Well drilling tool

Details Well drilling tool Well drilling tool

1979-05-18

1981-03-17

Pate, III, William F.

Boring or penetrating the earth

With signaling, indicating, testing or measuring

175107, 175228, E21B 402

Patent

active

042561892

ABSTRACT:
A well drilling tool is disclosed as having an inner tubular member rotatably supported from an outer tubular member by means of bearings contained within an annular lubricant chamber between them. An annular chamber is formed in an inner tubular member to provide a reservoir for supplying additional lubricant to the chamber to replace that which is lost during use of the tool. An annular piston is sealably slidable within the reservoir, and drilling fluid, which is circulated through a passageway through the tool, is admitted to one end of the reservoir by a port in the inner member to urge the piston toward the other end of the reservoir which connects with the lubricant chamber.

REFERENCES:
patent: 3807513 (1974-04-01), Kern
patent: 3971450 (1976-07-01), Fox
patent: 4019592 (1977-04-01), Fox
patent: 4080115 (1978-03-01), Sims et al.
patent: 4114702 (1978-09-01), Maurer et al.

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