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Multirate Transfer Functions in Dual Porosity-Dual Permeability Models in Simulation of Naturally Fractured Reservoirs in 2D Two Phase Water-Oil System

Rezaei, Sajjad | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49547 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghi Zade Manzari, Meherdad; Afshin, Hossein; Kazemzadeh Hannani, Siamak
  7. Abstract:
  8. Naturally Fractured Reservoirs (NFRs) play an important role in petroleum industry and the global economy.. The reservoirs of the most complex geological structures in petroleum engineering science, on the other hand the largest sources of hydrocarbons are considered throughout the world and especially in our country. Therefore, characterization and modeling them frst step to develop best practices for hydraulic fracturing gap, optimal design of production Method and evaluate potential reservoirs. Physics of the present work is 2D two-phase immiscible flow under gravittational effect through fractured porous media and the most practical formulas for transfer function in dual porosity-dual permeability models have been implemented for numerical simulation of naturally fractured reservoir.which are compared using a benchmark problem and the effects of gravity, capiliary, number of submatrix block subdomains and dual continuum media model are studied.the benchmark problem was adopted from Gilman(1986) and involves water injection into a naturally fracture reservoir with 10 matrix blocks.In addition to two-dimensional geometry with a special fracture distribution, multi-rate transfer function is used and the results of the geometric model has been validated with discrete fracture model. in comparison of the model, parameters, such as cumulative oil production. distribution of saturations in matrix and fractures, and computational time of numerical solution are investigated. A fnite volume method along with the so-called IMPES algorithm is used for solving the governing equations. the time-steps are variable in the IMPES algorithm while pressures in matrix and fractures are calculated explicity. Boundary conditions of the reservoir are no-flow and wells are modeled based on Peaceman model. According to the results of the present work, differences and similaritis of the models are determinded. weaknesses of each model are illustrated and suitable models for handling gravitational effects are recommended
  9. Keywords:
  10. Naturally Fractured Reservoir ; Two Phase Flow ; Dual Porosity-Dual Permeability Model ; Simulation of Oil Tanks ; Multirate Transfer Function

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