Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent
1991-10-31
1993-02-16
Melius, Terry Lee
Boring or penetrating the earth
Bit or bit element
Nonsymmetrical bit
175431, E21B 1046
Patent
active
051862689
ABSTRACT:
A rotary drill bit comprises a bit body carrying a plurality of primary preform cutting elements defining a primary cutting profile. The bit includes means to apply a lateral imbalance force to the bit as it rotates, and a portion of the outer periphery of the bit body includes a low friction bearing surface so located as to transmit the lateral force to the formation. There are associated with some of the primary cutting elements respective secondary elements spaced inwardly of the cutting profile defined by the primary cutting elements, but the portion of the periphery of the bit body where the bearing surface is located is substantially free of such secondary elements. The arrangement enhances the anti-whirl characteristics of the bit.
REFERENCES:
patent: 4512426 (1985-04-01), Bidegaray
patent: 4718505 (1988-01-01), Fuller
patent: 4823892 (1989-04-01), Fuller
patent: 4862974 (1989-09-01), Warren et al.
patent: 4889017 (1989-12-01), Fuller et al.
patent: 4905776 (1990-03-01), Beynet et al.
patent: 4932484 (1990-06-01), Warren et al.
patent: 5042596 (1991-08-01), Brett et al.
patent: 5099934 (1992-03-01), Barr
"Bit Whirl--A New Theory of PDC Bit Failure", paper No. SPE 19571, 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.
Camco Drilling Group Ltd.
Melius Terry Lee
Tsay Frank S.
LandOfFree
Rotary 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 Rotary drill bits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary drill bits will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2142306