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Fluid Phase Behavior for Conventional and Unconventional Oil and Gas Reservoirs by Alireza Bahadori

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7.6.4. Formation Volume Factor

Gas-volume factor, Bg, is defined as the ratio of gas volume at reservoir conditions (Preservoir and Treservoir) to the ideal-gas volume at standard conditions,

Bg=(PscTsc)ZTP

image (7.181)

Substituting values of standard pressure and temperature (Psc = 14.7 psia and Tsc = 520°R) results:

Bg=0.02827ZTP

image (7.182)

in which T stands for the reservoir temperature (°R) and P denotes the reservoir pressure (psi). This definition of Bg presumes that the gas volume at P and T remains as a gas in standard circumstances. For gas condensates ...

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