DOI: 10.1016/j.jcou.2018.02.002
Scopus记录号: 2-s2.0-85042296906
论文题名: Determination of diffusion coefficients of supercritical CO2 under tight oil reservoir conditions with pressure-decay method
作者: Li S. ; Qiao C. ; Zhang C. ; Li Z.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 24 起始页码: 430
结束页码: 443
语种: 英语
英文关键词: CO2 tight oil reservoir
; Diffusion coefficient
; Equation of state
; Multiple pseudo-components
Scopus关键词: Carbon dioxide
; Crude oil
; Equations of state
; Petroleum reservoir engineering
; Petroleum reservoirs
; Accurate prediction
; Different pressures
; Equation of state
; Lower viscosities
; Oil reservoirs
; Pressure decay method
; Pseudo-components
; Temperature increase
; Diffusion
英文摘要: A generalized methodology has been developed to determine the diffusion coefficients of supercritical CO2 under tight oil reservoir conditions considering the oil swelling effect. Experimentally, a diffusion cell has been used to perform diffusion tests for CO2 in tight formation cores, saturated with crude oil, under different pressure and temperature values. The dynamic pressure-decay curves of CO2 in the annular space of the diffusion cell were monitored and recorded during the measurements. Theoretically, the Peng–Robinson equation of state (PR EOS) with a modified α function has been incorporated to develop a one-dimensional radial diffusion model for the CO2–tight formation core systems. Also, the crude oil sample has been characterized as three pseudo-components for the accurate prediction of phase behavior of the CO2 and crude oil system. The CO2 diffusion coefficients, under different pressure and temperature values, were determined once the discrepancy between the measured and the calculated times, under the same pressure decrease of the diffusion process was minimized. According to the CO2 concentration profiles in the cores, the diffusion process is divided into two distinct parts, i.e., the early stage, characterized by the fast diffusion rate, and the later stage with the slow diffusion rate. While the pressure and the temperature increase, the CO2 diffusion coefficient initially increases quickly and then reaches a plateau. Lower viscosity of crude oil, higher temperature, and higher pressure facilitate the diffusion of CO2 into the crude oil, under tight formation conditions. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111963
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
Recommended Citation:
Li S.,Qiao C.,Zhang C.,et al. Determination of diffusion coefficients of supercritical CO2 under tight oil reservoir conditions with pressure-decay method[J]. Journal of CO2 Utilization,2018-01-01,24