DOI: 10.1016/j.jcou.2016.12.011
Scopus记录号: 2-s2.0-85007494775
论文题名: In-situ disposal of CO2: Liquid and supercritical CO2 permeability in coal at multiple down-hole stress conditions
作者: Vishal V.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2017
卷: 17 语种: 英语
英文关键词: Effective stress
; Indian coal
; Liquid CO2
; Permeability
; Supercritical CO2
Scopus关键词: Bituminous coal
; Climate change
; Coal
; Gas permeability
; Geology
; Liquids
; Mechanical permeability
; Coal matrix shrinkage
; Effective stress
; Global climate changes
; Indian coals
; Liquid CO
; Permeability evolution
; Supercritical CO
; Volumetric deformation
; Carbon dioxide
英文摘要: Geological CO2 sequestration is one of the most effective methods to counter global climate change. Coal matrix shrinkage, swelling, gas diffusion and permeability are the key phenomena associated with geological CO2 disposal in coal. In this study, permeability experiments were approached using the supercritical and liquid phases of CO2 (less understood; most likely insitu phases) for naturally fractured bituminous coal. Experiments were performed under triaxial conditions using four sets of various confinement conditions corresponding to variable depths. Injection pressure was varied gradually and the permeability changes were calculated using the Darcy’s equation for subcritical and supercritical CO2 exclusively. Changes in CO2 phases were obtained by changing the system temperature from 26° C for liquid CO2 to 34°C for supercritical CO2. N2 was alternatively injected at the start and between the injections of CO2 to analyze the changes in the permeability from a relatively very less sorptive medium’s perspective. It was observed that the supercritical CO2 flow reduced the permeability significantly and this behavior was greatly attributed to the highly viscous nature of the supercritical phase and the high volumetric deformation or the swelling of coal under supercritical CO2 as compared to liquid CO2. The injection pressures were observed to reduce the effective stress behavior, which in turn pushed the permeability evolution at each confinement to a positive trend. However, the permeability of CO2 reduced exponentially with increasing effective stresses. Two different empirical equations were proposed for permeability of both the phases of CO2 with effective stresses. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52821
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Vishal V.. In-situ disposal of CO2: Liquid and supercritical CO2 permeability in coal at multiple down-hole stress conditions[J]. Journal of CO2 Utilization,2017-01-01,17