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Recommended correlation equations for estimation of coefficients
of isothermal compressibility of oil at reservoir pressures greater
than bubblepoint pressure
The recommended equations for the three versions of oil
compressibility are given below. 25
Coefficients of isothermal compressibility for use from bu b blepoint
pressure to some higher reservoir pressure, c ofb , can be estimated with
equation (3.13a).
(3.13a)
where
(3.13b)
and
(3.13c)
n
VAR n
C0 n
C1 n
C2 n
1
ln API
3.011
-2.6254
0.497
2
ln γ gSP
-0.0835
-0.259
0.382
3
ln p b
3.51
-0.0289
-0.0584
4
ln p/p b
0.327
-0.608
0.0911
5
ln R sb
-1.918
-0.642
0.154
6
ln T R
2.52
-2.73
0.429
Coefficients of isothermal compressibility for use from initial
reservoir pressure to some lower reservoir pressure, both pressures above
the bubblepoint pressure, c oi , can be estimated with equation (3.14).
(3.14)
where c ofb ( p ) is oil compressibility from the bubblepoint pressure, p b ,
to the pressure of interest, p , and c ofb ( p i ) is oil compressibility
from the bubblepoint pressure, p b , to the initial pressure, p i .
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