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Simulation of Two Phase (Gas-Oil) Flow in 2D Anisotropic Porous Medium on Unstructured Grids by Finite Volume Method

Yazdani, Mehran | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45565 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad; Kazemzade Hannani, Siamak
  7. Abstract:
  8. In this project we focused on Simulation of two-phase (gas-oil) flow in 2D anisotropic porous medium on unstructured grids by finite volume method.Since the permeability assumes to be full tensor, common discretization methods for pressure and flux equations couldn’t satisfy continuity conditions then a new method of discretization named continuous flux approximation introduced.In this new method, cell center pressure calculated by directly applying flux continuity conditions to control volume boundaries. In this project a ninepoint scheme is used, it means that for making the flux continuity conditions over each control volume in two dimensions all neighboring cells are involved.The reason of choosing nine point scheme is because we assume the permeability tensor to be full, which causes the pressure difference in any direction makes fluxes in all directions. To connected flux equation to pressure, pressure support method is employed. Pressure supports are auxiliary control volumes which pressure is assume to be continuous with linear variations all over them.Since in this work we face with anisotropic reservoirs then full pressure supports are used. All discretized terms in this project are cell centered and to increase the flexibility of available code to deal with complex geometries an unstructured triangular grids is employed. Pressure and saturation equations are simultaneously solved by IMPES method. Finally three different type of problems (one phase, two-phase (water-oil) and two-phase (gas-oil)) are solved
  9. Keywords:
  10. Anisotropy ; Unstructured Grid ; Implicit Pressure Explicit Saturation (IMPES) ; Full Permeability Tensor ; Flux Continous Method ; Full Pressure Support

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