Geoscience Reference
In-Depth Information
4
PROPERTIES OF OILFIELD BRINES
The brine properties of interest in petroleum reservoir engineering
include the following:
1. Brine density
2. Brine formation volume factor
3. Coefficient of isothermal compressibility of brine
4. Solution gas-water ratio
5. Brine viscosity
Brine Correlations
The five field properties of interest listed above can be calculated
from three independent correlations based on lab measurements: (1)
density of methane-free brine, (2) solubility of methane in brine, and
(3) brine viscosity. Because the density, formation volume factor, and
compressibility are interrelated, the authors prefer to use a single
correlation to calculate all three quantities, thereby eliminating
potential inconsistencies.
The next three sections compare correlations for brine density, brine
compressibility, and methane solubility with available laboratory data
reported in the literature. The following section gives a step-by-step
procedure for calculating the reservoir brine properties of interest:
brine density, brine formation volume factor, brine compressibility, and
solution gas-water ratio. The final three sections compare correlations
for brine viscosity with selected laboratory data from the literature,
discuss extrapolation of data beyond the range of data on which the
correlations are based, and give a step-by-step procedure for estimating
viscosities for oilfield brines.
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