Discussion about well test evaluation method for gas wells in complicated low permeability gas reservoir

This paper is about the experimental research on cores from volcanic gas reservoirs,such as the complicated low permeability Xushen gas field.According to the research it can be got that the filtering flow characteristics of the cores are not coincident with Darcy law,and the fluids flow is influenced by the actuating pressure.The relationship between the actuating pressure gradient and the cores air permeability,mobility,immobile water saturation and cores depth is analyzed.Based on the experiments,the mathematic model for vertically fractured wells under low velocity non-Darcy filtering flow is built,the well test interpretation software is compiled,and the example for the application of this software to Xushen gas field is introduced.The method can provide certain guide to the dynamic analysis for complicated low permeability gas wells.