Drill bit assembly

Details Drill bit assembly Drill bit assembly

E - Fixed Constructions

21

B

255/75

E21B 10/26 (2006.01) E21B 10/12 (2006.01) E21B 10/28 (2006.01)

Patent

CA 1283402

ABSTRACT A drill bit assembly comprised of a pilot bit and a plurality of add-on reamer sections which are sized to progressively increase the diameter of the hole in measured increments. Both the pilot bit and the reamer sections have two cutter elements which take advantage of the bi-center concept and both use knife edged cutters instead of teeth to drill the hole.

543052

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