Casing repair using a plastic resin

Details Casing repair using a plastic resin Casing repair using a plastic resin

1992-12-22

1994-03-22

Novosad, Stephen J.

Wells

Processes

Repairing object in well

166272, 166295, E21B 2910, E21B 33138, E21B 4324

Patent

active

052955419

ABSTRACT:
A method for replacing a damaged or corroded casing with a solid plastic is described herein. After removing the corroded or damaged casing from the wellbore, the borehole is underreamed to a desired diameter. Thereafter, a resin/curing agent mixture sufficient to form a hardened plastic or resin able to withstand downhole stresses, is placed into the wellbore so as to bind with the undamaged casing and close off any thief zone. Subsequently, the resin/curing agent mixture forms a hardened solid. The hardened solid is milled out so as to form a resinous casing the size of the original casing. Later, the hardened resinous casing is perforated to communicate with a targeted zone. Perforation is not required when isolating a zone.

REFERENCES:
patent: 2447629 (1948-08-01), Beissinger et al.
patent: 2495352 (1950-01-01), Smith
patent: 3111991 (1963-11-01), O'Neal
patent: 3194310 (1965-07-01), Loomis
patent: 3380528 (1968-04-01), Timmons
patent: 3918521 (1975-11-01), Snavely, Jr. et al.
patent: 4489783 (1984-12-01), Shu

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