Underreamer and method of use

Details Underreamer and method of use Underreamer and method of use

2005-11-01

2010-02-23

Gay, Jennifer H (Department: 3672)

Boring or penetrating the earth

Bit or bit element

Noncutting portion forwardly of cutting portion

C175S297000, C175S269000, C175S286000

Reexamination Certificate

active

07665550

ABSTRACT:
The present invention discloses a collapsible drilling assembly having field-replaceable cutter or stabilizer blades (214) and method of using and installing new stabilizer blades while at a job location. The drilling assembly is deployed upon a distal end of a drillstring, expanded to a gauge size, and used as an underreamer or alternatively a stabilizer. The drilling assembly operates between retracted and extended positions through the increase in pressure of drilling fluid flowing therethrough.

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patent: 5060738 (1991-10-01), Pittard et al.
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patent: 2003/0079913 (2003-05-01), Eppink et al.
patent: 2005/0241856 (2005-11-01), Lassoie et al.
patent: 2005/0241858 (2005-11-01), Eppink et al.
patent: 2006/0144623 (2006-07-01), Ollerensaw et al.
patent: 2007/0163808 (2007-07-01), Campbell et al.

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