METHOD FOR EXTRACTING METHANE ON FIELDS OF ABANDONED COAL MINES Russian patent published in 2010 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: invention involves determination, according to mining-and-geological and mining-and-technical conditions of the mine, of technogenic methane reservoirs formed with disintegration of rocks during extraction of coal beds. There chosen are location places of wells on the basis of extracting maximum amount of methane from one or several technogenic reservoirs through each well at its depth providing optimum unit costs for methane extraction from those reservoirs. Invention allows increasing methane content in the extracted gas mixture owing to limited air inflow to the well due to high aerodynamic resistance of the deformed massif in the section of unextinguished mine workings to well perforation channels. Invention allows extracting conditioned methane-air mixtures in conditions of occasional disturbance of tightness of mine workings with atmosphere or absence of tightness in widely used mine abandonment technologies.

EFFECT: increasing productivity of degassing wells owing to degassing of several technogenic reservoirs opened with one well.

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