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Experimental Investigation of Molecular Diffusion Coefficients of Gas-Oil for the Iranian Oil Field Fluids

Mirjordavi, Navid | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42056 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Kazemeini, Mohammad; Kharat, Reyaz; Ghazanfari, Mohammad Hossein
  7. Abstract:
  8. Molecular diffusion of gases in crude oils plays a crucial role in several oil recovery processes especially in cold-based production process. Nowadays, heavy oil is a considerable part of the world hydrocarbon reservoirs and its importance increases as the ordinary oil reserves decrease. The main obstacle in heavy oil production is its low mobility (i.e. high viscosity). This difficulty can be easily solved by injecting gas solvent in these reservoirs. However, experimental data concerning CO2 diffusivity in heavy oils due to the tedious nature of diffusivity measurements are relatively rare in the open literature. In this work, a comprehensive experimental investigation of the effective molecular diffusion coefficient determination of CO2-heavy oil systems in both bulk system and homogeneous porous media was studied. The so-called pressure decay method was applied to measure the molecular diffusivity of carbon dioxide in heavy oil. Furthermore, effect of various parameters such as initial pressure, temperature and porous media on molecular diffusion coefficient have been analyzed and based upon experimental results, a new empirical correlation for prediction of CO2-heavy oil molecular diffusion coefficient in presence of porous medium as a function of temperature was proposed
  9. Keywords:
  10. Porous Media ; Effective Molecular Diffusion Coefficient ; Cold-based Production ; Carbon Dioxide-Heavy Oil System ; POROUS MEDIA ; Pressure Decay Method ; Empirical Correlation

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