Roller cone bi-center bit

Details Roller cone bi-center bit Roller cone bi-center bit

2005-06-07

2005-06-07

Bagnell, David (Department: 3672)

Boring or penetrating the earth

Cutter element laterally shiftable below ground

Plural selectively shiftable cutter elements

C175S335000, C175S353000, C175S391000

Reexamination Certificate

active

06902014

ABSTRACT:
A roller cone bi-center bit for economically drilling an enlarged borehole below casing in earth formation is provided. The bi-center bit includes a rolling cone cutter or other appropriate cutter to enlarge a pilot bore also made by rolling cone or other type of cutters. The bit comprises a single-diameter body with a recess to accommodate the trailing cutter which enlarges the pilot bore. The bi-center bit may also provide the ability to change out the cutters efficiently in the field. The cutters are oriented to enhance drilling out the cement plug at the bottom of the casing. The cone cutter may be also be mounted on segments which are designed to be easily removed for replacement or adjustment in position in the field.

REFERENCES:
patent: 2330083 (1943-09-01), Sewell
patent: 2754090 (1956-07-01), Kammerer
patent: 4915181 (1990-04-01), Labrosse
patent: 5979574 (1999-11-01), Osadchuk
patent: 6298929 (2001-10-01), Cobos Rojas
patent: 6729418 (2004-05-01), Slaughter et al.
Sketch with cover letter, dated Oct. 6, 1998, showing a “Bi-Center Bit Concept” and disclosed to a prospective customer of the Assignee of the present invention.

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