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Investigating the Dynamic behavior of Fracture Networks using Percolation Theory

Barati, Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51452 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Masihi, Mohsen; Jamshidi, Saeed
  7. Abstract:
  8. Most of petroleum reservoirs of Iran are fractured reservoirs which has different properties, geometrical structure and drive mechanism in comparison with conventional reservoirs. The major difference is the existence of interaction between fractures and matrix respectively with a high and very low permeable (or imperable) medi. One simulation method for these fractures is discrete fracture network (DFN) modeling which is used in this study to investigate dynamic properties of these fractures. In this study, matrix is assumed as an impermeable media then dynamic properties like effective permeability of fracture network for different realization reservoirs are calculated and and evaluated by law scaling of percolation theory. In order to create the model, fractures with equal length and random orientation were used in different system length then percolation parameters were obtained. Also, percolation threshold were obtained for these kind of systems with infinite length and it revealed that percolation threshold is inversely proportional to the system size. Fracture connectivity for systems with different length was investigated too. To obtain fracture backbone which the main flow pass through it minimum flow of three percent of total flow was used as flow threshold. By applying finite size scaling law and using of permeability results in different system size, universal curves of fractured network were obtained which can be used to obtain fractured network permeability for other system size with no simulation data
  9. Keywords:
  10. Anisotropy ; Fractured Reservoirs ; Percolation Theory ; Dynamic Behavior ; Slotted Network ; Scaling Law

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