Tools and methods for use with expandable tubulars
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United States of America Patent
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-
Dec 4, 2001
Grant Date -
N/A
app pub date -
Dec 22, 1999
filing date -
Dec 22, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
Methods, apparatus and tools to be used with tubular expansion apparatus. In one aspect of the invention, tools are actuated or operated within a well by selectively expanding the tool wall. To actuate the tool, the tool wall is urged outward past its elastic limits. The expanding wall physically unlocks a locking ring which then unlocks a piston. Thereafter, hydraulic pressure differences are employed to move the piston to operate the downhole tool. In another aspect of the invention, a first piece of casing is joined to a second, larger diameter casing. By expanding the diameter of the first piece of casing into contact with the second piece of casing, the two are joined together. The joint is formed with helical formations in a manner that provides flow paths around the intersection of the two members for the passage of cement or other fluid.
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