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Non-equilibrium Modeling of Oil Recovery by Gravity Drainage in Fractured Porous Media

Jahanbakhshi, Saman | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43289 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Ghazanfari, Mohammad Hossein; Masihi, Mohsen
  7. Abstract:
  8. In this work a generalized non-equilibrium model of three-phase flow in porous media including gravity as well as capillary terms is developed and used for analysis of Riemann’s problem in several three-phase systems. The proposed model uses the extension of Barenblatt model to three-phase systems considering dynamic effects in both relative permeability and capillary pressure functions. We compare the solution of the Riemann’s problem when non-equilibrium effects are included. While equilibrium formulation develops unstable oscillatory solution in the elliptic region, non-equilibrium solution is smooth and stable. The proposed non-equilibrium model is validated by the experimental data of two phase gravity drainage available in the literature. Close agreement observed between the model results and experimental data proved that the non-equilibrium assumption is completely reliable for modeling of multiphase flow in porous media. We also study the three-phase creeping flow of water, oil, and gas layers in the corner of angular capillaries. The results disclose that there is a significant coupling between the wetting and the intermediate layers. Generalized mobilities are obtained by simultaneous solution of the co-current and counter-current flow of water and oil layers. At the end, a simple heuristic model is presented to model the generalized mobilities as a function of layer geometry and viscosity ratios
  9. Keywords:
  10. Three Phase Flow ; Porous Media ; Pore-Scale Model ; Gravity Drainage Mechanism ; Non-Equilibrium Modeling ; Flows Coupling

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