Difference between revisions of "Water density"

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[[File:Water density.png|thumb|right|600px|Water density]]
 
[[File:Water density.png|thumb|right|600px|Water density]]
  
The density of formation water (brine) at standard conditions (14.7psia & 60°F)<ref name= M1990/>
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The density of formation water (brine) at standard conditions (14.7psia & 60°F):
  
:<math> \rho_{wSC} = C_{mg/l}/25000 + 62.428</math>
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:<math> \rho_{wSC} = C_{mg/l}/25000 + 62.428</math><ref name= M1990/>
  
The density of formation water (brine) at reservoir conditions <ref name= M1990/>
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The density of formation water (brine) at reservoir conditions:
  
:<math> \rho_{wR}=\rho_{wSC}/B_w </math>
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:<math> \rho_{wR}=\rho_{wSC}/B_w </math><ref name= M1990/>
  
 
==Example. Calculating formation water density ==
 
==Example. Calculating formation water density ==

Revision as of 12:15, 1 October 2020

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[1]

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

 \rho_{wR}=\rho_{wSC}/B_w [1]

Example. Calculating formation water density

Example source [1]

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, lbm/ft3

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.