Permeability Impairment Study Due to Asphaltene Deposition: Experimental and Modeling Approach |
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Authors: | Seyed Hamed Bolouri Eshragh Ghoodjani |
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Institution: | (1) School of Energy Resource, China University of Geosciences, Xueyuan Road No. 29, Haidian district, Beijing, 10083, China;(2) China University of Petroleum, East China, 257061 Dongying, Shandong Province, China |
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Abstract: | This fact is well known that during any scenario of production, asphaltene deposition in porous media has a substantial effect
on oil flow. But a clear understanding of asphaltene deposition mechanisms can help to minimize asphaltenic problem in oil-bearing
formations. In this study, the experimental results of three dynamic CO2 miscible injection tests were investigated. Regarding the effects of adsorption, mechanical entrapment, and sweeping mechanisms
on permeability behavior, a mathematical mass and permeability variation model were developed. According to the experimental
results asphaltene deposition causes a 70% loss of sand stone initial permeability while the loss is significantly low in
carbonate cores, about 30%. The model validation shows that the main particulate processes of Asphaltene deposition in sandstone
cores are the cake forming and adsorption while in the case of carbonate cores, are the gradual pore blocking and pore sweeping.
Obtained results from mass model provide that entrainment and deposition coefficients in square mass model lead to a more
flexible trend than the linear variation of general model. |
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