In-situ polymerization method and apparatus to seal a junction between a lateral and a main wellbore
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United States of America Patent
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-
Jan 18, 2000
Grant Date -
N/A
app pub date -
Aug 29, 1997
filing date -
Aug 30, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An improved method and apparatus for sealing a junction between a central and lateral wellbore is provided. In a broad aspect, the method of the present invention includes installing a polymerizable sealing sleeve within a first casing in a central wellbore at a junction between the first casing and a second casing in a lateral wellbore. After the sealing sleeve has been installed and allowed to cure, a milling tool is used to mill a window through a sidewall of the sealing sleeve and flush with the inner diameter of the second casing. The sealing sleeve may be used alone to establish a primary seal, or in combination with cement or other sealing substance, as used heretofore in prior art sealing methods, as a back-up seal. The sealing sleeve of the present invention may be provided with at least one orienting means to enable the second casing to be located and to direct a well tool thereinto.
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