The Effect of Oil Properties on the Supercritical CO 2 Diffusion Coefficient under Tight Reservoir Conditions

Chao Zhang, Chenyu Qiao, Songyan Li and Zhaomin Li
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Chao Zhang: College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
Chenyu Qiao: College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
Songyan Li: College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China
Zhaomin Li: College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China

Energies, 2018, vol. 11, issue 6, 1-20

Abstract: In this paper, a generalized methodology has been developed to determine the diffusion coefficient of supercritical CO 2 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 CO 2 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 CO 2 diffusion coefficient decreases gradually from oil samples A to F. The changing properties of oil can account for the decrease in the CO 2 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.

Keywords: oil properties; diffusion coefficient; supercritical CO 2; Peng-Robinson equation of state (PR EOS) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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