Wells – Processes – Freeing stuck object – grappling or fishing in well
Reexamination Certificate
2005-02-01
2005-02-01
Bagnell, David (Department: 3672)
Wells
Processes
Freeing stuck object, grappling or fishing in well
C166S098000, C294S086400, C294S086120
Reexamination Certificate
active
06848506
ABSTRACT:
A rotating inner member is used to drive operation of a retrieval tool connected to a dual-member drill string. The retrieval tool preferably has a gripping assembly adapted to receive rotational energy from the inner member. In a preferred embodiment, an electric actuator assembly operates the gripping assembly of the retrieval tool. In another preferred embodiment, the gripping assembly of the retrieval tool is mechanically operated by a screw driven cam assembly. In yet another embodiment, the retrieval tool is adapted to grip both the inside and outside of the object to be retrieved.
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Dock Matthew L.
Mullins H. Stanley
Sharp Richard Felix
Skinner John Allan
Bagnell David
McKinney & Stringer, P.C.
Stephenson Daniel
The Charles Machine Works, Inc.
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