Hydraulic jar with improved detent ring

Details Hydraulic jar with improved detent ring Hydraulic jar with improved detent ring

1995-07-24

1997-01-21

Tsay, Frank

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, E21B 414

Patent

active

055952534

ABSTRACT:
There is disclosed a double acting hydraulic jar of such construction as to permit it to be "short cocked" during either an up or down jar, and further in which flow past a detent in metered in such a way as to permit lesser flow therepast during an upward jar than during a downward jar, whereby the rate of movement of the detent ring through a restriction, and thus the "delay", may be essentially the same during both up and down jars.

REFERENCES:
patent: 4109736 (1978-08-01), Webb et al.
patent: 4361195 (1982-11-01), Evans
patent: 4456081 (1984-06-01), Newman
patent: 4582148 (1986-04-01), Walter
patent: 5086853 (1992-02-01), Evans
patent: 5174393 (1992-12-01), Roberts et al.
patent: 5425430 (1995-06-01), Roberts
patent: 5431221 (1995-07-01), Roberts et al.
patent: 5447196 (1995-09-01), Roberts

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