High temperature selective fire perforating gun and switch there

Details High temperature selective fire perforating gun and switch there High temperature selective fire perforating gun and switch there

1982-04-27

1984-07-03

Purser, Ernest R.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Independent firing of plural charges

200 82B, E21B 43116, H01H 900

Patent

active

044573839

ABSTRACT:
A multiple shot selective fire perforating gun is provided for piercing oil field tubular goods, typically during the process of completing an oil or gas well. The perforating gun includes a multiplicity of shaped charges which are fired individually by an associated blasting cap and switch. The switch of all but the lowermost charge is configured to disarm its associated blasting cap until the next lower shaped charge has detonated. The generation of the pressure pulse from detonation of the next lower shaped charge causes a piston in the switch to move to compress a body of flowable material. The flowable material acts on a projectile which moves in a switch closing direction to arm the associated blasting cap.

REFERENCES:
patent: 3784771 (1974-01-01), Olsen
patent: 3941957 (1976-03-01), Tilman
patent: 4234768 (1980-11-01), Boop

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