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Correlation between phase behavior and IFT

Correlation between phase behavior and IFT. Leslie Zhang. Phase behavior after 2 months with 0.2% (left) and 0.5% (right) NI blend. Solubility ratios of 0.2% NI blend / 1% Na 2 CO 3 / NaCl. Huh Correlation, 1979. interfacial tension between excess oil or aqueous phase and middle phase,

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Correlation between phase behavior and IFT

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  1. Correlation between phase behavior and IFT Leslie Zhang

  2. Phase behavior after 2 months with 0.2% (left) and 0.5% (right) NI blend.

  3. Solubility ratios of 0.2% NI blend / 1% Na2CO3 / NaCl

  4. Huh Correlation, 1979 interfacial tension between excess oil or aqueous phase and middle phase, Rl3: solubility ratio of oil or water by surfactant c: a constant with a typical value of 0.3.

  5. Comparison of IFT measured by spinning drop measurements using standard procedure and that estimated by Chun-Huh correlation of 0.2% NI blend/1% Na2CO3/NaCl. c=0.3.

  6. Solubility ratios of 0.5% NI blend / 1% Na2CO3 / NaCl

  7. IFT estimated by Chun-Huh correlation of 0.5% NI blend/1% Na2CO3/NaCl, c=0.3.

  8. Phase behavior of 0.2% NI blend/1% Na2CO3/x% NaCl, 40 days of settling. Thin creamed oil-rich layers exist at salinity of 2-3.4% NaCl.

  9. Conclusions • The measured low IFT over a wide range of salinity is consistent with the solubility ratio data. • The thin layer of oil-rich emulsion may be responsible for the above observation. • The dependence of this layer on the amount of oil present suggests that it may be due to the presence of the naphthenic soaps.

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