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Abstract

Summary

Surfactant mixtures, consisting of commercially available zwitterionic and anionic surfactants, have been formulated at low-pH condition to obtain ultra-low interfacial tension (IFT). The surfactant systems show good interfacial performance during IFT measurements and subsequent phase behavior tests. The ultralow IFT (magnitude of 10-3 dynes/cm) is reached by formulating a mixed surfactant system that utilizes the synergism principle between a zwitterionic surfactant with amphoteric quality (amine oxide) and various anionic surfactants.

Over 40 formulas with various surfactant species, surfactant ratio, pH, and salinity were screened. Screening process for the surfactant mixtures was based on IFT measurement using spinning drop tensiometer and qualitative assessment of solubility, followed by phase behavior tests. All the tests were done using dead crude oil sample and under low surfactant concentration (0.3 - 0.5 weight percent). Possible applications of this surfactant system, such as alkali-free chemical flooding and C02-foam flooding, will be discussed.

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/content/papers/10.3997/2214-4609.201601042
2016-05-30
2024-04-19

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Reaching Ultra-low IFT with Low-pH Zwitterionic Surfactant System
Conference Proceedings 2016, 1 (2016); https://doi.org/10.3997/2214-4609.201601042
/content/papers/10.3997/2214-4609.201601042
/content/papers/10.3997/2214-4609.201601042
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