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Microscopic Investigation of Asphaltene Precipitation during Water flooding Process at Laboratory Condition

Arastuian, Nahid | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53919 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahaboddin; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. The study of low-salinity water flooding or smart water flooding as secondary or tertiary oil recovery methods started in 1960 and many researchers have studied the effect of ions types on asphaltene precipitation/deposition during the injecting water into the oil reservoirs. To reduce the asphaltene challenges, one needs to properly investigate this phenomenon and better understanding of the cause of precipitation. It is already known that the amount of asphaltene deposition can be reduced by controlling the deposition criteria. For example, water microemulsion in the oil phase would cause the asphaltenes to be adsorbed on the water oil interface by hydrogen bonds due to heteroatom structure of the asphaltene molecules. Besides, the presence of salts in the aqueous phase and their concentration affect asphaltene absorption at the interface. In this study, the effect of chloride salts in injected water and the ionic strength of different brine on the amount of asphaltene deposition was investigated using a QCM device. The results presented in this study show that the use of monovalent cations compared to divalent ions in saline water causes less deposition of asphaltenes dissolved in model causing higher stability. Investigating the effect of microemulsion of water in the oil phase using water samples with different ionic strengths that lead to asphaltene precipitation onset point, the role of cations in terms of ionic valency and concentration on asphaltene precipitation has been emphasized
  9. Keywords:
  10. Asphaltene Precipitation ; Flamingo ; Low Salinity/Smart Waterflooding ; Secondary Recovery ; Microemulsion ; Quartz Crystal Microbalance (QCM)Experiments

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