Patent ID: 8066078
Filing Date: 2011-11-29
Classification: E21B

Abstract:
1. An overshot tool for interconnecting and sealing between a lower tubular in a well and an upper tubular in the well, the overshot tool comprising: a tubular expander sleeve supported in the well on the upper tubular; an overshot sleeve supported in the well on the upper tubular, the overshot sleeve having an internal diameter greater than the outer diameter of the lower tubular for circumferentially surrounding a portion of the lower tubular; a tool housing positioned in the well on a workstring and enclosing a plurality of axially movable stacked pistons for generating a cumulative axial force, each of the plurality of pistons axially movable in response to pressurized fluid transmitted downhole to the pistons on the workstring; an anchor supported on the work string for engaging an inner surface of the lower tubular and axially fixing the tool in the well, the anchor movable from a run-in position to a set position; and the tool housing axially movable relative to a tool mandrel in response to the plurality of pistons, the tool housing movable to push the expander sleeve axially downward to radially expand a portion of the lower tubular, such that the overshot sleeve is connected to and sealed with the expanded lower tubular.