DOI: 10.1016/j.jcou.2018.09.007
Scopus记录号: 2-s2.0-85053269366
论文题名: The effect of permeability on supercritical CO2 diffusion coefficient and determination of diffusive tortuosity of porous media under reservoir conditions
作者: Li S. ; Qiao C. ; Li Z. ; Hui Y.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 28 起始页码: 1
结束页码: 14
语种: 英语
英文关键词: CO2
; Diffusion coefficient
; Permeability
; Pore radius
; Tortuosity
Scopus关键词: Carbon dioxide
; Equations of state
; Mechanical permeability
; Petroleum reservoir engineering
; Pore structure
; Diffusivity coefficient
; Fick's diffusion equation
; Mass transfer process
; Peng-Robinson equation of state
; Pore radius
; Pore radius distribution
; Pressure decay method
; Tortuosity
; Diffusion
英文摘要: A general method for determining the diffusivity coefficient of supercritical CO2 in cores saturated with oil is presented in this paper. Theoretically, a mathematical model including Fick's diffusion equation and Peng-Robinson Equation of State (PR EOS) is proposed to evaluate the mass transfer of CO2 in the cores with different permeabilities. Experimentally, the pressure-decay method is employed by monitoring the CO2 pressure in the diffusion cell during diffusion experiments. The CO2 diffusion coefficients in the cores with different permeabilities are determined when the discrepancy of the calculated and measured pressure-decay curves has been minimized. The diffusion coefficient of supercritical CO2 increases gradually with rising permeability at the range of 0.1-10 mD, and then it reaches a plateau at the permeability range of 10-300 mD. The impact of the permeability on the CO2 diffusion coefficient is attributed to the pore radius and pore structure of the cores. The Pore radius of the core whose permeability is less than 10 mD is less than 1 μm, and pore walls restrict CO2 mass transfer under such condition, which accounts for the relative low diffusion coefficient. When the permeability exceeds 10 mD, the pore radius is larger than 1 μm, and the influence of the solid boundary is negligible. Moreover, the textural coefficients of cores decrease with the permeability, which shows that the less tortuous pore structure facilitates the mass transfer process. Diffusive tortuosities for the cores with different permeabilities are determined by using the CO2 diffusion coefficients in porous media and bulk phase, which show the same trend with the pore radius distribution. © 2018 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111762
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: College of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, 266580, China; First Oil Production Plant, Daqing Oilfield, 163000, China
Recommended Citation:
Li S.,Qiao C.,Li Z.,et al. The effect of permeability on supercritical CO2 diffusion coefficient and determination of diffusive tortuosity of porous media under reservoir conditions[J]. Journal of CO2 Utilization,2018-01-01,28