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Experimental Study and Modeling of Thermodynamic Stability of the Oil and Water Emulsions in the Presence of Surfactants And Different Degrees of Temperature

Moeini, Farzaneh | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43169 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghotbi, Cyrus; Taghikhani, Vahid
  7. Abstract:
  8. Always, understanding the properties of crude oil and related phenomena of that has been noticeable matter. Surface tension is one of the important fluid properties and the evaluation of that is essential in oil industry especially in enhanced oil recovery method (EOR) and transport of crude oil by using emulsions.
    In this research, interfacial tension (IFT) was measured via pendant drop method. The effect of three parameters was investigated on IFT for creating of stable oil/water emulsion. These parameters were temperature, concentration of surfactants, and salinity. They were varied between 25-65 ᵒC, 0.05-0.2 gr and 5000ppm respectively. It was used two types of surfactant; acid sulfonic (ionic surfactant) and fatty alcohol (nonionic surfactant).
    Design Expert software was used for designing of experiments.
    Increasing the amount of surfactant decreases IFT and also required time of reaching stable IFT decreases.
    When temperature increases, the minimum IFT was observed for each type of surfactant above critical concentration. While below the critical concentration of surfactant, with increasing temperature IFT decreases. It was observed that the present of salt in solution of ionic surfactant (acid sulfonuic) has synergistic effect on IFT. Then, the predictive model of Cahn gradient theory to get the interfacial tension of the mixture was used. This model can be well predicted the behavior of the surface tension of oil and water systems at high pressures
  9. Keywords:
  10. Crude Oil ; Surface Tension ; Themperature ; Surfactants ; Cahn Gradient Theory

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