Improvement of pre-drainage technology based on hydraulic dissection of coal beds

The article describes implementation of integrated hydraulic fracturing in Boldyrev coal bed in extraction panels assigned for development in the nearest future and now subjected to pre-drainage before basic drainage period of not longer than 1–2 years in Kirov Mine. Boreholes drilled from ground surface are mostly used to stimulate coal bed permeability and to create conditions for enhanced methane recovery using the in-situ drainage boreholes which operate effectively under conditions of stimulated gas permeability of coal beds. We studied recoverability of water from coal bed after hydraulic fracturing by means of water discharge to nearby roadways. At the early research stage, in Kirov Mine field, we tested the pre-drainage technology for the first time in Kuzbass, determined its working capacity and estimated potential efficiency. The main processes of preparation and implementation of coal bed pre-treatment by the proposed pre-mining drainage technology using boreholes drilled from ground surface are described. Efficiency of the integrated coal bed drainage technology implemented during longwall mining is evaluated by the factors of absolute and relative gas contents in face areas, longwall downtimes due to critical gas criterion and by coal production rate.

Slastunov S. V., Kolikov K. S., Meshkov A. A., Sadov A. P., Khautiev A. M.-B. Improvement of pre-drainage technology based on hydraulic dissection of coal beds. MIAB. Mining Inf. Anal. Bull. 2021;(6):34-45. [In Russ]. DOI: 10.25018/0236_1493_2021_6_0_34.

S.V. Slastunov¹, Dr. Sci. (Eng.), Professor, e-mail: slastunovsv@mail.ru,
K.S. Kolikov¹, Dr. Sci. (Eng.), Head of Chair, e-mail: kolikovks@mail.ru,
A.A. Meshkov², Cand. Sci. (Eng.), General Director,
A.P. Sadov², Cand. Sci. (Eng.), Director of Department of Methane Degassing and Utilization, e-mail: Sadovap@suek.ru,
A.M.-B. Khautiev², Cand. Sci. (Eng.), Engineer-Technologist, Department of Methane Degassing and Utilization, e-mail: khautievam@suek.ru,
¹ Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.
² SUEK-Kuzbass JSC, Leninsk-Kuznetsky, Russia.

K.S. Kolikov, e-mail: kolikovks@mail.ru.

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