Back-off apparatus and method for retrieving pipe from wells

Details Back-off apparatus and method for retrieving pipe from wells Back-off apparatus and method for retrieving pipe from wells

1976-03-05

1977-02-15

Novosad, Stephen J.

Wells

Processes

With explosion or breaking container to implode

166 63, 166178, 166301, 175301, E21B 2304

Patent

active

040077900

ABSTRACT:
A new and improved apparatus and method for lowering the apparatus downwardly in a drill string on a wireline to releasably engage a recess in a threaded joint or collar of the drill string to prevent further downward movement of the apparatus and to thereafter detonate an explosive by manipulating a wireline actuated jar with repeated downward blows for exerting a jarring force to the joint as a result of the explosion to release the threads at the joint upon simultaneous application of a back-off torque to the drill string. The apparatus can be released and removed from the well without breaking or damaging the collar locating and supporting portion of the apparatus.

REFERENCES:
patent: 1560815 (1925-11-01), Hill
patent: 2251113 (1941-07-01), Chapman
patent: 2358466 (1944-09-01), Miller
patent: 2839143 (1958-06-01), Alexander
patent: 3157119 (1964-11-01), Porter
patent: 3180261 (1965-04-01), Moore
patent: 3374735 (1968-03-01), Moore
patent: 3491830 (1970-01-01), Sweetman

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