Hydraulic fishing jar having tandem piston arrangement

Details Hydraulic fishing jar having tandem piston arrangement Hydraulic fishing jar having tandem piston arrangement

1977-02-04

1977-11-22

Leppink, James A.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

E21B 110

Patent

active

040591670

ABSTRACT:
The present invention relates to a hydraulic fishing jar adapted to be run into a well on a fishing string and connected to a fishing tool in the well bore. The jar comprises inner and outer telescopically interengaged bodies. A plurality of diametrically defined pressure areas, each of said pressure areas having upper and lower sealed ends, are contained within the jar. Tandem piston means are immediate one of said upper and lower sealed ends of each of the pressure areas. Seal means are carried by one of the inner and outer interengagable bodies and are engagable by the other of the inner and outer interengagable bodies and define one of the upper and lower sealed ends of the pressure areas. Seal means are provided between the piston means and one of the inner and outer telescopically interengaged bodies and define one of the upper and lower sealed ends of the pressure areas. The pressure areas are in fluid communication with one another and define a chamber for receipt of lubricant therewithin.

REFERENCES:
patent: 2621024 (1952-12-01), Koppl et al.
patent: 3285353 (1966-11-01), Young
patent: 3851717 (1974-12-01), Berryman

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