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The Effect of Different Stresses in the Three Principal Directions on a Formation with 30 Degree Fractured

Khalighi, Jafar | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50792 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Goodarznia, Iraj
  7. Abstract:
  8. In this study we investigated the stress effects on the fractured block in formation and its impact on flow through the matrix. At first the effect of various stresses on reduction of sample's pore volume and thereby reduction the permeability have been studied. The equations used to describe the elasticity relations in saturated matrix block is provided by Bayot theory. In this theory, the system of related equations to stress and strain changes have been developed in matrix. We have used finite element method in COMSOL software to solve the equation system created by elasticity relations in formation. After solving the equations, volume and volumetric strain changes which are caused by the various axial and lateral applied forces were obtained. Then the reduction in permeability of the formation was calculated as a result. Due to the new porosity and permeability of the formation, the fluid pressure drop and flow regime around a degrees' fracture is modeled. The flow regime in porous media has been solved by using finite volume method in FLUENT software. Simulation results show that the increase in lateral forces causes the volume reduction in the influenced area of matrix and the fracture and lead to porosity and permeability reduction, which ultimately increases the fluid pressure drop in the porous media
  9. Keywords:
  10. Finite Volume Method ; Finite Element Method ; Elasticity Theory ; Fluid Pressure ; Pressure Drop ; Porosity

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