DEGASATION METHOD OF DEVELOPED COAL BEDS Russian patent published in 2011 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method includes degassing holes drilling, pressurisation of their collars, dynamic influence on coal bed, connection of degassing holes to degasation system pipeline and gas drainage from coal bed. Degassing holes are drilled from working face by separate areas 0.26 m in diametre. Simultaneously with degassing holes drilling at the next degassing area there additionally drilled are intermediate holes between and parallel to them the diametre of which is two times less. There performed is dynamic effect at the bed in the specified degassing area between degassing holes through intermediate holes by means of water-sand emulsion pumping at first in static mode at 1.0 MPa, and then in dynamic mode at pressure 1.2-2.0 MPa. There performed is gas edging from free surface of opened cracks and its drainage towards decompression zones. Degassing holes are divided into two groups with their orientation in relation to each other in alternating order. In order to extrude the remaining gas volume from coal bed cracks, switching connection order of both degassing holes groups to reverse, there continued is coal bed aeration and drainage of gas edged by air from bed cracks. The cycle of described works on coal bed degassing is repeated at the next degassing area.

EFFECT: exclusion of gas-dynamic occurrences at coal bed development.

5 dwg