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Effect of Gas Adsorption on the Application of the Pulse-Decay Technique
Joint Authors
Shen, Nao
Li, Xiaochun
Shen, Shaicheng
Fang, Zhiming
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-10-05
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
The permeability of coal is an indispensable parameter for predicting the coalbed methane (CBM) and enhanced CBM (ECBM) production.
Considering the low permeability characteristics of coal, the permeability is usually measured by the transient technique in the laboratory.
Normally, it is assumed that the calculated permeability will not greatly vary if the pulse pressure applied in the experiment is small (less than 10% of pore pressure) and previous studies have not focused on the effect of the pulse pressure on the measurement permeability.
However, for sorptive rock, such as coals and shales, the sorption effect may cause different measurement results under different pulse pressures.
In this study, both nonadsorbing gas (helium) and adsorbing gas (carbon dioxide) were used to investigate the adsorption effect on the gas permeability of coal measurement with the pulse-decay technique.
A series of experiments under different pore pressures and pulse pressures was performed, and the carbon dioxide permeability was calculated by both Cui et al.’s and Jones’ methods.
The results show that the carbon dioxide permeability calculated by Jones’ method was underestimated because the adsorption effect was not considered.
In addition, by comparing the helium and carbon dioxide permeabilities under different pulse pressures, we found that the carbon dioxide permeability of coal was more sensitive to the pulse pressure due to the adsorption effect.
Thus, to obtain the accurate permeability of coal, the effect of adsorption should be considered when measuring the permeability of adsorptive media with adsorbing gas by the transient technique, and more effort is required to eliminate the effect of the pulse pressure on the measured permeability.
American Psychological Association (APA)
Shen, Shaicheng& Li, Xiaochun& Fang, Zhiming& Shen, Nao. 2020. Effect of Gas Adsorption on the Application of the Pulse-Decay Technique. Geofluids،Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1166116
Modern Language Association (MLA)
Shen, Shaicheng…[et al.]. Effect of Gas Adsorption on the Application of the Pulse-Decay Technique. Geofluids No. 2020 (2020), pp.1-11.
https://search.emarefa.net/detail/BIM-1166116
American Medical Association (AMA)
Shen, Shaicheng& Li, Xiaochun& Fang, Zhiming& Shen, Nao. Effect of Gas Adsorption on the Application of the Pulse-Decay Technique. Geofluids. 2020. Vol. 2020, no. 2020, pp.1-11.
https://search.emarefa.net/detail/BIM-1166116
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1166116