Pipe joints or couplings – With assembly means or feature
Patent
1975-07-11
1976-08-03
Arola, Dave W.
Pipe joints or couplings
With assembly means or feature
285 3, 285175, 285315, 285321, 285330, 166 85, F16L 3500
Patent
active
039725464
ABSTRACT:
A locking assembly for use in a well for locking a first member to a second tubular well member which includes a locking notch. The assembly includes a locking dog carried by the first member and a locking sleeve positioned for longitudinal movement towards and away from the back side of the locking dog for locking and releasing the dog from the notch. The first member and sleeve are telescopically positioned relative to each other for longitudinal movement with a limited longitudinal lost motion between the first member and sleeve allowing longitudinal movement therebetween for setting and releasing the lock, but preventing disengagement between the first member and the sleeve so that the first member may be retrieved by retrieving the sleeve. A seal assembly connected to the locking assembly for sealing between a wellhead and a casing hanger which is locked in place by the locking assembly and is actuated by a rotative movement with non-threaded engaging means for energizing a resilient seal thereby avoiding remotely engaging threads. The seal assembly includes a left-handed threaded connection for energizing the seal by right-handed rotation thereby avoiding left-hand rotation in the well bore. The seal assembly components are connected by limited longitudinal lost motion connections for preventing disconnection of the parts in the well. The locking assembly and the seal assembly may be retrieved simply by longitudinal movement.
REFERENCES:
patent: 3468559 (1969-09-01), Ahlstone
patent: 3528686 (1970-09-01), Nelson
patent: 3807497 (1974-04-01), Baugh
patent: 3809158 (1974-05-01), Bond et al.
patent: 3837684 (1974-09-01), Hynes
Arola Dave W.
Nelson Norman A.
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