METHOD FOR HYDRAULIC TREATMENT OF COAL BED Russian patent published in 2013 - IPC E21F7/00 

FIELD: mining.

SUBSTANCE: method includes fluid supply through the well into the bed via delivery pump, fluid hydro-pulse impact on the bed, reduction of fluid well-head pressure to atmospheric pressure with its following discharge from the well. Together with fluid hydro-pulse impact on the bed there accumulated is the hydraulic energy of the stream, created by delivery pump, in hydraulic accumulator with the following supply of accumulated fluid into the well and with regular repeating of modes of fluid discharging from the well and its delivery into the bed. When fluid is pumped into the bed, well-head pressure is increased as quickly as possible and it is maintained via accumulated fluid supply for the time necessary for bed cracks formation. Then well-head pressure is decreased as quickly as possible to atmospheric pressure and fluid is discharged from the well. The sizes and configuration of cracks formed are defined by value and duration of applied pressure.

EFFECT: increase of coal bed degassing efficiency, reduction of labour costs.