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The Z-factor gives accurate gas volumetric properties: B g ,  g , c g .

The Z-factor gives accurate gas volumetric properties: B g ,  g , c g . Z-factor is particulary important for estimating initial gas in place (IGIP) and gas depletion recovery factors, IGIP = HCPV/B g .

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The Z-factor gives accurate gas volumetric properties: B g ,  g , c g .

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  1. The Z-factor gives accurate gas volumetric properties: Bg , g , cg. • Z-factor is particulary important for estimating initial gas in place (IGIP) and gas depletion recovery factors, IGIP = HCPV/Bg. • Z-factor is a function of pressure p, temperature T, and gas composition yi, usually expressed as Z(ppr ,Tpr), according to corresponding states theory,where ppr=p/ppc & Tpr=T/Tpc are pseudoreduced quanties. • Pseudocritical properties ppc and Tpc are functions of gas composition yi (or gas specific gravity g). Special treatment for H2S or CO2. • The accuracy of Z-factors from the Standing-Katz chart should usually be 1-3%. • The Hall-Yarborough BWR equation of state gives an accurate description of the Standing-Katz Z-factor chart for 1<Tr<3 and ppr<25. • Gas viscosities are usually accurate with 5-10%, with increasing expected errors at high pressures and for heavy gases. Typically g=0.02-0.03 cp.

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