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Interfacial Tension Measurements of Oil/Gas/Water Systems Using State-of-the-Art Vapour-Liquid Equilibrium Interfacial Tension (VLE-IT) Equipment
A new apparatus and method for measuring vapour-liquid equilibrium and interfacial tension at reservoir conditions is reported. Pendant drop and drop volume measurements of interfacial tension, and vapour-liquid equilibrium were carried out with carbon dioxide and several Malaysian crude oils. The character of the heptane plus (C7+), the phase behaviour of the solvent-oil mixtures, and the measured interfacial tensions were interpreted and used to calibrate an equation of state model. The calibrated equation of state was then employed to extrapolate the fluid state properties to zero tension. This technique is thought to simulate the approach to miscibility.
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