| 摘要 |
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.
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