Difference between revisions of "Water compressibility"

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We at pengtools.com are calculating water compressibility below the bubble point with the same equation at the moment.
 
We at pengtools.com are calculating water compressibility below the bubble point with the same equation at the moment.
  
==Example. Calculating water formation volume factor==
+
==Example. Calculating water isothermal compressibility==
 
Example source <ref name= M1990/>
 
Example source <ref name= M1990/>
 
===Input data===
 
===Input data===
 +
:<math> C_W =  74289.3 mg/l</math>
  
Calculate water formation volume factor at 3176 psia and 165°F?
+
Calculate water isothermal compressibility at 3500 psia and 165°F?
  
 
===Solution===
 
===Solution===

Revision as of 05:50, 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_W =  74289.3 mg/l

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

Solution

 \Delta V_{wP} = -0.0047241
 \Delta V_{wT} = 0.027
 B_w = 1.022

Nomenclature

 B_w = water formation volume factor, res bbl/STB
 P = pressure, psia
 T = Temperature, °F
 \Delta V_{wP} = pressure correction, res bbl/STB
 \Delta V_{wT} = temperature correction, res bbl/STB

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).