Stepped Liner Hanger Expander

摘要

Disclosed is a tubular expansion tool which includes a plurality of stackable piston/slip/spring assemblies that are used to radially expand a liner against well casing along a longitudinal distance “L.” The pistons are repeatedly stroked a short distance “S” with the application of hydraulic pressure. As the pistons are stroked, they move a mandrel-expansion die sub assembly in successive steps a distance “S” to perform the tubular expansion over a longer distance “L.”

主权项

1. A method for radially expanding a subterranean well tubular along a longitudinal length “L”, wherein the tubular has an internal diameter “D” along the length “L” comprising:
inserting the tubular in the well; providing an expansion die with an outer diameter greater than “D,” operably connected to an actuation piston-cylinder assembly with a stroke length “S” and, wherein the stroke “S” is less than the length “L” and providing a ratchet assembly operably connecting the hydraulic piston-cylinder assembly to the expansion die; and repeatedly actuating the hydraulic piston-cylinder assembly to force the die to move longitudinally along the interior of the tubular a distance “L” to expand the tubular along the length “L.”