Geoscience Reference
In-Depth Information
Recommended correlation equations for estimation
of gas viscosities at HPHT
The recommended equations for HPHT use are given in equations
(2.25)-(2.28).
(2.25)
where
,
(2.26)
, and
(2.27)
.
(2.28)
Gas density in equation (2.25) should be in units of grams per cubic
centimeter, and the resulting gas viscosities are in centipoise.
Nomenclature
Latin
A
1
through
A
11
Constants in DAK equation, equation (2.7)
A
,
B
, and
C
Constants in the LGE and modified LGE
equations, equations (2.14) and (2.25)
B
g
Gas formation volume factor, res vol/std vol
c
g
Coefficient of isothermal compressibility
(gas compressibility), 1/psi
c
pr
Pseudoreduced coefficient of isothermal
compressibility, c
g
p
pc
, dimensionless
g
Acceleration due to gravity, ft/sec
2
g
c
Gravitational constant, 32.2 lb
m
ft/lbf,
f
, sec
2
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