Fluid Phase Behavior for Conventional and Unconventional Oil and Gas Reservoirs

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7.6.4. Formation Volume Factor

Gas-volume factor, B_g, is defined as the ratio of gas volume at reservoir conditions (P_reservoir and T_reservoir) to the ideal-gas volume at standard conditions,

$B_{g} = (\frac{P_{sc}}{T_{sc}}) \frac{Z T}{P}$

(7.181)

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

$B_{g} = 0.02827 \frac{Z T}{P}$

(7.182)

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

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