000			01931nab a2200193 4500
005			20260520002026.0
008			260224s2011 xxu
245	0	0	_aComparative evaluations of a new gas/oil miscibility-determination technique
260			_a _b _csep./oct. 2011
270			_a20/10/2011 ; 20/10/2011
300			_a11 p. ; 71-81
520			_aTranscripción del resumen del autor. A new experimental technique of vanishing interfacial tension (VIT) has been reported in recent literature for quick and cost-effective determination of gas/oil miscibility. However, this technique has been criticized because of the perceived absence of compositional-path specification and lack of confirmation against standard gas/oil systems. In this paper, we address these concerns by conducting interfacial-tension (IFT) measurements at elevated pressures and temperatures in two standard gas/oil systems and at varying molar compositions of gas and oil in feed mixtures. Though gas/oil ratio was found to have an impact on mass-transfer rates, the IFT between gas and oil was unaffected in the two standard gas/oil systems as the fluid phases approached equilibrium. This indicates compositional-path independence of gas/oil IFTs measured at near-equilibrium conditions; hence, miscibilities determined using the VIT technique. The minimum miscibility pressures (MMPs) determined using the VIT technique acceptably matched (within 5 to 8%) with the reported slim tube miscibilities for both the standard gas/oil systems. These experimental results clearly support wide use of the VIT technique for rapid and cost-effective determination of MMPs and minimum miscibility enrichments (MMEs) in improved-oil-recovery applications.
581			_a9/10
773	0		_tJournal of Canadian Petroleum Technology _g50
942			_cARTICULO
100	1		_aAyirala, S.C. _951968
100	1		_aRao, D.N. _916756
999			_c186210 _d186210