Testing of integrated degasifying treatment technology based on hydraulic splitting of coal seam using surface holes

Construction of a highly efficient flow chart for the integrated underground degasifying treatment of coal seams towards intensive and safe mining is described. The integrated degasification technology assumes the initial-stage hydraulic splitting of a treated coal seam using surface holes, then hydraulic fracturing (splitting) of less treated coal seam using holes drilled from roadways and methane recovery from the generated highly permeable coal–gas reservoir via standard in-mine drainage boreholes. The developed technology also provides methane drainage under high strata pressure by inducing methane migration along highly permeable coal–gas reservoir created by hydraulic fracturing, from rock mass to temporary roadways, and further removal of methane with ventilating current during longwall airing. The full-scale testing of the improved hydraulic fracturing technology is described, the mode of hydraulic treatment of coal and rocks is found, and the interconnection between hydrofractures created from surface and underground boreholes is determined. The mechanism of a promising flow chart for the improvement of the hydraulic fracturing technology through achieving the self-sustained coal destruction by hydrodynamic impact, which can greatly enhance mine drainage efficiency, especially in highly outburst-hazardous coal seams, is considered. The integrated mine drainage tested in some extraction panels in the Kirov Mine substantially abates face output constraints by gas criterion, cuts down idle time of mining machines and enhances safety of underground mining.

Keywords: integrated mine drainage, hydraulic splitting of coal seam using surface holes, hydraulic fracturing from underground roadways, standard mine drainage, mechanism of gas content reduction in longwalls, mine tests, technology improvement self-sustained coal destruction effect, outburst hazard reduction.

For citation:

Slastunov S. V., Mazanik E. V., Sadov A. P., Khautiev A. M.-B. Testing of integrated degasifying treatment technology based on hydraulic splitting of coal seam using surface holes. MIAB. Mining Inf. Anal. Bull. 2020;(2):58-70. [In Russ]. DOI: 10.25018/0236-1493-2020-2-0-58-70.

Acknowledgements:

About authors:

S.V. Slastunov, Dr. Sci. (Eng.), Professor, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia, e-mail: slastunovsv@mail.ru,
E.V. Mazanik¹, Cand. Sci. (Eng.), Director of the Aerological Safety of Underground Mining, e-mail: mazanikev@suek.ru,
A.P. Sadov¹, Cand. Sci. (Eng.), Director of the Office of Degassing and Methane Utilization, e-mail: Sadovap@suek.ru,
A.M.-B. Khautiev¹, Cand. Sci. (Eng.), Process Engineer, e-mail: khautievam@suek.ru,
¹ Joint-stock company «SUEK-Kuzbass», Leninsk-Kuznetsky, Russia.

For contacts:

S.V. Slastunov, e-mail: slastunovsv@mail.ru.

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