Fluid retarded accelerating jar with negative and positive press

Details Fluid retarded accelerating jar with negative and positive press Fluid retarded accelerating jar with negative and positive press

1978-03-03

1980-04-29

Purser, Ernest R.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

175296, 166178, E21B 110

Patent

active

042001587

ABSTRACT:
A hydraulic drilling jar apparatus having axially elongated outer housing and inner mandrel members that telescope relative to each other when tripped by a predetermined axial force applied to the mandrel to deliver an impact blow to an object stuck in a well bore. A negative pressure is developed within the apparatus during initial retarded telescoping movement to effect acceleration of the mandrel member upon release at a rate exceeding the acceleration rate otherwise imposed by the axial force.

REFERENCES:
patent: 3642069 (1972-02-01), Adkins
patent: 3815693 (1974-06-01), Sutliff et al.
patent: 3834472 (1974-09-01), Perkins
patent: 3853187 (1974-12-01), Sutliff et al.
patent: 4076086 (1978-02-01), Evans

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