This drilling bit includes a bit body centered on a tool central axis, a plurality of buttons protruding from a tip surface of the bit body, a discharge flow path disposed from the tip surface of the bit body over an outer peripheral surface, and a blow hole that extends inside the bit body and is open at the tip surface. The discharge flow path has a first flow path which has a groove shape located on the tip surface and extending in a tool radial direction, and at which the blow hole is open, and a second flow path located outward in the tool radial direction from the blow hole on the tip surface to communicate with the first flow path, and extending in a tool circumferential direction.

This drilling bit includes a bit body centered on a tool central axis, a plurality of buttons protruding from a tip surface of the bit body, a discharge flow path disposed from the tip surface of the bit body over an outer peripheral surface, and a blow hole that extends inside the bit body and is open at the tip surface. The discharge flow path has a first flow path which has a groove shape located on the tip surface and extending in a tool radial direction, and at which the blow hole is open, and a second flow path located outward in the tool radial direction from the blow hole on the tip surface to communicate with the first flow path, and extending in a tool circumferential direction.

A composite tungsten carbide insert (B, I) with heterogeneous composition and structure has a working part (W) and a non-working part (N). The working part (W) is made of a tungsten carbide material consisting of tungsten carbide powder and cobalt powder or nickel. The non-working part (N) is made of a low density tungsten carbide material consisting of titanium carbide powder, tungsten carbide powder, and cobalt powder or nickel powder. During pressing, the tungsten carbide material for the working part (W) and the low density tungsten carbide material for the non-working part (N) are weighed and added to a steel die successively for molding and then sintering. The non-working part (N) which accounts for most of the overall product volume has low density and less material consumption, and can greatly reduce the raw material costs of the product, significantly improving the performance-cost ratio of the insert (B, I).

Cutter assemblies include an outer support and a cutting element disposed therein. The cutting element is immovably attached to the outer support element. Also disclosed is downhole tools incorporating such cutter assemblies and methods of making such downhole tools.

Cutter assemblies include an outer support and a cutting element disposed therein. The cutting element is immovably attached to the outer support element. Also disclosed is downhole tools incorporating such cutter assemblies and methods of making such downhole tools.

An earth boring bit has rotary cutters with embedded tungsten carbide inserts and milled steel teeth. The teeth and the grooves are first milled into the cutters, with the grooves extending between bases of the teeth, parallel to the crests of the teeth. Hard facing is applied to surfaces of the teeth and the grooves, and then the cutters are heat treated. Insert sockets are drilled into the teeth, centrally disposed in crests of the teeth. The tungsten carbide inserts are secured in the insert sockets, aligned for forming cutting profiles with respective ones of the milled teeth. The cutters are preferably frustoconically shaped and used for a rotary cone rock bit, and the tungsten carbide inserts configured as chisel-shaped inserts having crests which are aligned parallel to the crests of the milled steel teeth.

An earth boring bit has rotary cutters with embedded tungsten carbide inserts and milled steel teeth. The teeth and the grooves are first milled into the cutters, with the grooves extending between bases of the teeth, parallel to the crests of the teeth. Hard facing is applied to surfaces of the teeth and the grooves, and then the cutters are heat treated. Insert sockets are drilled into the teeth, centrally disposed in crests of the teeth. The tungsten carbide inserts are secured in the insert sockets, aligned for forming cutting profiles with respective ones of the milled teeth. The cutters are preferably frustoconically shaped and used for a rotary cone rock bit, and the tungsten carbide inserts configured as chisel-shaped inserts having crests which are aligned parallel to the crests of the milled steel teeth.

A hybrid drill bit includes a bit body having a central bit body axis, a roller cone at an end of the bit body and rotatably coupled to the bit body about a roller cone axis, and a disc at the end of the bit body and rotatably coupled to the bit body about a disc axis. The roller cone axis extends toward the central bit body axis. The disc axis is transverse to a radial of the central bit body axis through a center of the disc, and the disc includes a plurality of disc cutters.

Cutters for a drill bit wherein the cutters have at least one groove in a face of a superabrasive table of the cutters. The cutters may also include ribs adjacent to the at least one groove.

Cutters for a drill bit wherein the cutters have at least one groove in a face of a superabrasive table of the cutters. The cutters may also include ribs adjacent to the at least one groove.