Redundant firing mechanism for a well perforating gun

Details Redundant firing mechanism for a well perforating gun Redundant firing mechanism for a well perforating gun

1985-06-10

1986-09-09

Novosad, Stephen J.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

With wall engaging packer or anchor

175 454, 175 456, E21B 4311

Patent

active

046103120

ABSTRACT:
A redundant firing mechanism for a perforating gun utilized in subterranean wells comprises a hollow housing assembly incorporating two spaced primer charges disposed in vertically spaced relationship. A fluid pressure chamber is defined within the hollow housing assembly and is closed at the top end of the assembly by a frangible barrier disc. A fluid pressure actuated hammer is provided to impact upon the lowermost one of the primers in response to fluid pressure developed in the fluid pressure chamber. In the event that the lowermost primer does not detonate, a detonating bar may then be dropped through the tubing string to break the frangible barrier and impact upon a second hammer disposed in overlying relationship to the second primer.

REFERENCES:
patent: 4498541 (1985-02-01), Brieger et al.
patent: 4509604 (1985-04-01), Upchurch
patent: 4531590 (1985-07-01), Peterson
patent: 4544034 (1985-10-01), George
patent: 4564076 (1986-01-01), Vann et al.

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