High pressure casing patch

Details High pressure casing patch High pressure casing patch

1996-05-07

1998-11-03

Dang, Hoang C.

Wells

Processes

Repairing object in well

1662427, 285351, 285917, F21B 1702

Patent

active

058295240

ABSTRACT:
A casing patch is disclosed which uses one or more fins which elastically flex to accept a casing stub. The casing stub is prepared with a dressing tool containing a special mill to obtain the requisite finish on its outer surface prior to insertion of the casing patch. The flexible fin or fins provide a metal-to-metal seal to the outer surface of the casing patch and a grip assembly holds the joint together. In certain applications, the fins can be combined with a resilient seal where the fins preferably provide a complete extrusion barrier to the resilient seals. Using the fins which preferably are integral to the body, alone or in combination with a resilient seal or seals, the wall thickness of the joint can be maintained at thicker values for a given size as compared to prior designs, thus, ensuring a sufficient pressure rating for the joint which is at least equal to the rating of the casing stub.

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Baker Oil Tools, Catalog, Fishing Services, pp. 13-16, 54, date unknown.
Composite Catalog, Bowen Packer Type Tubing and Casing Patches,Bowen Lwad Seal Tubing and Casing Patches, date unknown.
Gotco International, Inc., Casing Patch, p. 12, date unknown.

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