(13)--201905GRE-chap1.1气藏工程气藏工程.ppt

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1、 1.1 Basic parameters of natural gases1 Composition of natural gasesMole fraction,yi:Volume fraction,vi:Mass fraction,wi:2 Apparent Molecular weightExample1:calculate the apparent molecular weight of the air.78%nitrogen 21%oxygen 1%argon 3 Specific gravity The ratio of the densities of the gas and d

2、ry air when both are measured at the standard conditions(20,0.101MPa).4 Gas formation volume factor the volume of a gas at reservoir conditions required to produce per unit volume of gas at the surface.5 Gas Compressibility the fractional change of volume as pressure is changed at constant temperatu

3、re,or the change in volume per unit volume for a unit change in pressure.Natural gas-Compressible fluid Depleted method!5 Gas Compressibility For an ideal gas The coefficient of isothermal compressibility of a gas is inversely proportional to pressure.5 Gas CompressibilityFor pure real gasAt high pr

4、essures At low pressures 5 Gas CompressibilityFor natural gasespseudoreduced compressibility6 Gas Viscositya measure for the internal resistance of fluids to flow6 Gas ViscosityThe Lee et al.correlation for estimating gas viscosityRange:100P(psia)8000 and 100T()340.6 Gas Viscosity(1)calculate the viscosity of a mixture of gases at 1 atm.6 Gas Viscosity(2)calculate the gas viscosity ratio6 Gas Viscosity6 Gas Viscosity(3)Calculate the gas viscosity at high pressure Thank you for your attention!