PROPERTIES OF RESERVOIR GASES - Petroleum Reservoir Fluid Property Correlations - page 26

Recommended correlation equations for estimation of gas viscosities
Thus, the LGE correlations are recommended to estimate gas
viscosity. 36

( ) EXP B g C ( )

µ g = A 10 4 (2.14)

where

(2.15)

,

, and

(2.16)

.

(2.17)

The gas density in equation (2.14) is in grams per cubic centimeter
(g/cc), which is 62.428 multiplied by the results of equation (2.9), and
the resulting gas viscosity is in centipoise.

Coefficients of Isothermal Compressibility
of Reservoir Gases

The coefficient of isothermal compressibility of a gas is often called
gas compressibility . It is the fractional change in volume of the gas as
pressure changes at constant temperature. The definition is given in
equation (2.18).

(2.18)

An equation for calculation of gas compressibility can be obtained
by combining equation (2.18) with the real gas equation, equation (2.2),
resulting in equation (2.19).