Rotary drill bits employing tandem gage pad arrangement

Details Rotary drill bits employing tandem gage pad arrangement Rotary drill bits employing tandem gage pad arrangement

1997-09-08

2000-09-05

Lillis, Eileen Dunn

Boring or penetrating the earth

Bit or bit element

With bit guide or bore wall compacting device

175393, 175406, E21B 1710

Patent

active

061128368

ABSTRACT:
A rotary drag bit being suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or rotationally spaced, or both, defining a gap or discontinuity between the primary and secondary gage pads through which drilling fluid from adjacent junk slots may communicate laterally or circumferentially. Longitudinally leading edges of the secondary gage pads may carry cutters for smoothing the sidewall of the borehole. The tandem primary and secondary gage pads provide enhanced bit stability and reduced side cutting tendencies. The discontinuities between the primary and secondary gage pads enhance fluid flow from the bit face to the borehole annulus above the bit, promoting formation cuttings removal. The tandem gage arrangement also has utility in conventional bits not designed specifically for directional drilling.

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