Difference between revisions of "Water compressibility"

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== Nomenclature  ==
 
== Nomenclature  ==
:<math> B_w </math> = water formation volume factor, res bbl/STB
+
:<math> C_{mg/l} </math> = pressure correction, res bbl/STB
 +
:<math> C_{mg/l} </math> = water salinity or solids concentration, mg/l
 
:<math> P </math> = pressure, psia
 
:<math> P </math> = pressure, psia
 
:<math> T </math> = Temperature, °F
 
:<math> T </math> = Temperature, °F
:<math> \Delta V_{wP} </math> = pressure correction, res bbl/STB
 
:<math> \Delta V_{wT} </math> = temperature correction, res bbl/STB
 
  
 
==See also==
 
==See also==

Revision as of 05:57, 2 October 2020

Water compressibility

The formation water (brine) isothermal compressibility data is published in 1990 by McCain[1].

Water compressibility data [1]

Math and Physics

At pressures above bubble point:

 c_w = 1 / (7.033 P + 0.5415 C_{mg/l} - 537 T + 403300) [2]

Application range

The correlation is valid only for temperatures between 200 and 270F, pressures of 1000 to 20000 psia, and salinities up to 200000 mg/l[2].

Discussion

We, at pengtools.com, are calculating water compressibility below the bubble point with the same equation at the moment.

Example. Calculating water isothermal compressibility

Example source [1]

Input data

 C_{mg/l} =  74289.3

Calculate water isothermal compressibility at 3500 psia and 165°F?

Solution

 c_w = 2.6348E-6\ psia^{-1}

Nomenclature

 C_{mg/l} = pressure correction, res bbl/STB
 C_{mg/l} = water salinity or solids concentration, mg/l
 P = pressure, psia
 T = Temperature, °F

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. 2.0 2.1 McCain, W.D. Jr. (1991). "Reservoir-Fluid Property Correlations-State of the Art"Free registration required. Society of Petroleum Engineers (SPE-18571-PA).