Variable diameter expansion tool and expansion methods

Details Variable diameter expansion tool and expansion methods Variable diameter expansion tool and expansion methods

2006-10-10

2006-10-10

Bates, Zakiya W. (Department: 3676)

Wells

Expansible anchor or casing

Expansible casing

C166S118000, C166S217000

Reexamination Certificate

active

07117941

ABSTRACT:
The present inventions relate to improved apparatus and methods for radially expanding tubulars, such as tubing, casing and sand-control screen assemblies in a subterranean oil or gas well, and more specifically, to a variable diameter expansion tool for expanding downhole tubulars to varying diameters. In general, the inventions provide apparatus and methods for radially expanding a tubular, such as pipe, tubing, screen or screen assembly, deployed in a subterranean well by moving an expansion tool axially through the well. An automatically infinitely variable-diameter expansion cone tool is provided. A variable-diameter cone is provided, movable between an expanded position and a retracted position. The cone is enlarged to its expanded position and advanced through expandable components until a restriction is reached. At the restriction, the variable-diameter cone automatically retracts enough to allow the tool to continue advancing through the wellbore. When the restriction is past, the variable-diameter cone enlarges again to its expanded position.

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