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Numerical Modeling of Linear and Nonlinear Flow in Saturated Fractured Porous Media

Nayer, Reza | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41337 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Pak, Ali
  7. Abstract:
  8. Study of fluid flow through the porous fractured media is used in many branches of science such as oil production, environment, water resources, geotechnics and mining, and the results of these researches are useful for industries.The porous fractured media consist of two main parts each having different roles. The first is the fracture networks that act as channels to conduct the fluid in the media, and the second is the porous media that act as a storage space for the fluid. The differences of dimensions and ability of fluid conduction between these two parts would cause the flow analysis to be performed in a heterogeneous and non-isotropic media. Moreover, the irregular networks of fractures increase the complication of analysis.Transient fluid flow in fully saturated porous fractured media has been studied in this thesis. The theory is based on discrete fractured method where mechanical and hydraulic specifications of individual fractures have been considered in the analysis. For modeling, coupled hydro-mechanical equations have been used for both porous matrix and fractures. In matrix, Darcy equation has been used for flow analysis and the mechanical equations was based on linear elastic theory. In fractures, the theory of parallel plates has been used for flow analysis and deformations have been calculated by spring method. Also, changes of conductivity and possibility of occurrence of turbulent flow and their effects on hydraulic specifications have been considered.In this thesis, modeling has been performed by FLAC V. 4.00 software. Considering that all aspects of this thesis cannot be modeled only by this software, several FISH subroutines have been added to the main program. Verification of these subroutines has been carried out by comparing the modeling results against theoretical values. Finally the practical examples used in oil industries have been solved and results of a parametric study are given
  9. Keywords:
  10. Porous Media ; Crack ; Turbulent Flow ; Transition Flow ; Refraction ; Parallel Plate

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