Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1990-11-21
1992-06-09
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175408, 175425, E21B 1046
Patent
active
051198924
ABSTRACT:
A rotary drill bit comprises a bit body having a shank for connection to a drill string and a passage for supplying drilling fluid to the face of the bit, which carries a plurality of polycrystalline diamond preform cutting elements. The cutting elements on one side of a diameter of the bit have positive side rake and the cutting elements on the other side of the diameter have negative side rake so that the vectorial sum of the reaction forces between the formation being drilled and the cutting elements provides a resultant lateral imbalance force acting on the bit body as it rotates in use. The gauge of the bit body includes low friction bearing pads so located as to transmit the resultant lateral force to the sides of the borehole. Since the bearing pads are of low friction, they slide around the surface of the formation and any tendency for bit whirl to be initiated is reduced. The lateral imbalance force may also be provided by varying the back rake of the cutting elements on different parts of the bit, or by including an asymmetrical mass of material in the bit body.
REFERENCES:
patent: 1587266 (1926-06-01), Zublin
patent: 2074951 (1937-03-01), Zublin
patent: 2931630 (1960-04-01), Grady
patent: 3120285 (1964-02-01), Rowley et al.
patent: 3215215 (1965-11-01), Kellner
patent: 3455402 (1969-07-01), Tiraspolsky
patent: 3851719 (1974-12-01), Thompson et al.
patent: 3908771 (1975-09-01), Garrett
patent: 3923109 (1975-12-01), Williams
patent: 4220213 (1980-09-01), Hamilton
patent: 4463220 (1984-07-01), Gonzalez
patent: 4635738 (1987-01-01), Schillinger et al.
patent: 4982802 (1991-01-01), Warren et al.
patent: 5010789 (1991-04-01), Brett et al.
"Bit Whirl-A New Theory of PDC Bit Failure", paper No. SPE 15971, by J. F. Brett, T. M. Warren and S. M. Behr, Society of Petroleum Engineers, 64th Annual Technical Conference, San Antonio, TX. Oct. 8-11, 1989.
"Development of a Whirl Resistant Bit", paper No. 19572, by T. M. Warren, Society of Petroleum Engineers, 64th Annual Technical Conference, San Antonio, TX, Oct. 8-11, 1989.
Clegg John M.
Hawke Leslie R.
Taylor Malcolm R.
Novosad Stephen J.
Reed Tool Company Limited
LandOfFree
Notary drill bits does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Notary drill bits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Notary drill bits will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1798735