Influence of phase orientation on dynamic interfacial tension measured by drop volume tensiometry

Abstract

In processes involving two liquid phases, such as enhanced oil recovery, one phase is often present in a drop form (drop phase) while the other is in continuous form (bulk phase). In the present paper, the effect of such phase orientation on dynamic interfacial tension between the two phases formed by the partially miscible system composed of butanol-1 and water has been investigated by using the method of drop volume tensiometry. With butanol-rich (butanol-I saturated by water ) as the drop phase and water-rich (water saturated by butanol-1) as the bulk phase, the interfacial tension is 1.70 * 0.02 mN/m. The interfacial tension for water-rich as the drop phase is almost identical at 1.72 * 0.03 mN/m. Addition of a surfactant, sodium dodecyl sulfate, to the system has been studied. When the surfactant is added to the drop phase (either butanol-rich or water-rich), the magnitude of the decrease in interfacial tension is smaller than when surfactant is added to the bulk phase (water-rich or butanol-rich) or to both phases. Under otherwise identical conditions, when the water-rich acts as the drop phase, the apparent interfacial tension is higher than that when the butanolrich acts as the drop phase.Dans les procedes faisant intervenir deux phases liquides, telle la recuperation assistee au petrole, I'une des phases se presente souvent sous forme de gouttes (phase de gouttes) et I'autre sous forme continue (phase dense). Dans cet article, on a etudie I'effet d'une telle orientation de phases sur la tension interfaciale dynamique entre les deux phases formees par le systeme partiellement miscible compose de butanol-I et d'eau par la methode de tensiometrie du volume des gouttes. Avec le milieu riche en butanol (butanol-1 sature par I'eau) comme phase de gouttes et du milieu riche en eau (eau saturee par du butanol-I) comme phase dense, la tension interfaciale est de 1,70 f 0.02 mN/m. La tension interfaciale pour le milieu riche en eau c o m e phase de gouttes est presque identique a 1,72 * 0,03 mN/m. L'ajout au systeme d'un surfactant, soit le sulfate de dodkcyl de sodium, est etudik. Lorsque le surfactant est ajoute a la phase des gouttes (soit riche en butanol, soit riche en eau), I'ampleur de la reduction de la tension interfaciale est moindre que lorsqu'il est ajoutk a la phase dense (riche en eau ou riche en butanol) ou aux deux phases. Dans des conditions par ailleurs identiques, lorsque le milieu riche en eau agit comme phase de gouttes, la tension interfaciale apparente est plus grande que lorsque c'est le milieu riche en butanol qui agit c o m e phase de gouttes.Keywords: drop volume tensiometry, dynamic interfacial tension, butanol-1 /water system, sodium dodecyl sulfate.ince the fmt field application in 1865, improved oil S recovery has evolved from simple water injection to the complicated processes involving the addition of solvents, chemicals, gas or heat. These additives change either one or several of factors such as the mobility ratio, rock wettability and watedoil interfacial tension (IFT) (Chiang e...

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