Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature
Patent
1996-01-16
1997-01-28
Tsay, Frank
Wells
Means for perforating, weakening, bending or separating pipe...
With disparate below ground feature
166 791, 166 921, E21B 2908, E21B 3500
Patent
active
055970419
ABSTRACT:
Systems and methods for cutting a well casing and then capping the cut well casing are provided. A well casing cutting assembly having a tensioned wire cutting element may first be moved into position relative to the well casing and operated so that the cutting element reciprocates transversely (i.e., in saw-like fashion) while simultaneously being advanced forwardly into cutting relationship with the well casing. The cutting assembly is removed from the cut well casing and replaced with a well capping assembly having a shield enclosure and a thread cutting subassembly. The thread cutting subassembly includes an interiorly threaded pipe coupling which rigidly carries a normally open, remotely controlled valving assembly and is mounted to the shield enclosure so as to be capable of both rotational and vertical movements relative to the cut well casing. By simultaneously rotating and downwardly displacing the thread cutting element, threads will be formed on the exterior surface of the well casing and will threadably couple the pipe coupling automatically thereto. The valving mechanism may then be operated so as to cap the well casing. Structure is provided which enable quick disassembly of the thread cutting subassembly from the pipe coupling so that the well capping assembly can be removed and reused.
REFERENCES:
patent: 739377 (1903-09-01), Bell
patent: 1485862 (1924-03-01), Lester
patent: 1520288 (1924-12-01), Featherstone
patent: 1857788 (1932-05-01), Murphy
patent: 5121797 (1992-06-01), De Cuir, Sr.
patent: 5150752 (1992-09-01), Gunst et al.
patent: 5158138 (1992-10-01), De Cuir, Sr.
patent: 5159983 (1992-11-01), Barrow et al.
patent: 5361840 (1994-11-01), Matthews
Tsay Frank
Wellcutter Inc.
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