Difference between revisions of "Water formation volume factor"

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Water formation volume factor

Handy equation to get the formation water (brine) salinity from the density at standard conditions obtained by the data regression with a stage line.

Water salinity from density equation [1]

Math and Physics

C_{mg/l} = 25000 \times (SG_w - 1) \times 62.428

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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