Difference between revisions of "Water formation volume factor"

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==Math and Physics==
 
==Math and Physics==
  
:<math> B_w = (1+\Delta V_{wP})(1+\Delta V_{wT})</math>
+
:<math> B_w = (1+\Delta V_{wP})(1+\Delta V_{wT})</math><ref name= M1990/>
  
 
where
 
where
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== Application range ==
 
== Application range ==
The correlation is valid through the full range of solids concentrations, temperatures to 260F, and pressures to 5000psia.
+
The correlation is valid through the full range of solids concentrations, temperatures to 260F, and pressures to 5000psia<ref name= M1991/>.
  
 
==Example. Calculating water salinity from density==
 
==Example. Calculating water salinity from density==

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})[1]

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[2].

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 1.2 McCain, W.D. Jr. (1990). Properties of Petroleum Fluids (2 ed.). Oklahoma: PennWell Corp. ISBN 978-0878143351. 
  2. McCain, W.D. Jr. (1991). "Reservoir-Fluid Property Correlations-State of the Art"Free registration required. Society of Petroleum Engineers (SPE-18571-PA).