页岩储层多簇限流射孔裂缝扩展规律

在多簇密集切割压裂情况下,多缝间诱导应力干扰现象严重,使得优化射孔簇参数促进多簇均衡改造变得尤为重要.采用耦合岩石变形和流体流动的多簇限流射孔裂缝扩展模型,结合裂缝形态定量评价指标,展开限流射孔参数对裂缝扩展影响规律研究.结果表明:段内六簇射孔压裂时,密集切割使得多簇间诱导应力场影响区更为复杂,高孔密、均匀布孔时多裂缝...

Study on the law of fracture propagation from multiple cluster limited entry perforation in shale reservoir

The induced stress interference is serious under the condition of dense cutting fracturing,which makes it more necessary to optimize perforation cluster parameters to promote balanced propagation from multi?ple perforation clusters.The fracture propagation model is proposed by coupling rock deformation and fluid flow,and fracture morphology quantitative evaluation index is established to study the fracture propagation law under limit entry perforating parameters.The results show that the influence area of induced stress field becomes more complex due to the dense cutting fracturing.For the case of high density and uniform distribution of perfo?ration holes,the heterogeneous propagation of multiple fractures is significant due to the induced shadow effect on the internal cracks.In the case of a fracturing interval with six perforating clusters,the strategy of small diam?eter and low perforating density can effectively promote the uniform propagation from multiple clusters.In the case of non-uniform limited perforating,keeping the total number of perforations unchanged,increasing the number of perforations in the middle two clusters,and reducing the perforation number at both ends of the same fracturing stage,the limited entry perforation strategy can effectively optimize the fracture morphology and im?prove the efficiency of multi cluster fracturing.