Valve for a two way hydraulic drilling jar and a two way hydraul

Details Valve for a two way hydraulic drilling jar and a two way hydraul Valve for a two way hydraulic drilling jar and a two way hydraul

1996-09-30

1998-07-07

Graysay, Tamara L.

Wells

With jar means for releasing stuck part

175297, 251126, E21B 2300, F16K 4700

Patent

active

057754233

ABSTRACT:
A valve for a two way hydraulic drilling jar which includes a hollow cylindrical member having an exterior surface, an interior surface, a first end and a second end. At least one spiral-form fluid bypass passage is positioned in each of the first end and the second end of the cylindrical member. The at least one spiral-form bypass passages has a first end communicating with the exterior surface and a second end communicating with the interior surface.

REFERENCES:
patent: 4111271 (1978-09-01), Perkins
patent: 5647446 (1997-07-01), Wenzel

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