Rock bit borhole back reaming method

Details Rock bit borhole back reaming method Rock bit borhole back reaming method

1994-01-24

1995-05-16

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Rolling cutter bit or rolling cutter bit element

761082, 175401, 175408, E21B 1016, E21B 1052

Patent

active

054152437

ABSTRACT:
A method to back ream a borehole drilled with a roller cone drill bit is taught. Protruding hard metal cutting inserts are affixed on the upper outside diameter tapered shoulder of each of the bit legs. If the borehole closes to a smaller diameter than the bit gage diameter or loose rock rubble packs around the upper portion of the bit, the protruding cutting inserts fixed on the upper leg tapered shoulder portion back ream the borehole by lifting and rotating the bit.

REFERENCES:
patent: 1637594 (1927-08-01), Stewart
patent: 1816568 (1931-07-01), Carlson
patent: 3389761 (1968-06-01), Ott
patent: 4140189 (1979-02-01), Garner
patent: 4512425 (1985-04-01), Brock
patent: 4811801 (1989-03-01), Salesky et al.

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