Selectively retrievable wear bushing for subsea or surface...

Details Selectively retrievable wear bushing for subsea or surface... Selectively retrievable wear bushing for subsea or surface...

2007-10-23

2007-10-23

Bagnell, David (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S085300

Reexamination Certificate

active

10946781

ABSTRACT:
The present invention is directed to an assembly for installing and selectively retrieving a wear bushing in the bore of a subsea or surface wellhead. The assembly includes a bit sub, which is adapted for attachment to a drill string, a drill string adapter removably coupled to the bit sub, and a wear bushing removably coupled to the drill string adapter and adapted to be recoupled to the drill string adapter for selective retrieval from the bore of the wellhead.

REFERENCES:
patent: 3247914 (1966-04-01), Slack
patent: 5199495 (1993-04-01), Brammer et al.
patent: 5762136 (1998-06-01), Oswald
patent: 6749018 (2004-06-01), Ford et al.
patent: 2002/0092656 (2002-07-01), Ford et al.

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