关键词: 压裂, 裂缝条数, 不稳定渗流, 压力动态, 典型曲线

Abstract: Multiple radial fractures are generated in near bore zone by high energy gas fracturing and pulse fracturing，so the model of vertical fractured well with multiple fractures in homogeneous reservoir and double porosity reservoir is set up in this paper.Based on the pressure distribution formula of single fracture，by using superposition principle，the calculation method of unsteady percolation pressure response for vertical fractured well with multiple fractures is obtained.The typical curves are plotted and analyzed by considering the effect of reservoir parameter，fracture numbers and fracture distribution.The results show the flow characteristic of fluid in multiple fracture system is related to fracture numbers and fracture distribution.When the fracture number is less and angle is larger，the curve of pressure behavior can be divided into three flowing stages，i.e.，linear flow，elliptic flow and pseudo-radial flow.When the fracture number is more and angle is less，transitional section between linear flow and elliptic flow becomes longer，and the linear flow may be missing.At the same time，the more fracture number is，the more the fluid supply capacity，and the less bottom hold pressure will decrease.

Key words: fracturing, fracture number, unsteady percolation, pressure behavior, typical curve