METHOD FOR EXTRACTING METHANE FROM COAL BED Russian patent published in 2005 - IPC

FIELD: mining industry.

SUBSTANCE: method includes drilling directed wells from surface, extracting free methane, forcing substance into bed with absorption capacity greater than those of methane, with following extraction of methane from it. Closed circulation system is previously formed, formed by forcing and extracting wells for directed drilling with horizontal shafts perforated along whole length, filtering channels, formed by directional radial hydraulic fracturing of bed. Horizontal shaft of forcing well is positioned above horizontal shaft of extracting well. Then broad fraction of light hydrocarbons is fed into coal bed, extraction of which with absorbed methane is realized via extraction bed. Then along surface pipeline of extraction well substance is fed, saturated with methane, to separation station for separation of methane from broad fraction of light hydrocarbons. After separation gas is sent to consumer, and broad fraction of light hydrocarbons is sent through forcing well into coal bed. As absorbent, solar distillate or kerosene are used.

EFFECT: lower costs, simplified operation, higher personnel safety.

3 cl, 1 dwg