Geoscience Reference
In-Depth Information
Although the values of ARE in these figures do not indicate a
preference for any of the correlation equations, the AARE values clearly
indicate the Beggs-Robinson formulations for both dead oil viscosity
and viscosity at pressure to be better than the others.
Recommended correlation equations for estimation of reservoir
oil viscosities at reservoir pressures equal to and less than
bubblepoint pressure
Thus, the recommended equations for oil viscosities for use with
pressures equal to and less than the bubblepoint pressure are given in
equations (3.23a)-(3.23e).
47
(3.23a)
where
(3.23b)
and
(3.23c)
where
,
(3.23d)
,
(3.23e)
and where values of
R
s
can be obtained at the pressure of interest using
equations (3.8a)-(3.8f).
Evaluation of proposed correlation equations for reservoir oil
viscosities at reservoir pressures greater than bubblepoint pressure
Statistics of the data set used to evaluate reservoir oil viscosity
correlation equations at reservoir pressures greater than the bubblepoint
pressure of the reservoir oil are given in table 3-26.
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