초록 ▼

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 un

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.

대표청구항 ▼

[ What is claimed:] [1.]1. A tool for performing a downhole operation, comprising:a tubular body forming a wall, the wall having an interior which defines a passage therein and an exterior which, when placed in the wellbore, defines an annular space therewith;an actuating member movably mounted on t

[ What is claimed:] [1.]1. A tool for performing a downhole operation, comprising:a tubular body forming a wall, the wall having an interior which defines a passage therein and an exterior which, when placed in the wellbore, defines an annular space therewith;an actuating member movably mounted on the outside of the wall for performing the downhole operation; anda locking member mounted on the outside of the wall to selectively prevent motion of said actuating member until said locking member is unlocked responsive to expansion of the wall of the tubular body.