Creating zonal isolation between the interior and exterior of a well system
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United States of America Patent
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Jun 6, 2000
Grant Date -
N/A
app pub date -
Aug 3, 1998
filing date -
Aug 1, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A method is provided for creating zonal isolation between the exterior and interior of an uncased section of an underground well system which is located adjacent to a well section in which a well casing is present. The method includes inserting an expandable tubular through the existing well casing into an uncased section, such as a lateral branch, of the underground well system and subsequently expanding the expandable tubular such that the one end is pressed towards the wall of the uncased section of the well system and the outer surface of the other end is pressed against the inner surface of the well casing thereby creating an interference fit capable of achieving a shear bond and a hydraulic seal between the surrounding surfaces.
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