Rotary drag bits having a pilot cutter configuraton and...

Details Rotary drag bits having a pilot cutter configuraton and... Rotary drag bits having a pilot cutter configuraton and...

2011-03-01

2011-03-01

Bomar, Shane (Department: 3676)

Boring or penetrating the earth

Processes

C175S391000, C175S431000

Reexamination Certificate

active

07896106

ABSTRACT:
A rotary drag bit exhibiting enhanced cutting efficiency and extended life is provided. The rotary drag bit comprises a bit body having a face surface, and a plurality of cutters coupled to the face surface of the bit body. The plurality of cutters comprises at least one pilot cutter and a rotationally trailing larger, primary cutter at substantially the same radius and, optionally of slightly less exposure. The pilot cutter is sized and positioned to pre-fracture the formation and perform an initial cut, while the primary cutter removes weakened, remaining formation material along the same rotational path. A method to pre-fracture subterranean formations using a rotary drag bit having a pilot cutter configuration is also provided.

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