Retrieving objects from wells

Details Retrieving objects from wells Retrieving objects from wells

E - Fixed Constructions

21

B

166/59

E21B 31/00 (2006.01) E21B 27/00 (2006.01) E21B 31/16 (2006.01) E21B 31/18 (2006.01)

Patent

CA 1194412

ABSTRACT A wash over type down hole retrieving device or fishing tool is described, consisting of a hollow cylin- drical body having an open lower end. The body has concentric inner and outer walls, defining an annular space in which an annular piston can force down an annular sleeve of a malleable alloy having downwardly extending finger-like formations. The inside of the lower end of the outer wall is of cupped configuration effective to deflect the fingers inwards and over the open, end of the body so to trap and retain an object for retrieval. The annular piston is forced down hydraulically by dropping a diverter ball valve. Cutting teeth are optionally provided on the outer periphery of the lower end of the outer wall, on a detachable shoe.

442967

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