Geoscience Reference
In-Depth Information
3
PROPERTIES OF BLACK OILS
The reservoir fluid properties of interest in petroleum engineering
include the following:
1. Bubblepoint pressures
2. Solution gas-oil ratios at pressures less than
bubblepoint pressure
3. Coefficients of isothermal compressibility
4. Reservoir oil densities
5. Formation volume factors
6. Reservoir oil viscosities
Correlation equations that have been proposed for estimating values of
these reservoir fluid properties have been evaluated using large sets of
data from service company fluid property laboratory studies on black
oil samples with worldwide origins.
Field Data for Use in Black Oil Correlations
The basic premise is that in the application of the correlations,
the compositions of the oils are not known, i.e., a laboratory study is
not available. Thus, field data are required as input to the correlation
equations to estimate values of the fluid properties of interest. The
correlations rely on readily available data: (1) stock-tank oil gravity, ÂșAPI,
(2) first-stage separator gas specific gravity, and (3) solution gas-oil ratio
at bubblepoint pressure, standard cubic feet per stock-tank barrels (scf/
STB), all of which are routinely measured as a part of the sales process;
(4) reservoir temperature, and (5) selected values of reservoir pressure.
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