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Pore-scale Simulation of the Effect of Fluid/fluid and Rock/fluid Interactions During Water Injection on the Residual Oil Distribution and Hysteresis

Ebrahimi Nejad, Mehdi | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54307 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobeen
  7. Abstract:
  8. Low salinity water injection is one of the new and important methods of enhancing oil recovery. Experimental studies show the fact that the change in water salinity affects the interfacial properties of water-oil (Fluid-fluid interactions) And the change in wettability that represents the porous media (Rock-fluid interactions) is effective for Oil-recovery. Recently, progress have been made in simulating the process of injecting low-salinity water into the field or core dimensions. However, the simulation of the low salinity water injection process has been much less studied considering the fluid / fluid and fluid / rock interactions at the pore scale. The purpose of this study is to investigate the phenomenon of pore scale mechanism of low salinity water injection performance by Comsol software in porous media that represent reservoir rock. For this purpose, a porous network is obtained which is the result of photographing a thin section of a porous sandy medium using an optical microscope. Simulations were performed for different states of wettability and interfacial tension of fluids, and then the effect of low salinity water injection on the final oil recovery and the effect of hysteresis was investigated. The results of various simulations show that as the surface of the pores becomes more water-wet, more area of the porous media will be swept and the breakthrough time will be delayed and this leads to an increase in oil recovery factor. Also, by investigation the saturation of residual oil under different conditions of interfacial tension in all wetting conditions, the contact angle 30 ° was considered as the optimal angle of wetting in low salinity water injection
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Water Injection ; Pore Scale Simulation of Fluid Flow ; Low Salinity Water Flooding ; Fluid-Rock Ineraction ; Fluid-Fluid Interaction ; Low Salinity/Smart Waterflooding

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