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Pore Scale Simulation of the Fluid/Fluid and Fluid/Rock Interactions on the Performance of Water Injection

Mousavi, Mohammad Javad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52596 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fatemi, Mobin; Pishvaie, Mahmood Reza
  7. Abstract:
  8. Two-phase fluid flow physics in porous media is applied in various fields. Studies have shown that wettability and surface tension, which represent fluid-rock and fluid-fluid interactions, have a significant effect on the dynamics of the immiscible displacement. Although the effects of wettability and surface tension on the macroscopic behavior of fluid flow are known, there is less understanding of it at the micro scale. Considering the essential role of wettability and surface tension in various fields, this project seeks to investigate the effects of wettability and surface tension on the movement and distribution of fluids and the dominant displacement mechanisms within the porous media at the micro-scale. The macroscopic behavior of the fluids can be justified by performing simulations in both two-pore model and micro-model. In this project, water injection simulation, which represents immiscible displacement, is performed by computational fluid dynamics. In this way, the Navier-Stokes equations will be solved with the volume of fluid method in different dimensions (two-pore and micromodel). Simulations were performed in both models from strongly water-wet to strongly oil-wet at different surface tension. In the two-pore model, more detailed investigations of the mechanisms of displacement, fluid distribution, snap-off, and flow of the fluid film were investigated. In the larger model (micro-model), fingering, bypassing, oil ganglia formation and oil production at different wettability and surface tension were investigated and justified on the basis of the observations obtained from the smaller model. In the two-pore model, the snap-off occurred in a highly water-wet state due to non-piston displacement and wetting fluid film flow. As a result, oil is trapped and oil recovery is reduced. As the oil wetness of surface increases, the oil layer on the walls becomes more noticeable. In the micromodel, as the wettability changes, the difference in oil production and residual fluid distribution change as a result of the fluid distribution and the fluid behavior. So that the formation of snap-off and the flow of the fluid film in some contact angles is clearly seen. Simulation results show that at the micro scale, wettability has a greater effect than surface tension on the flow and behavior of the fluids and their distribution and residual value. Also from the plot of residual oil saturation at different angles, it was observed that the highest oil production occurred in the slightly water-wet state (30° in the two-pore model and 45° in the micro-model) and decrease in production in the highly water-wet state due to snap-off occurrence. Also, the final production for the highly water-wet state is higher than that of the highly oil-wet state. In addition with surface tension reduction, production increased. Overally, the trend of changes and diagrams was consistent with previous results. Ultimately, this project enhances the reader's understanding of fluid flow in the porous media and eases the way for further studies in the porous media
  9. Keywords:
  10. Simulation ; Wetting ; Surface Tension ; Computational Fluid Dynamics (CFD) ; Fluid Flow in Porous Media ; Immiscible Two-Phase Flow

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