Differential firing head and method of operation thereof

Details Differential firing head and method of operation thereof Differential firing head and method of operation thereof

1991-05-22

1992-11-10

Bagnell, David J.

Wells

Processes

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

166 63, 175 456, E21B 431185

Patent

active

051616165

ABSTRACT:
A differential firing head for a tubing conveyed perforation assembly includes a pressure-balanced firing pin propelled by a separate actuator assembly into a detonator to ignite charges in the gun. The actuator assembly includes a shock absorber which functions to keep fluid pressure momentum forces from being transmitted to the firing pin during movement of the tubing string, but which allows differential fluid pressure forces of a preselected magnitude to be applied to the firing pin for detonation of the gun.

REFERENCES:
patent: 4369654 (1983-01-01), Hallmark
patent: 4632034 (1986-12-01), Colle, Jr.
patent: 4655298 (1987-04-01), George et al.
patent: 4862964 (1989-09-01), George et al.
patent: 4911251 (1990-03-01), George et al.
patent: 5062485 (1991-11-01), Wesson et al.
Schlumber brochure, "Differential Pressure Firing Head (DPF) for Tubing Conveyed Perforating", 1987.

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