APPARATUS AND METHOD FOR RETRIEVING AN OBJECT FROM A WELL BORE, AND METHOD FOR MAKING A TOOL FOR RETRIEVING OBJECTS FROM A WELL BORE

摘要

An apparatus for retrieving objects from well bores includes an uppermostsegment having an internally threaded opening extending upwardly from abottom end of the uppermost segment to a first location above the bottomend. One or more additional segments are provided. Each of the additionalsegments have top and bottom ends and are removably attachable, at a topend of each additional segment to a bottom end of one of an upper one ofthe additional segments and the uppermost segment. Each of the additionalsegments have a tapered, internally threaded opening extending between thetop end and the bottom end of the additional segments. A top end of theuppermost segment is secured to a bottom end of a rotatable down-hole drillrod and is lowered down around and rotated relative to an object to beretrieved such that threads on the tapered, internally threaded openingengage with the object. A method for using the apparatus and a method formaking a retrieving tool are also disclosed.