Abstract
Selective wetting is studied in systems of glass, a nonpolar liquid (dodecane or petroleum), and a sodium dodecyl sulfate solution (or an organosiloxane-in-water emulsion). The displacement of dodecane and petroleum from horizontal glass capillaries and a porous medium (quartz sand) is investigated. The rate and efficiency of dodecane and petroleum displacement depend strongly on the surfactant concentration in the displacing solution. The displacing properties of surfactant solutions and organosiloxane emulsions are compared. The emulsions show much better displacing properties: unlike surfactant solutions with concentrations above the critical micelle concentration, they displace petroleum in the plug-flow mode, without dispersing it into drops.
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