This paper reports an investigation into the characterisation of liquidaivapor electrolyte solutions at high pressure and high temperature. A procedure to enable calcuIations of methane, carbon dioxide and hydrogen su...This paper reports an investigation into the characterisation of liquidaivapor electrolyte solutions at high pressure and high temperature. A procedure to enable calcuIations of methane, carbon dioxide and hydrogen sulphide solubilities in brines (0-6 m.) for temperature from 25 to 350℃ and for pressures from 1 to 1800 bar is presented. The model is based on Helgeson, Kirkham and Flowers modified equations of state (HKF) and on the semi-empirical interaction model introduced by Pitzer. HKF modified equations of state are used to calculate the reference fugacity of gas species, and the Pitzer ionic interaction model is used to calculate the activity coefficient of dissolved species (i.e. ionic or neutral).The efficiency of the combination of the two models is confirmed by several comparisons with data in the literature.展开更多
文摘This paper reports an investigation into the characterisation of liquidaivapor electrolyte solutions at high pressure and high temperature. A procedure to enable calcuIations of methane, carbon dioxide and hydrogen sulphide solubilities in brines (0-6 m.) for temperature from 25 to 350℃ and for pressures from 1 to 1800 bar is presented. The model is based on Helgeson, Kirkham and Flowers modified equations of state (HKF) and on the semi-empirical interaction model introduced by Pitzer. HKF modified equations of state are used to calculate the reference fugacity of gas species, and the Pitzer ionic interaction model is used to calculate the activity coefficient of dissolved species (i.e. ionic or neutral).The efficiency of the combination of the two models is confirmed by several comparisons with data in the literature.
