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Numerical Simulation of Cold and Hot Water Injection into Naturally Fractured Reservoirs Using the Extended Finite Element Method

Pirmoradi, Pouriya | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53650 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khoei, Amir Reza
  7. Abstract:
  8. The present article studies the isothermal and non-isothermal water injection into naturally fractured oil reservoirs by numerical simulation. The fractures in naturally fractured reservoirs can possess different characteristics. In addition. a remarkable number of naturally fractured reservoirs contain relatively heavy oils that could not be extracted economically; hence. the thermal recovery methods are extensively used for these reservoirs. Hot water injection is one of the thermal recovery methods that has not been explored enough compared to its alternatives. In this study. the effectiveness of the hot water injection over the cold (isothermal) water injection in oil production is quantified. Moreover. the influence of the fractures and their arrangement on oil recovery is discussed. To this end. a 2D model for two-phase fluid flow and heat transfer is presented. The medium is assumed to be partially saturated with water as the wetting phase and oil as the non-wetting phase. The governing equations consist of the energy balance equation together with the continuity equations of both fluid phases. To take the large-scale fractures into account. they are explicitly modeled by the extended finite element method. considering permeable fracture faces; accordingly. the mass and heat transfers between the fracture and the matrix are captured accurately. In contrast. it is more efficient to incorporate the network of the small fractures by an equivalent continuum model. owing to the computational cost. Several numerical examples are presented to demonstrate the influences of injection temperature. initial reservoir temperature. and the large and small cracks on oil production. Furthermore. the simultaneous effects of the fractures and the injection temperature are examined. The results show that the presented model is a promising tool to be used in cold or hot water injection modeling. and it can be employed in the economic feasibility studies of these recovery methods in the future
  9. Keywords:
  10. Hot Water Injection ; Naturally Fractured Reservoir ; Two Phase Flow ; Extended Finite Element Method ; Heat Transfer ; Hydrothermal Method ; Modeling

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