Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1992-12-23
1994-08-02
Dang, Hoang C.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175432, E21B 1046
Patent
active
053336992
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 semi-circular configuration which 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 semi-circular 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: 4200159 (1980-04-01), Peschel et al.
patent: 4593777 (1986-06-01), Barr
patent: 4660659 (1987-04-01), Short, Jr. et al.
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patent: 4989578 (1991-02-01), Lebourg
patent: 5172778 (1992-12-01), Tibbitta et al.
MEGADIAMOND's advertisement, 4 pages, Oct. 1981.
Sherwood William H.
Thigpen Gary M.
Baroid Technology Inc.
Dang Hoang C.
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