Self sharpening drag bit for sub-surface formation drilling

Details Self sharpening drag bit for sub-surface formation drilling Self sharpening drag bit for sub-surface formation drilling

E - Fixed Constructions

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B

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E21B 10/46 (2006.01) E21B 10/00 (2006.01) E21B 10/48 (2006.01) E21B 10/56 (2006.01)

Patent

CA 1238308

SELF SHARPENING DRAG BIT FOR SUB-SURFACE FORMATION DRILLING ABSTRACT OF THE DISCLOSURE A self-sharpening rotary drag bit assembly comprises: a) a carrier body adapted to be rotated about a first . axis, and having a drilling end, b) cutters carried by the body to be exposed for cutting at the drilling end of the body the cutters having thereon layers of hard materials defining cutting edges to engage and cut the drilled formation as the body rotates, the cutters also including reinforcement material supporting said layers to resist deflection thereof under cutting loads, c) said body and said reinforcement material being characterized as abradable by the formation as the bit drilling end rotates in engagement with the formation. -1-

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