Hold down apparatus for wireline operated gun

Details Hold down apparatus for wireline operated gun Hold down apparatus for wireline operated gun

1982-06-07

1985-11-26

Novosad, Stephen J.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 551, 175 452, E21B 43119

Patent

active

045549753

ABSTRACT:
A hold down apparatus for a wireline operated perforating gun which prevents the gun from being thrust uphole when the gun is fired. The hold down apparatus enables the gun to be run downhole in a tubing or casing string, without the necessity of filling the pipe with liquid. The hold down apparatus includes a releasable anchor apparatus which is selectively set when the gun is manipulated vertically in a particular manner by the wireline. The gun is run downhole and positioned at the zone where the perforations are to be formed. The gun is lifted a finite distance, then lowered a finite distance, and then lifted again, thereby setting a pair of slips which are located in underlying relationship with respect to the gun. The gun remains anchored downhole so long as tension is maintained on the wireline. The gun is fired and subsequently released by lowering the gun a finite distance whereupon the anchoring device releases the slips from engagement with the piping. The gun can then be lifted uphole. Another zone can be perforated by again lowering the gun and then lifting the gun whereupon the anchor apparatus is again set. This manipulation of the gun with the wireline in order to release or set the anchor apparatus can be continued as many times as desired.

REFERENCES:
patent: 1608167 (1926-11-01), Crowell et al.
patent: 2173903 (1939-09-01), Halliburton
patent: 3054454 (1962-09-01), Evans
patent: 3209832 (1965-10-01), Tausch
patent: 3695368 (1972-10-01), Lanmon, II

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