Abstract
In the present study, three types of experiments on immiscible CO2 flooding in porous media were conducted and high-resolution images of asphaltene precipitation obtained using X-ray micro-CT scanner. It was found that the effective oil mobility is reduced due to the adsorption of deposited asphaltene onto the rock which blocks the pore throats, whereby the formation wettability is changed and both the effective porosity and permeability are reduced. The deposited asphaltene cannot be redissolved or displaced by the reinjected crude oil, and the formation damage is irreversible. In addition, the porosity-based permeability model was applied to study the effective permeability reduction that results from porosity reduction. The porosity-based permeability was calculated based on the Kozeny–Carman equation and experimental data. The effective permeability variation rate obtained by the porosity-based permeability model agreed well with the results obtained by Darcy’s law, which demonstrates that the method is feasible in evaluating the effective permeability variation rate based on the porosity of the cores acquired from micro-CT images.
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Acknowledgments
The authors are grateful for the support provided by the National Natural Science Foundation of China (Grant No. 51206018, 51227005), the Major Program of National Natural Science Foundation of China (51436003), the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20120041120057), the Ph. D. Startup Foundation of Liaoning Province (Grant No. 20121022), and the Fundamental Research Funds for Central Universities.
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Zhao, Y., Wang, T., Song, Y. et al. Visualization of asphaltene deposition effects on porosity and permeability during CO2 flooding in porous media. J Vis 19, 603–614 (2016). https://doi.org/10.1007/s12650-016-0346-x
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DOI: https://doi.org/10.1007/s12650-016-0346-x