Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1992-01-06
1993-08-24
Britts, Ramon S.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
E21B 1046
Patent
active
052380742
ABSTRACT:
A cutter for a rotating drag bit which has a cutting face formed from a plurality of polycrystalline diamond compact (PCD) elements. The elements can be of varying thickness and/or varying hardness to provide a cutting edge having a nonuniform wear pattern. Also provided is a cutter which includes two layers of PCD elements. The PCD elements can be of varying thickness and/or hardness to provide a cutter which presents a cutting edge having a wear ratio which varies with cutter wear. Also provided is an impact cutter having a cutting surface formed from one or more layers of PCD elements.
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Color photograph showing a "bear claw" cutter.
Eastman Christensen Company Bit Style Book 1988.
Johns Kenneth
Tibbitts Gordon A.
Baker Hughes Incorporated
Britts Ramon S.
Tsay Frank S.
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