METHOD OF DEGASSING WITH CENTERING OF DRILLING ROD, THAT OF DRILLING ROCKS AND DEVICE TO THIS END Russian patent published in 2011 - IPC E21F7/00 E21C37/00 

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used in drilling blast-holes, wells, degassing of rocks and their disintegration using disintegrating agents. Proposed method comprises drilling blast-holes, wells, their stepwise degassing in drilling, zone-by-zone drilling of rocks and degassing. In drilling, stepwise degassing is carried out along with centring of drilling rod. Note that drilling is suspended solely in registered gas accumulation areas to reduce gas recovery of rock stratum to natural rate of gas release. Proposed device comprises also drilling rod with inner and outer drilling strings that form a channel there between. Outer tube accommodates spacer seal fitted thereon. Device can incorporate several separate drilling bars with seals for stepwise degassing and disintegration of rocks.

EFFECT: higher safety and reliability in drilling, extracting gas and preparing stratum for extraction.

4 cl, 6 dwg