Boring or penetrating the earth – Bit or bit element – With bit guide or bore wall compacting device
Patent
1997-09-08
1999-10-19
Neuder, William
Boring or penetrating the earth
Bit or bit element
With bit guide or bore wall compacting device
175415, 175406, E21B 1050
Patent
active
059672471
ABSTRACT:
A rotary drag bit including a gage design which facilitates steerability while preventing lateral displacement of the bit and attendant ledging of the borehole wall, and reams and conditions the borehole wall as the bit advances through the formation. The bit includes an elongated gage section comprised of a plurality of circumferentially spaced gage pads, each including mutually longitudinally displaced gage pad segments of varying lateral aggressiveness, or tendency to cut formation material under application of load. A leading gage pad segment extending from and closest to the bit face is somewhat aggressive, being provided with conventional PDC cutting elements, while an intermediate gage pad segment is devoid of cutters and may be characterized as a "slick" gage segment, acting as a bearing surface and limiting lateral displacement of the bit under pure side loads, and a trailing, tapered gage pad segment is somewhat aggressive, being provided with cutting elements to ream and condition the borehole wall.
REFERENCES:
patent: 4429755 (1984-02-01), Williamson
patent: 4499958 (1985-02-01), Radtke et al.
patent: 4515226 (1985-05-01), Mengel et al.
patent: 4545441 (1985-10-01), Williamson
patent: 5004057 (1991-04-01), Tibbitts et al.
patent: 5163524 (1992-11-01), Newton, Jr. et al.
Baker Hughes Incorporated
Neuder William
Walker Zakiya
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