Phase equilibrium of North Sea oils with polar chemicals: Experiments and CPA modeling

Michael Grynnerup Frost, Georgios M. Kontogeorgis, Nicolas von Solms, Toril Haugum, Even Solbraa

Research output: Contribution to journalJournal articleResearchpeer-review


This work consists of a combined experimental and modeling study for oil - MEG - water systems, of relevance to petroleum applications. We present new experimental liquid-liquid equilibrium data for the mutual solubility of two North Sea oils + MEG and North Sea oils + MEG + water systems in the temperature range 303.15-323.15 K and at atmospheric pressure. These new data are for North Sea oils which are substantially heavier and with higher aromatic/naphthenic content compared to previous studies. The new data compare favorably with previously reported measurements for other North Sea oils. The data have been successfully modeled using the Cubic- Plus-Association (CPA) equation of state (EoS) using a previously developed characterization method and new correlations for estimating binary interaction parameters between MEG-hydrocarbons and water-hydrocarbons. The results are in satisfactory agreement to the experimental data, considering especially the complexity of the studied reservoir fluids, in particular their heavy and aromatic character.
Original languageEnglish
JournalFluid Phase Equilibria
Pages (from-to)122–136
Publication statusPublished - 2016


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