Method of cementing deformable casing inside a borehole or a conduit
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United States of America Patent
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-
Feb 17, 1998
Grant Date -
N/A
app pub date -
Jan 11, 1996
filing date -
Mar 25, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A casing is cemented within a well bore (P) or pipe by means of a radially expandable tubular preform (1). For this purpose, a) folded preform (1) is inserted into the well (P) or pipe down to the required level; b) the well is sealed off at the bottom of the preform (10 by means of an inflatable hydraulic retainer (4); c) a curable fluid cement is injected onto the retainer so that it surrounds the lower portion of the preform; d) the preform is gradually unfolded from the top towards the bottom to press the cement against the wall of the well or pipe along the full length of the preform; e) the preform is cured to form a casing while the cement is allowed to set; and f) the retainer (4) is deflated and withdrawn from the well or pipe.
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