ROCK DRILLING BIT WITH SLURRY RETRIEVER Russian patent published in 2016 - IPC E21B10/18 

FIELD: mining.

SUBSTANCE: group of inventions relates to drill bits. Drill bit comprises plurality of legs, each defining escape hole, having inlet and outlet, wherein each inlet is configured to receive slurry from drilling bit cavity for slurry movement through escape holes and withdrawal from drilling bit via outlets; plurality of slurry limiters, each of which is attached to corresponding leg at inlet and partially seals escape hole, wherein slurry limiter is configured to provide passage through escape hole of defined size slurry only, wherein slurry limiters are made separately from leg; and plurality of holes for drilling mud, each running from drilling bit inner cavity and crosses corresponding escape hole.

EFFECT: technical result consists in drilling bit service life increase.

28 cl, 4 dwg