Method of using an expansion tool for non-cemented casing annulus (CCA) wellbores

摘要

A method for centralizing an inner casing within an outer casing includes 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. A piston is arranged within the first force multiplier case and is actuated to move the piston axially in a first direction. A ram is arranged within the expansion tool case and engaged with the piston while moving in the first direction. One or more lug assemblies are arranged within the expansion tool case and are radially expanded with the ram as the ram axially translates in the first direction. The inner casing is plastically deformed with the one or more lug assemblies, which generate a corresponding one or more lugs in the inner casing configured to engage an inner surface of the outer casing.

主权项

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.