Self-renewing multi-element cutting structure for rotary drag bi

Details Self-renewing multi-element cutting structure for rotary drag bi Self-renewing multi-element cutting structure for rotary drag bi

1989-09-29

1991-06-25

Novosad, Stephen J.

Boring or penetrating the earth

Bit or bit element

Magnetized or with magnet

175379, 175410, 51307, E21B 1046

Patent

active

050258737

ABSTRACT:
The present invention comprises a rotary drill bit including a cutting structure comprising an array of cutting elements oriented and arranged to facilitate concentration of the load on bit on groups of cutting elements until the elements become dulled or worn, at which point fresh cutting elements are exposed to engage the formation and tube the concentrated bit loading. Preferably, the cutting elements are configured and/or supported to break away from the cutting structure when worn to a certain extent, thereby facilitating exposure of fresh cutting elements to engage the formation.

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