1Faculty of Petroleum Engineering, Petroleum University of Technology, Ahwaz, I.R. IRAN
2Institute of Thermodynamics and Thermal Engineering, University of Stuttgart, Stuttgart, GERMANY
3School of Engineering, University of Kansas, Lawrence, USA
In this work, the precipitation and re-dissolution of asphaltenes were studied for an Iranian relatively heavy crude oil. A series of experiments were designed and carried out to quantitatively examine the reversibility of asphaltenes precipitation upon the change in the solvent concentration along with the temperature. n-Heptane was used as the precipitant, and a temperature range of 30 to 70°C was applied to perform the temperature reversibility tests. Experiments were conducted in both porous and non-porous media. As a porous medium, a slim tube apparatus was used which is a one- dimensional model reservoir. Generally, the experiments showed that the precipitation is completely reversible for oil under study upon both composition and temperature changes.
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