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Dual Porosity Modeling of Oil-Gas Systems under the Effects of Gravity and Capillary Forces

Taraki, Fateme | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48628 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Taghizadeh Manzari, Mehrdad; Shamloo, Amir
  7. Abstract:
  8. In this thesis, two types of two-phase flow are studied in one dimension. The first type is oil-gas two-phase flow which is miscible and compressible. The second one is oil-water two-phase flow which is immiscible and incompressible. Oil wet and water wet conditions are studied in the second type of flow. Two approaches, i.e. double porosity and double porosity-double permeability, are used to study naturally fractured reservoirs. In these approaches, the matrix and fracture are modeled as two separate media that exchange mass via a transfer function. Black oil model is applied to simulate the fluid system. The governing equations consist of the conservation of mass equations for each component along with the Darcy law. One set of governing equations is used for each medium. The conservation equations are discretized using a finite difference method. The equations are then coupled using a transfer function which acts as a source/sink in each medium. An Implicit Pressure Explicit Saturation (IMPES) method is used to solve the governing equations. The pressure equations obtained for the matrix and fracture media are solved simultaneously using the Gauss-Seidel method. Saturation equations are then solved explicitly. The effects of gravity and capillary, in matrix and fracture, on the recovery and recovery rate are studied for both oil-water and oil-gas systems. In addition, various shape factors were investigated to determine which one matches produces best results compared to a fine grid solution for the oil-gas system. The oil-water simulations were validated using a benchmark solution. The sixth SPE comparative solution project was used to validate the results of oil-gas simulations
  9. Keywords:
  10. Dual Porosity ; Dual Permeability ; Transfer Function ; Naturally Fractured Reservoir ; Implicit Pressure Explicit Saturation (IMPES) ; Miscible Displacement ; Two Phase Flow

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