Water compressibility

Water compressibility

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

Water compressibility data

Math and Physics

At pressures above bubble point:

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

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.

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

Water compressibility correlation in the PVT software at pengtools.com

Example source

Input data

$C_{mg/l} = 74289.3$

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

Solution

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

The solution is also available in the PVT software model at [The solution is available in the PVT calculator software model at www.pengtools.com

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 bubble point pressure

Water compressibility

Water density

Water formation volume factor

Water salinity from density equation

Water solids concentration

Water viscosity