Remotely adjustable fishing jar

Boring or penetrating the earth – Below-ground impact members – Resiliently biased

Patent

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Details

166178, 175303, E21B 31107

Patent

active

049192191

ABSTRACT:
A jar tool for inclusion into a well fishing operating string which provides resilient tensional stretch to operate the tool. The tool is adapted to compress an upper release spring to store energy corresponding to tensional force in the operating string forces. A release latching lug array connects the spring to a central mandrel having an impact hammer. The tool housing forms an impact anvil. The spring is compressed to a designated compressional force by the distance that the latch lug array is moved before suddenly releasing the spring from the mandrel. The tension in the operating string then pulls the mandrel hammer into jarring impact with the housing anvil. The provision is made for designating this pre-release movement of the latching lug array and also provides remotely actuated apparatus for adjusting the distance of the pre-release movement and thereby the compressional force imparted into the spring.

REFERENCES:
patent: 2013127 (1935-09-01), Bowen
patent: 2199969 (1940-05-01), Hamm
patent: 3050131 (1962-08-01), Siracusa et al.
patent: 3685598 (1972-08-01), Nutter
patent: 3880249 (1975-04-01), Anderson
patent: 4333542 (1982-06-01), Taylor
patent: 4553614 (1985-11-01), Jurgens et al.
patent: 4662460 (1987-05-01), Loeb et al.
patent: 4688649 (1987-08-01), Buck
patent: 4694917 (1987-09-01), Heidemann et al.

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