Page 318 - Principles of Applied Reservoir Simulation 2E

Part V: Technical Supplements 303

KODEA GAS DESCRIPTION
2 Sour gas: input 12 component mole fractions in the order
y\ y-i y3 y* 0- o. o. o. o. o. o. o.
where j/j = mole fraction of H 2S,
y 2 = mole fraction of CO 2
y 3 = mole fraction of N 2, and

3 Sweet or sour gas with the following 12 component mole frac-
tions read in the following order:
H 2S, CO 2, N 2, Cj, C 2, C 3, iC 4, nC 4, iC 5, nC 5, C 6, C 7+.
The sum of the mole fractions should equal one.

4 Same as KODEA = 3 but also read critical pressure, critical
temperature, and molecular weight of C 7+.

Correlation Range Limits
The following range limits apply to correlations used in calculating gas
Z-factors, compressibilities and viscosities:
1.05 < — < 3.0
T c

0.01 < — < 15.0
PC

0.55 < SPG < 1.5
40 < T < 400
where
= pseudo-critical temperature (°R)
T c
= pseudo-critical pressure (psia)
P c
T = temperature (°R)
P = pressure (psia)
SPG = gas specific gravity
No values of r, P, or SPG should be used that exceed the above correlation
ranges. If the range limit is exceeded, a fatal error will occur.