Self-renewing multi-element cutting structure for rotary...

Details Self-renewing multi-element cutting structure for rotary... Self-renewing multi-element cutting structure for rotary...

E - Fixed Constructions

21

B

255/63

E21B 10/00 (2006.01) E21B 10/56 (2006.01)

Patent

CA 2026498

ABSTRACT OF THE INVENTION 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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