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Study the Effect of Specific Salt Ions on Interfacial Tension of Water (Lowsalinity/Smart) and Reservoir Fluid in Surface Tension Reducing Materials Flooding by Molecular Dynamic Simulation

Zeighami, Amir Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55318 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ayatollahi, Shahabodin
  7. Abstract:
  8. Water injection is known as one of the most efficient and affordable techniques to displace the oil in the reservoirs. To increase oil recovery efficiency through water injection operation, recently low salinity water injection or water containing a certain amount of effective ions (engineered/low salinity water) is proposed. Besides, improving this technique is also adopted in the oil industry using certain chemicals like surfactants to change the interfacial tension or rock wettability for more oil recovery. In order to study and model the mechanisms involved during surfactant flooding, molecular dynamics simulation is utilized here as a novel technique. The advantage of this method over other modeling and laboratory methods is that it provides the possibility of studying the behavior of materials at the molecular scale as well as studying the dynamics of different processes and how the process is performed. This would result in in-depth analysis and interpretation of the effects of the effective components at the molecular state. In this study, molecular dynamics simulations using Lampes software have been used to investigate the effect of ions in saline water on the performance of surfactants. Sodium and magnesium cations are used to model ions in engineered/saline water, and combinations of decane, toluene, and decanoic acid are utilized as the model oil. Anionic surfactants have also been used to check the effect of surface-reducing agents on the performance of chemical flooding in oil reservoirs. The results of the simulations show that the effect of monovalent cation in interaction with surfactants is more than divalent cation and on the other hand, divalent cation has a greater effect on the orientation of surfactants. Acidic compounds increase the effect of ions on the performance of surfactants. Cations have more 5% effectiveness in the presence of acidic compounds.
  9. Keywords:
  10. Molecular Dynamic Simulation ; Interfacial Tension ; Low Salinity Water Flooding ; Surface-Reducing Agents ; Reservoir Fluid Polar Components ; Water Injection ; Enhanced Oil Recovery ; Engineered/Low Salinity Water

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