Geoscience Reference
In-Depth Information
Table 4-8. Coefficients for brine compressibility for use with equation (4.1)
a
i
E
m
(
T
)
F
m,3/2
(
T
)
F
m,1
(
T
)
F
m,1/2
(
T
)
a
1
0
-0.617
0
0.0365
a
2
0
-0.747
9.917
-0.0369
a
3
0.1249
-0.4339
5.1128
0
a
4
0
0
0
0
a
5
0
10.26
3.892
0
Next, calculate the brine compressibility coefficients
E
b
(
T
,
m
) and
F
b
(
T
,
m
) from equations (4.7) and (4.8).
(4.7)
(4.8)
Step 6.
Calculate the compressibility of methane-free brine in MPa
-1
, at
temperature
T
, pressure
p
, and salinity
m
, from equation (4.9).
(4.9)
Step 7.
Calculate the density of methane-free brine as follows.
First, calculate the values of
I
b
(
T
,70 MPa,
m
) and
I
b
(
T
,
p
,
m
) from
equations (4.10) and (4.11).
(4.10)
(4.11)
Next, calculate the methane-free brine density
ρ
b
(
T
,
p
,
m
), in g/cm
3
,
from equation (4.12).
(4.12)
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