Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent
1997-04-16
2000-07-18
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
With fluid conduit lining or element
175399, E21B 1060
Patent
active
060893362
ABSTRACT:
A rotary drill bit for use in drilling holes in subsurface formations comprises a bit body having a leading face and a gauge region, a number of blades formed on the leading face of the bit and extending outwardly away from the axis of the bit so as to define between the blades a number of fluid channels leading towards the gauge region, a number of cutting elements mounted side-by-side along each blade, and a number of nozzles in the bit body for supplying drilling fluid to the fluid channels for cleaning and cooling the cutting elements. In each of the fluid channels, adjacent the gauge region, is an opening into an enclosed passage which passes internally through the bit body to an outlet which, in use, communicates with the annulus between the drill string and the wall of the borehole being drilled. The gauge region of the drill bit comprises a substantially continuous bearing surface which extends around the whole of the gauge region.
REFERENCES:
patent: 5145017 (1992-09-01), Holster et al.
patent: 5794725 (1998-08-01), Trujillo et al.
Clegg John M.
Murdock Andrew
Nexton Alex
Taylor Steven
Tomczak Michael
Camco International (UK) Limited
Daly Jeffery E.
Tsay Frank
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