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Pseudo-component delumping for multiphase equilibrium in hydrocarbon-water mixtures

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Dan Vladimir Nichita, Daniel Broseta, Patrick Elhorga, Francois Montel

Editorial: Taylor & Francis, Petroleum Science and Technology, 26 (17), p.2058 - 207, 2008.


An analytical and consistent delumping procedure is implemented for fluids of petroleum interest containing water, non-hydrocarbon gases (such as N2, CO2 and H2S) and hydrocarbon (HC) compounds. Two sorts of difficulties are associated with these fluids: they often exhibit three or more equilibrium phases, and their thermodynamics cannot be described by conventional cubic equation of state (EoS). In this work, the Soreide-Whitson modification of the Peng-Robinson EoS, in which different binary interaction parameters are used in the aqueous and non-aqueous phases, is used. The method is successfully tested on two cases in the two- and three-phase regions: one synthetic HC/N2/CO2/H2O fluid, and a “real” water/reservoir fluid.

Cuvinte cheie: phase equilibrium, equation of state, pseudo-component, lumping, delumping, hydrocarbon-water mixture