DRILLING BIT Russian patent published in 2012 - IPC E21B10/02 E21B10/48 

FIELD: mining.

SUBSTANCE: drilling bit includes bit blank with slots on the end, in each of them there installed is a group of carbide-cutting tools including main cutting tools, well-forming and core-forming cutting tools. Cutting tools of each group are bow-shaped in vertical and horizontal planes. Cutting tools of one group are faced with their convex surface to well axis and cutting tools of the other group - to well walls, at that main cutting tools of one group are installed covering gaps between main cutting tools of neighbouring group.

EFFECT: improving drilling bit operating efficiency.

2 cl, 2 dwg