LAPSE:2023.27202v1
Published Article
LAPSE:2023.27202v1
Laboratory Measurements of the Relative Permeability of Coal: A Review
April 4, 2023
The relative permeability of coal to gas and water is an essential parameter for characterizing coalbed methane (CBM) reservoirs and predicting coal seam gas production, particularly in numerical simulations. Although a variety of studies related to the relative permeability of coals have been conducted, the results hardly meet the needs of practical engineering applications. To track the dynamic development of relative permeability measurements in the laboratory, discover the deficiencies, and discuss further work in this field, this paper investigates the relative permeability measurement preparation work and laboratory methods and summarizes the development of techniques used to determine the water saturation during experimentation. The previously determined relative permeability curves are also assembled and classified according to coal rank and the absolute permeability. It is found that the general operations in the relative permeability measurement process are still not standardized. The techniques applied to determine the water saturation of coal in experiments have been refined to some extent, but no optimal technique has been recognized yet. New techniques, such as the incorporation of high-precision differential pressure gauges, can be used to determine the water production during relative permeability measurement. In addition, the existing relative permeability data are limited, and no study has focused on supercritical carbon dioxide-water and mixed gas (methane and carbon dioxide)-water relative permeability measurements. To meet the requirements of actual projects, further research on this topic must be conducted.
Keywords
Coal, coalbed methane, gas, laboratory experiments, measurement method, measurement technique, relative permeability, Water
Suggested Citation
Shen S, Fang Z, Li X. Laboratory Measurements of the Relative Permeability of Coal: A Review. (2023). LAPSE:2023.27202v1
Author Affiliations
Shen S: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; University of Chinese Academy of Sciences, Beijing 100049, China [ORCID]
Fang Z: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China [ORCID]
Li X: State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
Journal Name
Energies
Volume
13
Issue
21
Article Number
E5568
Year
2020
Publication Date
2020-10-23
ISSN
1996-1073
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PII: en13215568, Publication Type: Review
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