Methane flow rate patterns in mixed-type degassing of coal seam during mining

On the basis of modern theory of gas flow in a manmade porous environment created by impulse plasma treatment of coal seam and from the analysis of actual coal seam gas drainage data, it is recommended to use a mixed-type method of stage-by-stage reduction in coal seam methane content using surface and underground boreholes. The conditions of the mixedtype method of coal seam methane drainage without decrease in the longwall mining equipment productivity and at reduced downtime because of gas emission are justified. Efficiency of the mixed-type methane drainage was estimated using statistical data processing and analysis of in-situ measurement data obtained in 24 operating boreholes within four years. The main research findings are the found dependences between the methane flow rate and time of formation of the flow channels in coal seams: methane flow rate grows in the early period of operation of drainage boreholes and, then, after reaching a maximum, methane emission gradually lowers. Efficiency of the mixed-type coal seam methane drainage method including pre-mine drainage via surface borehole drilling for impulse plasma treatment of coal seam and via directional drilling of holes from underground roadways is validated. The developed approach features the synergistic effect of impulse plasma treatment of coal seams using surface boreholes and the three times reduction in the directional drilling density in the areas of the pre-mine degassing.

Keywords: data analysis, fluid pressure, methane flow rate, gas drainage, impulse plasma treatment, underground roadways, coal seam, borehole.
For citation:

Fryanov V. N., Pavlova L. D., Isachenko A. A., Kornev E. S. Methane flow rate patterns in mixed-type degassing of coal seam during mining. MIAB. Mining Inf. Anal. Bull. 2022;(9):109-119. [In Russ]. DOI: 10.25018/0236_1493_2022_9_0_109.


The study was supported by the Russian Foundation for Basic Research and by the Kemerovo Region, Project No. 20-41-420004.

Issue number: 9
Year: 2022
Page number: 109-119
ISBN: 0236-1493
UDK: 622.817.4
DOI: 10.25018/0236_1493_2022_9_0_109
Article receipt date: 21.01.2022
Date of review receipt: 11.07.2022
Date of the editorial board′s decision on the article′s publishing: 10.08.2022
About authors:

V.N. Fryanov1, Dr. Sci. (Eng.), Professor, Head of Chair, e-mail:, ORCID ID: 0000-0001-6803-458X,
L.D. Pavlova1, Dr. Sci. (Eng.), Professor, Director, Institute of Computer Technologies and Automated Systems, e-mail:, ORCID ID: 0000-0002-2480-8165,
A.A. Isachenko, Cand. Sci. (Eng.), Deputy Chief Engineer of Technology, Branch Mine «Erunakovskaya-VIII» JSC «OUK «Yuzhkuzbassugol», 654006, Novokuznetsk, Russia, e-mail:, 
E.S. Kornev1, Cand. Sci. (Eng.), Assistant Professor, e-mail:, ORCID ID: 0000-0002-1811-6007,
1 Siberian State Industrial University (SibSIU), 654007, Novokuznetsk, Russia,


For contacts:

E.S. Kornev, e-mail:


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