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Effect of Kinetic and Hydrodynamic on Asphaltene Deposition in Porous Media

Soltani Soulgani, Bahram | 2009

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 39781 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davoud; Jamialahamdi, Mohammad; Tohidi, Bahman
  7. Abstract:
  8. Asphaltene are the heaviest components if some crude oil which are in thermodynamic equilibrium. Any change in the equilibrium condition including change in temperature, pressure or composition may render asphaltene to come out of solution and precipitate. Asphaltene precipitation and deposition is one of the main problems in some of the oil fields. Precipitated asphaltene may deposit in the reservoir, near wellbore, wellstring, transport pipeline and surface facilities. In porous media, the deposited asphaltene over the surface and/or across pore throat can severely reduce the effective permeability and results in decreasing of the oil production. Also, the deposited asphaltene results in partial or total blockage of the wellstring and reducing or completely seizing oil production. Asphaltene deposition problems have been experienced in the field for a long time. Although, the asphaltene precipitation has been studied thoroughly and different parameters that effects this process has been investigated but little work has been carried out in the asphaltene deposition across the production system of flowing oil well. This thesis introduces the first study on kinetic of asphaltene deposition and presents the correlation for calculation the asphaltene deposition rate base on thermal methods. The kinetic of asphaltene deposition model in porous media by assisting the developed correlation has been modified. This model has produced more accurate and stable results in simulation of asphaltene deposition and related permeability damages. The new developed model has capability of modelling asphaltene deposition near wellbore due to applying the velocity and temperature terms. A comprehensive study has been performed on the asphaltene deposition in the wellstring. The interval of asphaltene precipitation and different parameters such as well head pressure, tubing size and oil flow rate and their effects on the asphaltene problem has been studied. The developed model has been applied for one of the Iranian oil reservoir, successfully.
  9. Keywords:
  10. Asphaltene ; Precipitation (Chemical) ; Thermodynamics ; Sediments ; Hydrodynamics ; Porous Media ; Kinetics Study

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