DRILLING BIT OF WELLS IN HIGH-GAS-BEARING FORMATIONS Russian patent published in 2011 - IPC E21B10/00 

FIELD: mining.

SUBSTANCE: drilling bit includes housing with cleaning channels and groove for arrangement of bellows with liquid and valve on upper face overlapping the cleaning channel of adapter rigidly connected to housing and provided with radial channels interconnected with cleaning channels of the housing. Between bottom of groove in the housing and bellows there arranged is the shell made from material with high heat conductivity factor, for example copper; at that, internal and external surfaces of the shell have projections and/or hollows, and surfaces of housing and bellows with mating hollows and/or projections, which contact them. At that, bit is provided with carbide blades the end faces of which are located parallel to the shell bottom with possibility of contacting it or in close proximity to it.

EFFECT: higher safety of executed works and larger application area of the bit.

2 cl, 2 dwg