Water compressibility

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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).