Difference between revisions of "Water formation volume factor"

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  |ISBN=978-0878143351
 
  |ISBN=978-0878143351
 
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<ref name=M1991>{{cite journal
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|last1=McCain|first1=W.D. Jr.
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|title=Reservoir-Fluid Property Correlations-State of the Art
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|journal=Society of Petroleum Engineers
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|number=SPE-18571-PA
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|date=1991
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|url=https://www.onepetro.org/journal-paper/SPE-18571-PA
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|url-access=registration
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}}</ref>
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}}</ref>
 
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Revision as of 06:00, 1 October 2020

Water formation volume factor

The water formation volume factor represents the change in volume of the brine as it is transported from the reservoir conditions to surface conditions[1].

The units are reservoir barrels per surface barrel at standard conditions, res bbl/STB.

Water formation volume factor

Math and Physics

B_w = (1+\Delta V_{wP})(1+\Delta V_{wT})

where

\Delta V_{wP} = -1.95301(10^{-9}) P T - 1.72834(10^{-13}) P^2 T - 3.58922(10^{-7}) P - 2.25341(10^{-10}) P^2
\Delta V_{wT} = -1.0001(10^{-2}) + 1.33391(10^{-4}) T + 5.50654(10^{-7}) T^2

Application range

The correlation is valid through the full range of solids concentrations, temperatures to 260F, and pressures to 5000psia.

Example. Calculating water salinity from density

Example source [1]

Input data

\rho_w = 65.4 lbm/ft3

Calculate water salinity in weight percent solids?

Solution

SG_w = \rho_w/62.428=1.0476
C_{mg/l} = 25000 (1.0476 - 1) 62.428 = 74289.32
C_{ppm} = 74289.32 / 1.0476 = 70913.8
C_W = 70913.8 / 10000 = 7.1 %

Nomenclature

C_{ppm} = water salinity / solids concentration, ppm
C_{mg/l} = water salinity / solids concentration, mg/l
C_W = weight percent solids, %
SG_w = water specific gravity, dimensionless

See also

Water solids concentration

References

  1. ↑ 1.0 1.1 McCain, W.D. Jr. (1990). Properties of Petroleum Fluids (2 ed.). Oklahoma: PennWell Corp. ISBN 978-0878143351. 

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