Differential firing head

Details Differential firing head Differential firing head

E - Fixed Constructions

21

B

E21B 43/116 (2006.01) E21B 34/10 (2006.01) E21B 43/118 (2006.01) E21B 43/1185 (2006.01)

Patent

CA 2068230

- 25 - Abstract of the Disclosure 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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