Expansion and elasticity of brines

[Sorade]

Hello,

I am currently looking at a way to calculate brine density using temperature, pressure and salinity.
I found the following page which describes the change in fluid density with pressure and temperature :
http://www.engineeringtoolbox.com/fluid-density-temperature-pressure-d_309.html

However I am missing two parameters which I haven't been able to find for brines:
- β = volumetric temperature expansion coefficient (m3/m3 oC)
- E = bulk modulus fluid elasticity (N/m2)

Ideally I would need to find an equation which takes in pressure, temperature and salinity which are my known variables. Or tables, the salinity of my brine is 7 wt%, the pressure around 400 bars and the temperature of 141 °C . Note: Since the temperature used to work out β is the average between 0 °C and 141 °C, I would be looking for β at 70.5 °C.

Thank you for your help

 

[NascentOxygen]

You may be able to compare your calculation with that determined by the formula in this article:
http://www.ogj.com/articles/print/volume-99/issue-52/drilling-production/method-determines-brine-density-for-hpht-wells

The authors present a pressure-density-temperature dependent equation-of-state for sodium chloride brine. Workers can calculate the equation's empirical coefficients, as functions of the brine weight concentration (W).

The image depicting the equation and parameters seems to be deliberately illegible low res in the online version of the publication.