Water density

Formation water density

Water density

The density of formation water (brine) at standard conditions (14.7psia & 60°F):

$\rho_{wSC} = C_{mg/l}/25000 + 62.428$

The density of formation water (brine) at reservoir conditions:

$\rho_{wR}=\rho_{wSC}/B_w$

Example. Calculating formation water density

Example source

Input data

$C_{mg/l} = 74289.3$

$B_w = 1.022$ at 3176 psia and 165°F

Estimate the density of the brine at standard conditions (14.7psia & 60°F) and at 3176 psia and 165°F?

Solution

$\rho_{wSC} = 74289.3/25000 + 62.428 = 65.4 lb_m/ft^3$

$\rho_{wR} = 65.4/1.022= 64 lb_m/ft^3$

Nomenclature

$B_w$ = water formation volume factor, res bbl/STB

$C_{mg/l}$ = water salinity or solids concentration, mg/l

$\rho_{wSC}$ = water density at standard conditions, lb_m/ft³

See also

Water bubble point pressure

Water compressibility

Water density

Water formation volume factor

Water salinity from density equation

Water solids concentration

Water viscosity