AS Ultra-Low-IFT Surfactant: Mobilizing Residual Oil Through Interfacial Control
Explain how AS reduces oil-water interfacial tension to ≤1.0×10⁻² mN/m, lowers capillary resistance, and improves chemical-flooding recovery performance.
Article Summary
After primary production and secondary waterflooding, a substantial fraction of oil remains trapped in micron-scale pores by capillary forces. eMAI™ AS adsorbs at the oil-water interface and forms a stable molecular layer that lowers interfacial free energy.
At a recommended concentration of 100–200 ppm in a kerosene system at 30°C, interfacial tension can reach ≤1.0×10⁻² mN/m, reducing capillary resistance, lowering residual-oil mobilization pressure, and improving displacement efficiency. AS has more limited salt tolerance than the AC series and should be validated in the actual salinity and calcium/magnesium conditions; it can be combined with polymers or alkali in ASP, surfactant, or polymer-assisted flooding when compatibility is confirmed.
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