The High-Pressure Physical Property of Gas With CO2 in the Changshen Gas Reservoir

Abstract

The natural gas in Changshen gas reservoir has high CO2 content. There are no conventional methods to calculate the physical parameters of natural gas. In view of this specificity, the physical parameters are determined and analyzed by PVT laboratory experiments. Experimental studies show that, below 20 MPa, the compressibility factor, volume factor, density, and isothermal compressibility have strong sensitivity to pressure, but the steam content contributes little and the absolute viscosity maintains strong pressure sensitivity. The compressibility factor, density, absolute viscosity, and steam content increase violently stronger than volume factor with the increase of CO2, and the isothermal compressibility is not sensitive to CO2. The variations of the high-pressure physical properties of Changshen gas reservoir depend on pressure and CO2 content, which should be considered in the reservoir development.