Well apparatus

Wells – Expansible anchor or casing – Liner hanger

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Details

166217, E21B 4300

Patent

active

055159176

ABSTRACT:
There is disclosed well apparatus wherein a so-called "backout sub" connected by right-hand threads at its lower end to a lower well pipe has both left-hand threads thereabout for connection with left-hand threads on the lower end of one upper tubular member to permit it to be released and raised from the lower tubular member, in response to right hand rotation of the upper tubular member, and right-hand threads for connection with right-hand threads on the lower end of another upper tubular member for use in tying the lower tubular member and thus the lower well pipe back to the head of the well in response to right-hand rotation.

REFERENCES:
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patent: 3468558 (1969-09-01), Ahlstone
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patent: 5026097 (1991-06-01), Reimert
patent: 5195586 (1993-03-01), Gambertoglio
patent: 5299642 (1994-04-01), Nelson et al.
4-Page Brochure entitled "Emergency Backout Sub", Dril-Quip, Inc. (1991).

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