Rotary drag bit with multiple backup cutters

Details Rotary drag bit with multiple backup cutters Rotary drag bit with multiple backup cutters

2011-01-04

2011-01-04

Bagnell, David J (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Specific or diverse material

Reexamination Certificate

active

07861809

ABSTRACT:
A rotary drag bit includes a primary cutter row comprising at least one primary cutter and a multiple backup cutter group. The multiple backup cutter group comprises a first and second trailing cutter row, each comprising at least one cutter positioned to follow the at least one primary cutter. The rotary drag bit life is extended by the multiple backup cutter groups making the bit more durable and extending the life of the cutters. Further, the cutters of the multiple backup cutter group are configured to selectively engage a subterranean formation material being drilled, providing improved bit life and reduced stress upon the cutters. Other embodiments of rotary drag bits are provided.

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