Drill bit with shrouded cutter

Details Drill bit with shrouded cutter Drill bit with shrouded cutter

1984-05-25

1986-12-30

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175410, E21B 1012

Patent

active

046321969

ABSTRACT:
A drill bit for connection on a drill string has a hollow tubular body with an end cutting face and an exterior peripheral stabilizer surface with cylindrical sintered carbide inserts positioned in recesses therein having polycrystalline diamond cutting elements mounted on said inserts. The inserts each also have a metal reinforcing shroud secured on the supporting face providing a reinforcement for the polycrystalline diamond cutting elements which is not subject to notch fracture. Each shroud is arranged so that a wall of the associated recess reinforces the shroud against shear forces and reinforces the stud against fracture.

REFERENCES:
patent: 4073354 (1978-02-01), Rowley et al.
patent: 4098363 (1978-04-01), Rohde et al.
patent: 4156329 (1979-05-01), Daniels et al.
patent: 4323130 (1982-04-01), Dennis
patent: 4381825 (1983-05-01), Radtke
patent: 4396077 (1983-08-01), Radtke
patent: 4442909 (1984-04-01), Radtke
patent: 4498549 (1985-02-01), Jurgens
Chapter entitled Stratapax Bits, pp. 541-591 published in Advanced Drilling Techniques by Sm. C. Maurer, The Petroleum Publishing Company, Oklahoma, publ. 1980.

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