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Free Gas in Reservoir at Reservoir Pressures
Less Than Bubblepoint Pressure
McCain and Hill reported a reasonably accurate correlation equation
to predict the specific gravities of gases evolved in the reservoir from
black oils at pressures below the bubblepoint pressures of the reservoir
oils.
51
These values of free gas specific gravities can be used with the gas
correlations discussed in chapter 2 to estimate values of the properties
of reservoir free gas associated with black oils. No other correlations for
the specific gravities of reservoir free gas have been published.
The equation is given in equation (3.25).
(3.25)
a
1
-208.0797
a
2
22,885
a
3
-0.000063641
a
4
3.38346
-0.000992
a
5
a
6
-0.000081147
a
7
-0.001956
a
8
1.081956
a
9
0.394035
Evaluation of recommended correlation equation for specific gravity
of free gas in the reservoir
This equation was evaluated with the data set described in table 3-28.
Notice that the minimum pressure is approximately 300 psig; this was
the minimum reservoir pressure specified for equation (3.25) by McCain
and Hill.
52
Apparently use of this equation for pressures less than 300
psig can result in large errors in predicted free gas specific gravities.
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