Method and apparatus for repairing well casings and the like

Details Method and apparatus for repairing well casings and the like Method and apparatus for repairing well casings and the like

1989-08-10

1990-11-20

Novosad, Stephen J.

Wells

Processes

Repairing object in well

138144, 156287, 156425, 166187, 166191, B32B 3120, E21B 2910, E21B 33124, E21B 33127

Patent

active

049711520

ABSTRACT:
The process involves creating an internal lining in a bore, e.g., for repairing well casings. A plurality of layers of resilient strip material having an adhesive material, in uncured condition and interspersed between overlapping surfaces of the strip material and between the outer surface thereof and the bore, are applied in spiral fashion by means of a mandrel to the portion of the bore to be lined. Pressure is then applied to the internal surface of the liner to force the liner against the inner surface of the bore, preferably by inflation of a packer or packer assembly whose length is substantially the length of the liner, until the adhesive is cured. The mandrel for creating the liner in a bore includes a portion adapted to receive the spirally-wrapped strip material, a packer at the upper end of the wrappable portion of the mandrel and a packer terminating at the lower end of the wrappable portion of the mandrel and extending therebelow.

REFERENCES:
patent: 3028915 (1962-04-01), Jennings
patent: 3080269 (1963-03-01), Pollock et al.
patent: 3111991 (1963-11-01), O'Neal
patent: 3167122 (1965-01-01), Lang
patent: 3179168 (1965-04-01), Vincent
patent: 3209835 (1965-10-01), Bourne, Jr. et al.
patent: 3364993 (1968-01-01), Skipper
patent: 3369426 (1968-02-01), Matz, Jr.

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