Tubing pressurized firing apparatus for a tubing conveyed perforating gun
A tubing pressurized firing apparatus is shown for use with a tubing conveyed perforating gun of the type used to perforate a cased well bore. The firing apparatus has a tubular body with an upper end for connection in the well tubing string and with a lower end for connection to a well perforating gun. An inner mandrel is slidably mounted within the tubular body and has a ball seat formed in the interior bore thereof for receiving a ball dropped through the well tubing string. The ball and ball seat together form a pressure tight seal whereby tubing pressure in the well tubing string acts on the inner mandrel to slide the mandrel downwardly within the tubular body. A cocking mechanism located below the inner mandrel within the body includes a lockout member which is initially positioned between a detonating pin and a percussion detonator. The cocking mechanism is actuated by downward sliding movement of the inner mandrel to move the lockout member from between the detonating pin and percussion detonator whereby a subsequent release of tubing pressure and upward sliding movement of the inner mandrel exposes the detonating pin to the percussion detonator to actuate the detonator and fire the perforating gun.
- Assignee:
- Hughes Tool Company
- Patent Number(s):
- US 4554981
- OSTI ID:
- 5700395
- Resource Relation:
- Patent Priority Date: Priority date 5 Jul 1985, United Arab Emirates; Other Information: PAT-APPL-751999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Firing head for a tubing conveyed perforating gun
Firing system for tubing conveyed perforating gun