Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1993-04-08
1995-07-11
Bagnell, David J.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
51309, 175432, E21B 1046
Patent
active
054312396
ABSTRACT:
An improved stud design for an earth boring drill bit is disclosed preferably using materials of different hardness and toughness layered to provide maximum resistance to surface abrasion coupled with excellent structural properties including high strength with maximum fracture toughness. The bit body is conventionally attached to a drill string, and has a crown and gage portion. The studs preferably include a core, made of steel or other material having high fracture toughness, covered at least in part with a hard, abrasion resistant material such as tungsten carbide. Each stud is secured to a socket in the bit body by means of brazing or other suitable means such as a press fit. The cutting element is brazed to a mounting face of the stud prior to affixation of the stud to the bit body and is preferably comprised of a polycrystalline diamond compact adhered to a backing layer of tungsten carbide.
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Cooley Craig H.
Horton Ralph M.
Pastusek Paul E.
Smith Redd H.
Tibbitts Gordon A.
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