀人才支持计划(LR2015028)
【分类号】：TE377

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