Difference between revisions of "Water salinity from density equation"

Revision as of 13:44, 30 September 2020

Handy equation to get the formation water (brine) salinity from the density at standard conditions.

Water salinity from density equation ^[1]

C_{mg/l} = 25000 \times (SG_w - 1) \times 62.428

Example source ^[1]

\rho_w

= 65.4 lbm/ft3

Calculate water salinity in weight percent solids?

SG_w = \rho_w/62.428=1.0476

C_{mg/l} = 25000 (1.0476 - 1) 62.428 = 74289.32

C_{ppm} = 74289.32 / 1.0476 = 70913.8

C_W = 70913.8 / 10000 = 7 %

C_{mg/l}

= water salinity / solids concentration, mg/l

SG_w

= water specific gravity, dimensionless

↑ ^1.0 ^1.1 McCain, W.D. Jr. (1990). Properties of Petroleum Fluids (2 ed.). Oklahoma: PennWell Corp. ISBN 978-0878143351.

@@ Line 18: / Line 18: @@
 ===Solution===
 :<math> SG_w = \rho_w/62.428=1.0476</math>
-:<math> C_{mg/l} = 1e7 (1.0476 - 1) / 7.8216=60857.1</math>
+:<math> C_{mg/l} = 25000 (1.0476 - 1) 62.428 = 74289.32 </math>
+:<math> C_{ppm} = 74289.32 / 1.0476 = 70913.8</math>
+:<math> C_W = 70913.8 / 10000 = 7 %</math>
 == Nomenclature  ==