Patent ID: 9109437
Filing Date: 2015-08-18
Classification: E21B

Abstract:
1. A method for centralizing an inner casing within an outer casing, comprising: introducing an expansion tool into the inner casing, the expansion tool having an elongate body having a first force multiplier case coupled to an expansion tool case; actuating a piston arranged within the first force multiplier case and thereby moving the piston axially in a first direction within the first force multiplier case; engaging a ram arranged within the expansion tool case with the piston, the ram defining a tapered surface engageable with a correspondingly tapered surface defined on the expansion tool case; radially expanding one or more lug assemblies arranged within the expansion tool case with the ram as the ram axially translates in the first direction; centering the ram within the first force multiplier case while the ram axially translates in the first direction by engaging the tapered surface of the ram on the correspondingly tapered surface of the expansion tool case; and plastically deforming the inner casing with the one or more lug assemblies, the one or more lug assemblies generating a corresponding one or more lobes in the inner casing configured to engage an inner surface of the outer casing.