DIAMOND DRILL BIT FOR DRILLING OF FLUSHING FLUID LOSS ZONE Russian patent published in 2016 - IPC E21B10/43 E21B10/55 E21B10/567 E21B10/60 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to a rock destruction tool used for drilling oil and gas wells. Diamond drill bit for drilling of flushing fluid loss zone comprises a cylindrical body with a thread for connection to drill string, blades with diamond cutters for rock destruction, internal cavities and channels for supply of flushing fluid, hard-alloy nozzles installed at output of said channels. Cutters for destruction of rock used are heat-resistant diamond cutters of double pressing with minimum amount of cobalt in upper layer, mounted on blades with negative cutting angle within range of 15-20°, and channels for supply of flushing liquid and hard-alloy nozzles have drift diameter not less than 16 mm.

EFFECT: technical result is enabling use of diamond bits during drilling of flushing fluid loss zones.

1 cl, 3 dwg