气藏工程气藏工程气藏工程 (4).pdf
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1、 1.2 Equation of state for natural gases1 Ideal gas The volume of the gas molecules is insignificant compared with the total volume enclosing the gas;No attractive or repulsive forces exist among the molecules or between the molecules and the container walls;All molecule collisions are perfectly ela
2、stic;i.e.,there is no loss of internal energy upon collision.2 Equation of state for ideal gasnRTPVR:universal gas constantRTpMg3 Compressibility equation of state for natural gasznRTpVz:z-factor/gas deviation factor/gas compressibility factor idealactualVVz Vactual:volume occupied by a gas at given
3、 pressure and temperature Videal:volume the gas that would occupy at the same pressure and temperature if it behaved like an ideal gas4 Principle of corresponding state Pure,but similar,gases have the same Z factor at the same values of reduced pressure and reduced temperature.For pure substance:Red
4、uced temperature:crTTTReduced pressure:crppp4 Principle of corresponding stateFor mixture:the pseudoreduced pressurethe pseudoreduced temperaturepseudoreduced temperature:pseudoreduced pressure:pcprTTTpcprpppjcjjpcTyTjcjjpcpyppseudocritical pressure:4 Principle of corresponding stateStanding-Katz co
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