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Experimental Investigation of Enhanced Imbibition of Low Salinity/Smart Water in Fractured Porous Media: Effect of Fluid/Fluid and Rock/Fluid Interactions

Javadi, Amir Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54337 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobeen; Masihi, Mohsen
  7. Abstract:
  8. Many of oil reservoirs in Iran that are fractured, do not have high Recovery Factor (RF), therefor Enhanced Oil Recovery (EOR) methods are exerted in them. In fractured reservoirs, due to high capillary pressure in matrix and low amount of it in fracture, the wetting phase tends to imbibe to the matrix from the fracture. Altering the wettability of reservoir rock from Oil-Wet (OW) to Water-Wet (WW) enables the injected water to imbibe to matrix and sweep its oil. Also reducing oil/water IFT turns oil to small droplets, helps them to pass narrow pores and be produced. In one of the new EOR methods called chemical EOR, chemical additives are injected to the reservoirs along with water to reduce IFT and make the wettability OW. The aim in this study is to use a chemical doing this act.In this study a surfactant named CTAB was used for this aim. To investigate its effect on wettability alteration, 5ppm of it was added to 3 salt waters which were sea water, 10 times diluted sea water and 2 times concentrated sea water and contact angle tests were conducted on OW surfaces. Salt waters containing surfactant have much more power to alter the wettability in comparison with those without surfactant. Then to see their role in reducing IFT, some IFT tests were done. Finally in order to see the solutions behavior in fractured porous mediums, secondary and tertiary dynamic micromodel tests were conducted in which the solutions containing 1000ppm surfactant were injected to the model with the rate of 0.0006ml/min. in tertiary tests, at first two PVs of salt waters without surfactant were injected then two PVs of the with surfactant.As it became clear that surfactants had a significant rule in changing the wettability, they also reduced the IFT conspicuously and also in micromodel tests, it was visible that presence of surfactant increases the injected solution imbibition from fracture to matrix and enhances oil recovery. In this study, sea water containing surfactant brought the best results in RF
  9. Keywords:
  10. Fractured Reservoirs ; Surfactants ; Wettability ; Interfacial Tension ; Capillary Pressure ; Enhanced Oil Recovery ; Fluid-Fluid Interaction

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