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

Example source

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