Page 40 - Handbook of Natural Gas Transmission and Processing Principles and Practices

FIGURE 1.3 Compressibility of natural gases as a function of reduced pressure and temperature
(Standing and Katz, 1942).

1.6.1.3. Gas Formation Volume Factor

The formation volume factor for gas is defined as the ratio of volume of 1 mol of gas at reservoir

conditions to the volume of 1 mol of gas at standard conditions (P and T ). Using the real gas law
s
s
and assuming that the Z factor at standard conditions is one, the equation for formation volume
factor (B ) can be written as:
g

(1.11)

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