Hydraulic timing device

Details Hydraulic timing device Hydraulic timing device

2005-09-30

2008-03-25

Bagnell, David (Department: 3676)

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

C175S293000, C166S178000

Reexamination Certificate

active

07347287

ABSTRACT:
A jar for use in a downhole environment comprises an hydraulic timing device which allows pressure to be controllably increased to a desired level and, on firing, a near-instantaneous release of that pressure, and which allows for selective bi-directional firing of the jar.

REFERENCES:
patent: 4023630 (1977-05-01), Perkin et al.
patent: 4754821 (1988-07-01), Swietlik
patent: 5318139 (1994-06-01), Evans
patent: 5647446 (1997-07-01), Wenzel
patent: 6202767 (2001-03-01), Friis

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