Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1990-10-30
1992-04-14
Neuder, William P.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175421, E21B 1042
Patent
active
051039222
ABSTRACT:
A fishtail type drag bit is disclosed consisting of multiple blades, each blade forming radially disposed grooves. Each groove contains equidistantly spaced diamond cutters along its length. The cutters are additionally oriented at a negative rake angle with respect to a borehole bottom. The vertical alignment of the diamond cutters paralleling an axis of the bit are staggered to destroy kerfs which remain in the formation from preceding eroded rows of diamond cutters as the bit works in the borehole.
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Neuder William P.
Smith International Inc.
Upton Robert G.
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