Apparatus and method for blocking well perforations
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United States of America Patent
Stats
-
Oct 10, 1995
Grant Date -
N/A
app pub date -
Jul 29, 1994
filing date -
Jul 29, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Perforations and cracks in wellbore liners or casings may be temporarily or permanently covered by a radially-expansible, coiled sleeve member formed by a sheet of elastically-deflectable material such as stainless steel which is coiled and placed in a cylinder which may be conveyed into a well to a working position for deployment of the sleeve to expand into engagement with the casing wall to block the perforations or cracks. The cylinder includes a sleeve ejecting piston which may be urged to rapidly eject the sleeve from the cylinder by pressure fluid conveyed to the cylinder by coilable tubing or by a gas-generating charge material electrically connected to an E-line which also may be used to deploy the cylinder into its working position in the well.
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