Window mill and drill bit

Details Window mill and drill bit Window mill and drill bit

2007-02-20

2007-02-20

Neuder, William (Department: 3672)

Boring or penetrating the earth

Processes

Boring curved or redirected bores

C166S055100, C166S298000

Reexamination Certificate

active

10916342

ABSTRACT:
A method and apparatus for running a whipstock into a well bore attached to a combination mill and drill bit, releasing the mill/bit from the whipstock, milling a window in the casing, and drilling a lateral well bore, all in one trip. The mill/bit is provided with a primary cutting structure better suited for milling through the casing, and a secondary cutting structure, better suited for drilling through the earth formation. The secondary cutting structure is initially smaller in diameter than the primary cutting structure. The whipstock can be attached to the mill/bit with a shear bolt supported by a boss on the whipstock, with the boss designed to arrest axial motion of the mill/bit after shearing of the bolt.

REFERENCES:
patent: 5887668 (1999-03-01), Haugen et al.
patent: 5979571 (1999-11-01), Scott et al.
patent: 6131675 (2000-10-01), Anderson
patent: 6612383 (2003-09-01), Desai et al.
patent: 2001/0035302 (2001-11-01), Desai et al.
patent: 2001/0040054 (2001-11-01), Haugen et al.

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