Drill bit lubrication apparatus and method

Details Drill bit lubrication apparatus and method Drill bit lubrication apparatus and method

2007-07-10

2007-07-10

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

C175S228000, C175S348000, C175S349000, C175S370000

Reexamination Certificate

active

11279565

ABSTRACT:
A lubricating nutating single cone drill bit10is disclosed. Bit10includes a bit shank12with an axially skewed bore18rotatably retaining a cutter body22. A plurality of cutter elements (46, 48) are affixed to the cutter body22. Bearings (26, 28, 30, 32) enable rotation of the cutter body22and lubricant is dispensed to the bearings from a lubricant chamber (76, 76′) by a plunger80driven by drilling fluid. A method to drill includes attaching the bit10to a drill string, engaging the bit10into a formation (WB), pumping a drilling fluid into a plunger80in the lubricant chamber76to dispense lubricant to the bearings (26, 28, 30, 32). The method can include pumping the drilling fluid through a fluid passage90in the bit10and out of a low pressure orifice94on the cutter body22.

REFERENCES:
patent: 4096917 (1978-06-01), Harris
patent: 4168755 (1979-09-01), Willis
patent: 4254838 (1981-03-01), Barnetche
patent: 5195754 (1993-03-01), Dietle
patent: 6227547 (2001-05-01), Dietle et al.
patent: 6892828 (2005-05-01), Rives

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