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Received February 24, 2012
Accepted August 27, 2012
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Inhibition effect of CO2 on asphaltene precipitation for an Iranian crude oil and comparison with N2 and CH4
1School of Chemical Engineering, University of Tehran, Tehran, Iran 2Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran 3Institute of Petroleum Engineering, University of Tehran, P. O. Box 11155-4563, Iran
abahram@ut.ac.ir
Korean Journal of Chemical Engineering, February 2013, 30(2), 429-433(5), 10.1007/s11814-012-0144-7
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Abstract
The effects of N2, CH4 and CO2 injection on asphaltene precipitation have been experimentally investigated using a reservoir oil fluid from south of Iran, making use of light transmission method. The results are compared and the effects of injected gases on reducing asphaltene colloidal stability in oil are found in the following order: CH4> N2>CO2. It is observed that CO2 can act like an inhibitor and can increase the solubility of asphaltene, decreasing the asphaltene precipitation onset. A thermodynamic discussion explains the effect of CO2 on the solubility of asphaltene based on the solubility parameters of recombined oil and CO2, calculated from Peng-Robinson equation of state along with an empirical correlation for volumetric properties of CO2.
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