Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent
1989-07-03
1991-06-11
Dang, Hoang C.
Boring or penetrating the earth
Below-ground impact members
Resiliently biased
166178, 175302, 175304, E21B 31107
Patent
active
050224735
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 force. 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 in an adjustable latch release sleeve 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. Provision is made for designating this pre-release movement of the latching lug array and also provides apparatus for adjusting the distance of the pre-release movement and thereby the compressional force imparted into the spring.
REFERENCES:
patent: 3685598 (1972-08-01), Nutter
patent: 3880249 (1975-04-01), Anderson
patent: 4036312 (1977-07-01), Deluish
patent: 4333542 (1982-06-01), Taylor
patent: 4553614 (1985-11-01), Jurgens et al.
patent: 4662460 (1987-05-01), Loeb et al.
patent: 4694917 (1987-09-01), Heidemann et al.
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