CORE DRILLING BIT Russian patent published in 2011 - IPC E21B10/48 E21B10/60 

FIELD: mining.

SUBSTANCE: core drilling bit including housing with connection thread is divided with flushing ports into sectors which are equipped on end surface with cutters with hard-alloy plates. Flushing ports are located opposite at an angle in the sectors with well-forming cutting elements, i.e. forming the side surface of the well. Cutting elements are provided on the end surface with negative front angles to the surface of the bottom hole. Flushing ports located opposite at an angle increase removal intensity of well cuttings from the bottom hole, owing to which drilling speed increases.

EFFECT: self-sharpening of cutting elements and improvement of operating reliability and service life of drilling bit.

2 dwg