PROPERTIES OF RESERVOIR GASES - Petroleum Reservoir Fluid Property Correlations - page 31

J Equation (2.5), ºR/psia

K Equation (2.6), ºR/psia 1/2

M Molecular weight (molar mass), lb/lb mole

m(p) Real gas pseudopressure, psia 2 /cp

n Mass of gas, lb moles

p Pressure, psia

p c Critical pressure, psia

p pc Pseudocritical pressure, psia

p pr Pseudoreduced pressure, p/p pc , dimensionless

p sc Standard (base) pressure, psia

R Universal gas constant, 10.732 psia cu ft/lb mole ºR

T Temperature, ºR

T c Critical temperature, ºR

T pc Pseudocritical temperature, ºR

T pr Pseudoreduced temperature, T/T pc , dimensionless

T sc Standard (base) temperature, ºR

V Volume, cu ft

V actual Actual (real) volume at some p and T , cu ft

V ideal Volume calculated with ideal gas equation at some

p and T , cu ft

V R Volume at reservoir conditions, cu ft

V sc Volume at standard (base) conditions, cu ft

z Compressibility factor (z-factor), dimensionless

z sc Compressibility factor (z-factor) at standard

conditions, dimensionless, usually taken to have a
value of 1.0

Greek
α 0 , α 1 , α 2 , α 3 , α 4 , α 5 Constants in Piper et al. equation, equation (2.5)
β 0 , β 1 , β 2 , β 3 , β 4 , β 5 Constants in Piper et al. equation, equation (2.6)
γ g Gasspeciicgravity