Fluid pressure actuated firing mechanism for a well perforating

Details Fluid pressure actuated firing mechanism for a well perforating Fluid pressure actuated firing mechanism for a well perforating

1985-06-10

1986-08-19

Novosad, Stephen J.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 55, E21B 43116

Patent

active

046064095

ABSTRACT:
A compressed fluid pressure actuated firing mechanism for a well perforating gun comprises a hollow housing assembly defining a mounting for a primer, a hammer releasably secured above the primer for movement towards the primer, and a fluid pressure chamber associated with the hammer for effecting a compressed fluid pressure force on the latching mechanism for the hammer and on the hammer to move it into impact engagement with the primer. The fluid pressure applied to the hammer is produced by permitting a selected fluid pressure surrounding the fluid pressure chamber to be forced into the fluid pressure chamber through at least one unidirectional check valve, thus compressing the fluid pressure within the fluid pressure chamber. The upper portions of the hammer are in contact with this compressed fluid pressure and the lower portions of the hammer are in contact with the selected fluid pressure. Thus, a subsequent decrease in the selected fluid pressure allows the trapped fluid pressure to expand sufficiently to effect the release and firing movement of the hammer.

REFERENCES:
patent: 4345646 (1982-08-01), Terrell
patent: 4484632 (1984-11-01), Vann
patent: 4512406 (1985-04-01), Vann et al.
patent: 4526233 (1985-07-01), Stout
patent: 4538680 (1985-09-01), Brieger et al.
patent: 4544034 (1985-10-01), George

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