Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Patent
1991-11-14
1992-12-22
Friedman, Carl D.
Boring or penetrating the earth
Bit or bit element
Impact or percussion type
175431, E21B 1036
Patent
active
051727781
ABSTRACT:
A drag-type drill bit for boring an earth formation having a plurality of cutting elements formed thereon. Each cutting element includes a cutting surface having a cutting edge formed thereon. During boring, the cutting edge is embedded into an earth formation so that the formation is received against a portion of the cutting surface. As the cutting surface advances against the formation, a chip forms. The chip has a first surface directed generally toward the cutting surface and a second surface directed generally in the direction of cutting element travel. A number of different embodiments are disclosed which include means formed on and in the cutting surface for communicating drilling fluid pressure via slots or discontinuities to a location on the cutting surface relatively close to the cutting edge. Drilling fluid pressure across the chip is thus equalized thereby preventing the chip from being urged against the cutting surface due to the difference between the formation pressure and the drilling fluid pressure.
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Pastusek Paul
Tibbitts Gordon A.
Baker-Hughes, Inc.
Friedman Carl D.
Schoeppel Roger J.
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