Patent ID: 7083209

Claim:
A method for engaging a tubular body in a wellbore, comprising the steps of: running an overshot tool into the wellbore on a working string, the overshot tool comprising: housing having an inner surface and an outer surface, the outer surface forming an annulus within the surrounding wellbore; a gripping member having an inner surface and an outer surface, the inner surface of the gripping member being dimensioned to receive the item in the wellbore, and the outer surface of the gripping member being slidably movable along the inner surface of the housing; a fluid actuated piston disposed in the housing, the piston being operatively connected to the gripping member, and being slidably movable within the housing in response to a fluid pressure differential between the inner surface of the housing and the annulus so as to selectively move the gripping member between a first position in which the item is gripped and a second position in which the item is released; and a stop ring, the stop ring having an inner diameter that is smaller than the outer diameter of the body being retrieved from the wellbore, and being disposed between the piston and the gripping member; tagging the stop ring on a surface of the tubular body to be retrieved; and pulling the working string so as to cause the gripping member to engage and grip the tubular body.