Drill bit having chip breaker polycrystalline diamond compact an

Details Drill bit having chip breaker polycrystalline diamond compact an Drill bit having chip breaker polycrystalline diamond compact an

1994-09-26

1995-09-12

Dang, Hoang C.

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

E21B 1046

Patent

active

054490480

ABSTRACT:
A drag bit having a plurality of blades or ribs on its end face has one or more pockets milled into the top surfaces of said blades using a ball-nosed end mill to create a plurality of pockets, each having a spherical or a semi-spherical first end and a second end having a semicircular configuration that intersects with the leading edge face of the rib. A bullet-shaped cutting structure having a spherical first end is brazed into each of the pockets. During the manufacturing process, a pin is brazed into cooperating first and second semicircular receptacles in the spherical end of the cutter and in the semi-spherical end of the pocket, respectively, to prevent the cutter assembly from being pushed up out of the pocket during the drilling operation. In an alternative embodiment, a slot is milled into the top surface of the rib to allow use of a ball-nosed end mill having a reduced diameter shank sized to pass through the slot. In yet another embodiment, a tungsten carbide button or insert is position at the gauge diameter to reduce impact on the gauge diameter cutter in each of the ribs. Cutter assemblies are disclosed having a variety of orifices in the PDC cutter face to function as chip breakers during the drilling operation.

REFERENCES:
patent: Re32036 (1985-11-01), Dennis
patent: 4606418 (1986-08-01), Thompson
patent: 4640375 (1987-02-01), Barr et al.
patent: 4852671 (1989-08-01), Southland
patent: 4872520 (1989-10-01), Nelson
patent: 4984642 (1991-01-01), Renard et al.
patent: 4997049 (1991-03-01), Tank et al.
patent: 5078219 (1992-01-01), Morrell et al.

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