Abradable cutter protection

Details Abradable cutter protection Abradable cutter protection

E - Fixed Constructions

21

B

255/87

E21B 12/04 (2006.01) E21B 10/00 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1174665

ABRADABLE CUTTER PROTECTION Abstract of the Disclosure A rotary drill bit for drilling earth formations is disclosed having a plurality of cutting elements mounted on the head portion of the bit. The bit further includes a plurality of individual protrusions projecting from the head portion more than the extension of the cutting elements. The protrusions are fabricated of a metal more readily abraded by the earth formation than any of the cutting elements. The protrusions protect the cutting elements during handling of the bit and entry of the bit into a borehole; and, the protectors are abraded away to expose the cutting elements during drilling.

402272

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