Drill bit with integrally forged stabilizer

Details Drill bit with integrally forged stabilizer Drill bit with integrally forged stabilizer

E - Fixed Constructions

21

B

255/68

E21B 10/00 (2006.01) E21B 10/08 (2006.01) E21B 10/18 (2006.01) E21B 10/52 (2006.01) E21B 17/10 (2006.01)

Patent

CA 1335988

The invention discloses a drill bit that is assembled from a plurality of machined forgings that are welded together to form a unitary structure. Each forging comprises an upper body portion and a lower leg portion. The lower leg portion is machined to form a shirttail section and a journal section, which in turn is adapted to rotatively support a cone shaped cutter. In operation, the cutter is oriented to describe a circular path, the outer diameter of which forms the gage diameter of the bit. The upper body portion is machined to include a stabilizer lug extending radially outward to substantially the same diameter as that formed by the cutters. The lower section of the lug cooperates with a recessed portion of the leg to form a flow passage for enabling drilling fluid to more easily pass upward through the borehole annulus during operation. A plurality of polycrystalline diamond inserts are mounted within the surface of each stabilizer lug.

562120

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