The Interfacial Properties Of ASP System And Its Role In The Oil-displacement Effcet

ASP flooding involves chemical substances which are surfactant, alkali, polymer and soon and a lot of interfacial phenomenon.Formation of interfacial film and oil-displacementefficiency have bearing on interfacial behavior which these chemical reagents occur on theoil-water interface.As the mechanism study of enhanced oil recovery gradually going on, it isnecessary to study the interfacial properties of ASP system and its role in the oil-displacementeffect.Different ASP flooding system are chosen as the research objects. Through themeasurement of interfacial tension of different ASP flooding system, the differentconcentration of alkali, alkali type, different surfactant concentration and surfactant type ofASP flooding system and oil interfacial tension and their influence are studied. The method ofdynamic dilatational droplet or bubble is used to study the interfacial viscoelasticity of ASPflooding system. The effect of dynamic dilatational viscoelasticity are examined including thefrequency, alkali concentration, alkali types, surfactant concentration, and surfactanttypes.Combined with microscopic oil displacement experiment, the influence of interfacialproperties on the migration of residual oil and oil displacement is researched. It turned outthat:(1) the interfacial tension of asp system relates to alkali concentration, alkali type,surfactant concentration and surfactant types. Alkali in ASP flooding system plays a basefeature and salt effects.(2) Alkali and surfactant influent the oil-water interfacial dynamicdilatational viscoelasticity, the ratio of interfacial dynamic dilatational viscoelasticity decidesto interfacial film’s viscoelastoplastic properties.(3)Under water wet condition, the interfacislproperties of ASP flooding system have certain impact on the starting and migration ofremaining oil and oil displacement effect.