Solubility of natural gases in aqueous salt solutions--II : Nitrogen in aqueous NaCl, CaCl 2 , Na 2 SO 4 and MgSO 4 at room temperatures and at pressures below 1000 psia

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Scientific paper

The solubility of nitrogen in brine at room temperatures and at pressures below 1000 psia was determined in an effort to understand better the processes controlling intrastratal fluid flow. Solubilities were measured in water, aqueous NaCl, CaCl 2 , Na 2 SO 4 and MgSO 4 solutions by the pressure decline method. The results for water are in satisfactory agreement with those of other investigators. Previously published solubilities for salt solutions are limited to NaCl at low pressure, and are considerably smaller than those found in the present study. The data were used to estimate the invariant liquid compositions for the quaternary system N 2 -H 2 O-NaCl-CaCl 2 at 30°C and a representative pressure of 500 psia, from which the liquidus surfaces in the tetrahedral phase model may be constructed.

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