Measurement of Microemulsion Viscosity and Its Implications for Chemical Enhanced Oil Recovery
- Mohsen Tagavifar (University of Texas at Austin) | Sumudu Herath (University of Texas at Austin) | Upali P. Weerasooriya (University of Texas at Austin) | Kamy Sepehrnoori (University of Texas at Austin) | Gary Pope (University of Texas at Austin)
- Document ID
- Society of Petroleum Engineers
- SPE Journal
- Publication Date
- February 2018
- Document Type
- Journal Paper
- 66 - 83
- 2018.Society of Petroleum Engineers
- microemulsion viscosity, rheometry, co-solvent, polymer, viscosity model
- 7 in the last 30 days
- 581 since 2007
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The rheological behavior of microemulsion systems was systematically investigated with mixtures of oil, brine, surfactant, cosolvent, and in some cases polymer to determine their effects. A microemulsion-rheology model was developed and used to interpret the experimental results. The optimal microemulsion/oil-viscosity ratio without cosolvent was roughly 5:6, but it can be reduced to a more favorable ratio of approximately 2 by adding cosolvent. Even though the amount of cosolvent needed is case dependent, a clear trend of microemulsion-viscosity reduction with increasing cosolvent concentration was observed. Limited evidence suggests that large hydrolyzed polyacrylamide (HPAM) molecules with a narrow molecular-weight (MW) distribution have negligible partitioning to Type II and Type III microemulsions.
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