气藏工程气藏工程气藏工程 (3).pdf
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1、 1.1 Basic parameters of natural gases1 Composition of natural gasesMole fraction,yi:iiinnyVolume fraction,vi:iiiiyVVvMass fraction,wi:iiiWWwiiiiiMyMywiiiiiMwMwy/2 Apparent Molecular weightkiiigMyM1Example1:calculate the apparent molecular weight of the air.78%nitrogen 21%oxygen 1%argon molgmolgMyMy
2、MyMyMAANNOOkiiig/29/97.2894.3901.001.2878.00.3221.013 Specific gravity The ratio of the densities of the gas and dry air when both are measured at the standard conditions(20,0.101MPa).airggRTpMgairgairggMMRTpMRTpM29ggM4 Gas formation volume factor the volume of a gas at reservoir conditions required
3、 to produce per unit volume of gas at the surface.scRgVVBpznRTVR00pnRTVsc0000PTTzPpnRTPznRTVVBscRg5 Gas Compressibility the fractional change of volume as pressure is changed at constant temperature,or the change in volume per unit volume for a unit change in pressure.TgpVVc1 Natural gas-Compressibl
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