Models for mutual solubility of water and gas-oil components and hydrate formation are typically tuned to mixtures containing a free water phase. However, CO2-rich streams in CCS projects are commonly undersaturated with water. If the CO2 stream is injected into a reservoir and meets an aquifer, the CO2 will dissolve and form a mutually saturated system. Therefore, models used for designing CCS applications should consider saturated and undersaturated scenarios using a single set of parameters to ensure a seamless examination of all aspects. This work presents equations of state that were tuned to CO2-water data reflecting CCS process requirements.

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