Device for retrieving objects from wells

Details Device for retrieving objects from wells Device for retrieving objects from wells

1985-04-09

1985-10-08

Novosad, Stephen J.

Wells

With junk retrieving means

175250, 294 8611, E21B 3108

Patent

active

045454329

ABSTRACT:
A wash-over type down hole retrieving device or fishing tool is described, consisting of a hollow cylindrical 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 as 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.

REFERENCES:
patent: 2266739 (1941-12-01), Cooper
patent: 2709617 (1955-05-01), Lang
patent: 2977147 (1961-03-01), Cooper

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