Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal

Joint Authors

Liu, Zhixiang
Liu, Sifei
Wang, Junhui
Wan, Zhijun
Zhang, Hongwei
Wang, Yi
Pei, Qiuyan

Source

Geofluids

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-13, 13 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-09-07

Country of Publication

Egypt

No. of Pages

13

Main Subjects

Physics

Abstract EN

Hydraulic fracturing and premining gas drainage are important to safe mining and coalbed methane extraction.

These technical processes cause the redistribution of in-situ stress and the regional variation of moisture contents within the affected zone.

Therefore, we investigated the coupled effect of variable stresses (from 9 MPa to 27 MPa) and moisture contents (from 0.22% to 4.00%) on the permeability evolution of gas-saturated raw coal.

The results show that (1) the relationship between the mean effective stress and the permeability can be described by a power function according to the permeability evolution model of the porous matrix established in this study.

Besides, the influence mechanisms of moisture on fitting coefficients in the function were analyzed.

(2) The permeability decreases with the increase of in-situ stress (e.g., confining pressure or volumetric stress) in a negative exponential manner.

(3) The curves of permeability variations with moisture content are not always linear, and the permeability is more sensitive to the moisture content than the volumetric stress in the test range.

Moreover, the sensitivity of permeability varies in different regions.

These results would be beneficial for permeability prediction and surface well parameters design.

American Psychological Association (APA)

Wang, Junhui& Wan, Zhijun& Wang, Yi& Liu, Zhixiang& Liu, Sifei& Zhang, Hongwei…[et al.]. 2020. Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal. Geofluids،Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1165755

Modern Language Association (MLA)

Liu, Zhixiang…[et al.]. Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal. Geofluids No. 2020 (2020), pp.1-13.
https://search.emarefa.net/detail/BIM-1165755

American Medical Association (AMA)

Wang, Junhui& Wan, Zhijun& Wang, Yi& Liu, Zhixiang& Liu, Sifei& Zhang, Hongwei…[et al.]. Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal. Geofluids. 2020. Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1165755

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1165755