IN-SITU POLYMERIZATION OF AN INFLATABLE SLEEVE TO RELINE DAMAGED TUBING AND SHUT OFF PERFORATIONS

Finding an effective solution to seal off perforations to reduce gas f low, to reduce water cut, or to modify injection profiles has long bee n a subject of concern. Several solutions for through-tubing shut off have been tried with a varying level of success. This paper describes the operating principles, development, and field trials of a new techn ology designed to set a composite sleeve downhole for shutting off per forations or repairing tubing. Manufactured with fibers, elastomers, a nd thermosetting resins and run in on electric wireline, the sleeve is inflated with well fluid to seal against the inside of the casing. Af ter heating to harden the resins, the running equipment is extracted, leaving a pressure-resistant inner lining in place.