Patent ID: 7845421

Claim:
A tool for radially expanding a downhole tubular, comprising: a tubular expander having a generally tapered outer surface for radially expanding the downhole tubular as the expander is moved upward within the downhole tubular; a downhole actuator for forcibly moving the expander axially upward within the downhole tubular; and buttress threads on the tubular expander for supporting the tubular expander on the downhole tubular when the expander is run in the well with the downhole tubular, the buttress threads having a tension flank that is substantially perpendicular to or is angled downwardly and radially outwardly with respect to a central axis of the tool, such that the buttress threads support the tubular expander when run in the well and release the tubular expander to move axially upward with respect to the downhole tubular to radially expand the downhole tubular.