Mostafa Mohamed Elmetwalli Elhawwari
Equation of state for hydrocarbons and water.
Rel. Dario Viberti, Eloisa Salina Borello. Politecnico di Torino, Master of science program in Petroleum And Mining Engineering, 2020
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Abstract
Equation of state for hydrocarbons and water Reservoir fluids consist mainly in multi-component system of hydrocarbons, non-hydrocarbons and formation water. Therefore, the reservoir fluids chemical composition is in many cases complex. Analytical equation of state (EOS) is used to calculate the volumetric and phase behavior of the reservoir fluids. EOS starts from simple ideal gas equation by Émile Clapeyron in 1834, but it had a lot of limitations regarding it’s applicability at real reservoir conditions. As van der Waals (1873) introduced his equation of state, it used to generalize the ideal gas law based on the fact that gases behave as real gases, even it doesn’t have any practical applications nowadays it was considered the basis for revolution in developing and enhancing EOS.
In Redlich and Kwong (RK, 1949) equation they included the temperature of the system to the van der Waals attraction term to consider its effects on the intermolecular attractive forces among the atoms which has improved the equation accuracy but it was not the last possible improvements to the VdW equation of state, the Soave-RK (1972) EOS was born as modification on RK EOS with a very good potential as it had overcome the fact that the RK equation was not accurate to express the effect of temperature which in turn improved the application of the equation of state to multicomponent vapor-liquid equilibrium (VLE) calculations
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