Institute of Petroleum Engineering

Centre for Gas Hydrate Research Publications

Abstract 128
Modelling Gas Solubility in Saline Solutions and its Importance to IOR Gas Injection
Masoudi, R., and Tohidi, B.
13th Oil, Gas & Petrochemical International Congress, Tehran, Iran, 24-26 January (2005).
Gas injection (e.g., carbon dioxide, air, hydrocarbon gas) is a proven improved oil recovery (IOR) technique. The amount of gas lost to the coexisting aqueous phase, which is usually saline solution, can have a significant influence on the incremental oil recovery as it affects the properties of hydrocarbon phase and change the phase behaviour of complex brine/hydrocarbon systems. IOR gas injection simulators should therefore take into account the amount of gas solubility (in particular those of highly soluble gases such as CO2) in the aqueous phase. In this work, a compositional phase behaviour model has been developed for predicting solubility of various gases; including carbon dioxide, nitrogen, methane, and ethane in distilled water and different saline solutions over a wide range of temperature, pressure, and aqueous phase salinity. The solubility of gases in the saline aqueous phase is calculated by combining a cubic equation of state with non-density dependent mixing rules in which salts have been treated as entity pseudo components. The water-salt and gas-salt interaction parameters have been determined by using the available VLE and SLE experimental data. The predictions of the model have been compared with those of other leading published methods against experimental data.

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