Jar tool

Details Jar tool Jar tool

1982-02-25

1984-10-23

Novosad, Stephen J.

Wells

Processes

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

166299, E21B 31113

Patent

active

044782845

ABSTRACT:
A jar tool for use in a drill string for use in dislodging a drill bit or well-tools trapped in well bores. The tool comprises an outer housing adapted to move longitudinally with respect to an inner spline mandrell. A piston assembly is acted on by a piston actuator and hydraulic fluid restricts the movement of the piston assembly and, therefore, the movement of the mandrell relative to the housing, while the piston assembly is within a narrower portion of a hydraulic cylinder. When the piston assembly reaches a larger diameter portion of the cylinder, the hydraulic fluid rushes past the piston assembly which allows a knocker connected to the spline mandrell to collide with the outer housing. A compression spring returns the piston assembly to its rest position abutting a shoulder on the outer housing. Provision is made for pressure release values to be inserted in the piston assembly so that the tool can be operated within minimum and maximum operating limits.

REFERENCES:
patent: 3323550 (1967-06-01), Lee
patent: 3340899 (1967-09-01), Welty et al.
patent: 3349858 (1967-10-01), Chenoweth
patent: 3851717 (1974-12-01), Berryman
patent: 3949821 (1976-04-01), Raugust
patent: 4076086 (1978-02-01), Evans
patent: 4111271 (1978-09-01), Perkins
patent: 4161224 (1979-07-01), Hostrup
patent: 4196782 (1980-04-01), Blanton
patent: 4284153 (1981-08-01), Reaugh

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