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Comparison and Evaluation of the Performance of some Fundamental Models for Simulation of Naturally Fractured Hydrocarbon Reservoirs

Mahmoudi, Siamak | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44520 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad
  7. Abstract:
  8. Fractured reservoirs show a different behavior from common reservoirs because of the existence of a broad network of fractures. This phenomenon makes it necessary to apply special methods for fractured reservoirs in the procedure of reservoir simulation. Since twenty percent of petroleum content in the world is buried in fractured reservoirs, investigating these reservoirs is of great importance.
    The first step in simulation of these kinds of reservoirs is to come up with a geometrical model which can be used to take the fracture network influence into account. In the course for reaching such an objective, various models have been developed which are based on specific assumptions and in result can be applied to solve specific problems. Considering the fact that these assumptions sometimes overlap and different models can be used for a specific problem, there is a need for comparing the functionality of these models.
    In this study, three major cases of incompressible single-phase fluid, slightly compressible single-phase fluid and incompressible two-phase fluid are considered and one specific problem is solved using different models in these cases. Furthermore, to achieve a better observation, the unfractured reservoir is also studied. Herein, contrary to dual permeable assumption in which the fluid is considered to flow through the fracture network and matrix simultaneously, dual porosity assumption in which the flow occurs only via the fracture network is applied. In each case, equations for finding pressure field and saturation are solved by numerical method. Equations are discretized by finite difference method and the derived systems of equations are solved using BiCGSTAB method. Finally, three-dimensional pressure distributions are presented for some cases and in order to have a better observation of the differences between various cases, two-dimensional changes along the diagonal of the domain, are investigated. It is observed that Zhang transfer function leads to the most acurate results in single-phase incompressible flow and Warren-Root model leads to the least acurate results in two-phase incompressible flow
  9. Keywords:
  10. Porous Media ; Dual Porosity ; Finite Difference Method ; Fractured Reservoirs ; Dual Permeability

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