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Effects of temperature and time on interfacial tension behavior between heavy oils and alkaline solutions

Heavy oils contain significantly more acidic components than conventional crude oils. Upon contact with aqueous alkaline solutions, water-soluble surfactants are formed in-situ at the interface. These surfactants have the ability to reduce the oil/water interfacial tension to ultra-low values. This work studies the significant effects of time and temperature on the interfacial tension between alkaline solutions and two Canadian heavy oils (Lloydminster and Cold Lake). The results obtained indicate that the time period during which interfacial tension remains ultra-low is just as important as the magnitude of the minimum attainable interfacial tension in determining the potential success of an alkaline flooding process in the field. 
 
 
 
Les huiles lourdes contiennent sensiblement plus de composants acides que les bruts conventionnels. Au contact de solutions alcalines aqueuses, il se forme in-situ a l'interface, des agents tensio-actifs solubles dans l'eau. Ces surfactants peuvent reduire la tension interfaciale huile/eau a des valeurs ultra faibles. On etudie, dans le present travail, les effets importants du temps et de la temperature sur la tension interfaciale entre des solutions alcalines et deux huiles lourdes canadiennes (celles de Lloydminster et Cold Lake). Les resultats obtenus indiquent que la periode de temps durant laquelle la tension interfaciale demeure ultra faible est aussi importante que la valeur de la tension interfaciale minimale acceptable, pour determiner le succes eventuel d'un procede d'extraction alcaline dans le gisement.