Geoscience Reference
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Recommended correlation equations for estimation of solution
gas-oil ratios at reservoir pressures less than bubblepoint pressure
The recommended correlation equations for solution gas-oil ratios,
R
s
, at reservoir pressures less than bubblepoint pressure using field data
are given below.
20
(3.8a)
where
,
(3.8b)
,
(3.8c)
,
(3.8d)
,
(3.8e)
and
.
(3.8f)
A
0
= 9.73 x 10
-7
B
0
= 0.022339
C
0
= 0.725167
A
1
= 1.672608
B
1
= -1.004750
C
1
= -1.485480
A
2
= 0.929870
B
2
= 0.337711
C
2
= -0.164741
A
3
= 0.247235
B
3
= 0.132795
C
3
= -0.091330
A
4
= 1.056052
B
4
= 0.302065
C
4
= 0.047094
Coefficients of Isothermal Compressibility
of Reservoir Oils
The
coefficient of isothermal compressibility of oil
is usually called
oil
compressibility
.
At pressures above bubblepoint pressure, oil compressibility
simply represents the expansion of the reservoir oil as reservoir
pressure decreases. At pressures below bubblepoint pressure, the oil
compressibility includes the change in volume of the oil (which is often
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