Apparatus and method for retrieving an object from a well bore,

Details Apparatus and method for retrieving an object from a well bore, Apparatus and method for retrieving an object from a well bore,

1994-05-18

1995-04-25

Novosad, Stephen J.

Wells

Processes

Freeing stuck object, grappling or fishing in well

166 99, 166380, E21B 3100, E21B 3118

Patent

active

054090652

ABSTRACT:
An apparatus for retrieving objects from well bores includes an uppermost segment having an internally threaded opening extending upwardly from a bottom end of the uppermost segment to a first location above the bottom end. One or more additional segments are provided. Each of the additional segments have top and bottom ends and are removably attachable, at a top end of each additional segment, to a bottom end of one of an upper one of the additional segments and the uppermost segment. Each of the additional segments have a tapered, internally threaded opening extending between the top end and the bottom end of the additional segments. A top end of the uppermost segment is secured to a bottom end of a rotatable down-hole drill rod and is lowered down around and rotated relative to an object to be retrieved such that threads on the tapered, internally threaded opening engage with the object. A method for using the apparatus and a method for making a retrieving tool are also disclosed.

REFERENCES:
patent: 2304793 (1942-12-01), Bodine, Jr.
patent: 2650129 (1953-08-01), Axelsen
patent: 3358765 (1967-12-01), Le Blanc
patent: 3393002 (1968-07-01), Woolley
patent: 3417822 (1968-12-01), Howell
patent: 5020599 (1991-06-01), Lau

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