Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
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.
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Fielder Coy M.
Sherwood, Jr. William H.
Thigpen Gary M.
Baroid Technology Inc.
Dang Hoang C.
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