DRILL BIT WITH CASING PIPE OR CASING-SHANK AND ITS MANUFACTURING Russian patent published in 2020 - IPC E21B10/42 E21B7/20 E21B17/46 

FIELD: soil or rock drilling.

SUBSTANCE: group of inventions relates to drilling bit with casing pipe or casing-shank and methods of well drilling using said bits. Drill bit with casing pipe or casing-shank comprises: tubular rod made of high-strength metal or alloy; a head having a cutting end with an inner cone, an outer arm and an intermediate nose between the cone and the arm, attached to the end of the rod, as well as made of nonferrous metal or alloy; a plurality of blades formed integrally with the head, made from nonferrous metal or alloy and each extending from the center of the cutting end face to the shoulder; plurality of superhard cutters arranged along each blade; a plurality of calibrated bosses formed integrally with the rod; as well as a flush joint formed between each blade and a corresponding calibrated boss. Resistance to deformation of high-strength metal or alloy is equal to at least double value of resistance to deformation of nonferrous metal or alloy. Additionally, the bit comprises an articulation joint and an overlap joint attaching the head to the stock, as well as the lap joint has a lap joint assembly located on the rod coupled to the lap joint assembly located on the head.

EFFECT: technical result is higher efficiency of drill bit operation.

20 cl, 9 dwg