Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1998-03-25
2000-05-23
Lillis, Eileen Dunn
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
175428, 175431, E21B 1036
Patent
active
060655534
ABSTRACT:
A drag-type drill bit for drilling holes in subsurface formations comprises a bit body having an end face and a shank for connection to a drill string, a number of blades upstanding from the end face of the bit body and extending outwardly away from the central axis of rotation of the bit, a number of cutters mounted on each blade, and a number of nozzles in the bit body for delivering drilling fluid for cooling and cleaning the cutters. The blades include primary blades which, at their outer ends, are spaced apart around aperipheral gauge portion of the bit, and secondary blades which are spaced circumferentially between adjacent primary blades, each secondary blade having an outer end which terminates at a location inwardly of the gauge portion of the bit. Each primary blade and associated secondary blade may be equivalent, in terms of their combined contribution to the cutting profile, to a single blade which extends continuously from the centre of the bit body to the gauge, but the separation of the blades facilitates the flow of drilling fluid over and between the blades. Also, the increased number of blades may enhance the stability of the drill bit and reduce vibration.
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Camco International (UK) Limited
Daly Jeffery E.
Lee Jong-Suk
Lillis Eileen Dunn
LandOfFree
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