Rotary drill bits

Details Rotary drill bits Rotary drill bits

1984-10-26

1986-06-24

Levy, Stuart S.

Boring or penetrating the earth

Bit or bit element

Cutting edge self-renewable during operation

15180, 175340, E21B 1058, E21B 1010, A46B 1303

Patent

active

045962960

ABSTRACT:
A rotary drill bit, for use in subsurface formations, comprises a bit body, a passageway for drilling fluid within the body, communicating with nozzles in the external surface of the body, preform cutting elements mounted on the body for cutting or abrading the formation, and a number of elongate fences upstanding from the external surface of the body to control the flow of fluid from the nozzles and past cutting elements. Each fence is resiliently deformable, for example being in the form of a brush having metal bristles, so that, in use, the free elongate edge of the fence is urged resiliently into contact with the surface of the formation being cut or abraded by the cutting elements. Since each fence is resiliently deformable it will at all times firmly engage the formation to provide an effective seal, regardless of variations in depth of cut of the cutting elements.

REFERENCES:
patent: 2539054 (1951-01-01), Breuer et al.
patent: 2619666 (1952-12-01), Hayes et al.
patent: 3243832 (1966-04-01), Allen et al.
patent: 3384191 (1968-05-01), Schumacher, Jr. et al.
patent: 4200160 (1980-04-01), Newcomb
patent: 4341273 (1982-07-01), Walker et al.
patent: 4363367 (1982-12-01), Dixon et al.
patent: 4397363 (1983-08-01), Fuller
patent: 4465148 (1984-08-01), Morris et al.

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