Society of Petroleum Engineers Journal · 1981 · 150 citations · 26 references
EngineeringChemical EngineeringPetroleum EngineeringMultiphase FlowReservoir EngineeringReservoir SimulationMultiphase Flow In ReservoirsPhase DiagramsPhase EquilibriaPhase RelationsPhase SeparationThermodynamics Of Phase EquilibriaCarbon Dioxide MiscibilityDisplacementEquilibrium Phase DiagramsFinite Difference AnalysisFinite Difference SimulationMulticomponent Phase DiagramsPhase Behavior ModelingPhase Separation Mechanisms
Abstract Phase behavior of CO2/crude-oil mixtures which exhibit liquid/liquid (L/L) and liquid/liquid/vapor (L/L/V) equilibria is examined. Results of single-contact phase behavior experiments for CO2/separator-oil mixtures are reported. Experimental results are interpreted using pseudoternary phase diagrams based on a review of phase behavior data for binary and ternary mixtures of CO2 with alkanes. Implications for the displacement process of L/L/V phase behavior are examined using a one-dimensional finite difference simulator. Results of the analysis suggest that L/L and L/L/V equilibria will occur for CO2/crude-oil mixtures at temperatures below about 120° F (49 °C) and that development of miscibility occurs by extraction of hydrocarbons from the oil into a CO2-rich liquid phase in such systems.
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