Next Article in Journal
Development of a Multi-Methodological Approach to Support the Management of Water Supply Systems
Next Article in Special Issue
Study on Hydraulic Incipient Motion Model of Reinforced Tailings
Previous Article in Journal
Spatial Distribution Characteristics and Sources of Nutrients and Heavy Metals in the Xiujiang River of Poyang Lake Basin in the Dry Season
Previous Article in Special Issue
Improvement Effect of Reticular Glass Fibers on the Mechanical Properties of Tailings Sand with the Lenticle (Layered Sandy Soil)
Article

Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine

by 1,†, 2,*, 2,3,*, 1,4,5,*,†, 2 and 4,5
1
State Key Laboratory of Coal and CBM Co-Mining, Jincheng 048000, China
2
College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
3
Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China
4
Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 100083, China
5
School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: David John Williams
Water 2021, 13(12), 1653; https://doi.org/10.3390/w13121653
Received: 22 April 2021 / Revised: 27 May 2021 / Accepted: 10 June 2021 / Published: 13 June 2021
Deep coalbed methane (CBM) is widely distributed in China and is mainly commercially exploited in the Qinshui basin. The in situ stress and moisture content are key factors affecting the permeability of CH4-containing coal samples. Therefore, considering the coupled effects of compressing and infiltrating on the gas permeability of coal could be more accurate to reveal the CH4 gas seepage characteristics in CBM reservoirs. In this study, coal samples sourced from Tunlan coalmine were employed to conduct the triaxial loading and gas seepage tests. Several findings were concluded: (1) In this triaxial test, the effect of confining stress on the permeability of gas-containing coal samples is greater than that of axial stress. (2) The permeability versus gas pressure curve of coal presents a ‘V’ shape evolution trend, in which the minimum gas permeability was obtained at a gas pressure of 1.1MPa. (3) The gas permeability of coal samples decreased exponentially with increasing moisture content. Specifically, as the moisture content increasing from 0.18% to 3.15%, the gas permeability decreased by about 70%. These results are expected to provide a foundation for the efficient exploitation of CBM in Qinshui basin. View Full-Text
Keywords: coal bed methane; permeability; in-situ stress; moisture content coal bed methane; permeability; in-situ stress; moisture content
Show Figures

Figure 1

MDPI and ACS Style

Li, G.; Wang, Y.; Wang, J.; Zhang, H.; Shen, W.; Jiang, H. Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine. Water 2021, 13, 1653. https://doi.org/10.3390/w13121653

AMA Style

Li G, Wang Y, Wang J, Zhang H, Shen W, Jiang H. Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine. Water. 2021; 13(12):1653. https://doi.org/10.3390/w13121653

Chicago/Turabian Style

Li, Guofu, Yi Wang, Junhui Wang, Hongwei Zhang, Wenbin Shen, and Han Jiang. 2021. "Coupled Effects of Stress, Moisture Content and Gas Pressure on the Permeability Evolution of Coal Samples: A Case Study of the Coking Coal Resourced from Tunlan Coalmine" Water 13, no. 12: 1653. https://doi.org/10.3390/w13121653

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop