The Influence Of Pressure-sensitivity On Gas Well Filtering Flow In Low Permeability Reservoirs

Sulige gas field is a low pressure, low permeability and low abundance of reservoir. Because of its unique adverse reservoir conditions, make its development into big, difficult exploitation, productivity is low, the efficiency is poor. The formation pressure drops cause permeability reduced in gas field development process.This paper is based on Sulige gas field faced in low permeability gas reservoir development of practical problems, integrated application of gas reservoir static and dynamic material, research the control factors influence of gas well productivity by the exploitation conditions; through the analysis of the characteristics of pressure sensitive, obtain the gas pressure sensitive parameters, and conduct percolation mechanics theory research; through combining theory with practice, application of numerical simulation technology of different mining condition forecasting effect of the gas field development, get the following conclusions:1. There are two types in Sulige gas field commercial gas well, one without obvious pressure-sensitivity, another have serious pressure-sensitivity. Those gas well with serious pressure-sensitivity need reasonable production proration;2. When exist gas reservoir deformation, gas well stable time shortens greatly. Not only its recovery degree greatly decreased when the period of stabilized production finish, and eventually recovery degree also greatly decreased;3. For low permeability sandstone reservoir, formation pressure-sensitivity produced for the direct influence is single-well control radius narrowed, the producing energy premature deplete in single well control area. Therefore, the way to improve oil recovery ratio in Sulige gas field production tail can only further narrowing the development well spacing.