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Energies 2018, 11(6), 1495; https://doi.org/10.3390/en11061495

The Effect of Oil Properties on the Supercritical CO2 Diffusion Coefficient under Tight Reservoir Conditions

College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
These authors contributed equally to this work.
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Received: 18 May 2018 / Revised: 5 June 2018 / Accepted: 6 June 2018 / Published: 8 June 2018
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Abstract

In this paper, a generalized methodology has been developed to determine the diffusion coefficient of supercritical CO2 in cores that are saturated with different oil samples, under reservoir conditions. In theory, a mathematical model that combines Fick’s diffusion equation and the Peng-Robinson equation of state has been established to describe the mass transfer process. In experiments, the pressure decay method has been employed, and the CO2 diffusion coefficient can be determined once the experimental data match the computational result of the theoretical model. Six oil samples with different compositions (oil samples A to F) are introduced in this study, and the results show that the supercritical CO2 diffusion coefficient decreases gradually from oil samples A to F. The changing properties of oil can account for the decrease in the CO2 diffusion coefficient in two aspects. First, the increasing viscosity of oil slows down the speed of the mass transfer process. Second, the increase in the proportion of heavy components in oil enlarges the mass transfer resistance. According to the results of this work, a lower viscosity and lighter components of oil can facilitate the mass transfer process. View Full-Text
Keywords: oil properties; diffusion coefficient; supercritical CO2; Peng-Robinson equation of state (PR EOS) oil properties; diffusion coefficient; supercritical CO2; Peng-Robinson equation of state (PR EOS)
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Zhang, C.; Qiao, C.; Li, S.; Li, Z. The Effect of Oil Properties on the Supercritical CO2 Diffusion Coefficient under Tight Reservoir Conditions. Energies 2018, 11, 1495.

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