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THE ANALYTICAL STUDY OF ABNORMALLY HIGH PRESSURE GAS RESERVOIR DEPLETION CHARACTERISTICS

During the depletion process of gas reservoir with abnormally high pressure,there is usually an inflexion on the P/Z Vs.Gp curve.Correctly predicting the P/Z Vs.G p Curves feature is very important for gas reservoir developing management.This paper proposed an analytical method to study the abnormally high_pressure gas reservoir's depletion characteristics.Considering the gas and rock's properties variation with pressure in the mathematics model of a circle closed gas reservoir,the average pressure can be deduced by the analytical method and can be used to analyze the depletion characteristics of abnormally high_pressure gas reservoir.All the possible P/Z Vs.Gp curve's features have been discussed in this paper based on the deduced average pressure solution.The result shows that the depletion feature of the abnormally high_pressure gas reservoir is sensitive with the variation of rock's compressibility and gas's PVT and the related water.The P/Z Vs. Gp curve's feature maybe different for different properties,it can be one of a straight line or a protruding curve or a concave curve .This analytical average pressure solution can not only be used to study the depletion characteristics,but also be a theoretical reference for correctly programming the depletion strategies of an abnormally high_pressure gas reservoir.