Pressure assist detonating bar and method for a tubing conveyed

Details Pressure assist detonating bar and method for a tubing conveyed Pressure assist detonating bar and method for a tubing conveyed

1986-08-04

1988-08-09

Novosad, Stephen J.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 551, 175 456, E21B 43116

Patent

active

047621796

ABSTRACT:
A detonator bar has an outer housing, an inner housing connected to the outer housing by at least one first frangible member, an explosive charge disposed in the inner housing, and a firing piston with firing pin held in the inner housing by at least one retaining dog and at least one second frangible member. Operation occurs in response to a relatively small impact force between the detonator bar and a perforator or other explosive object located in a subterranean well. This relatively small impact breaks the at least one first frangible member. Thereafter, a fluid pressure existing in the subterranean well, such as a hydrostatic pressure within a tubing string on which a perforator is conveyed, is used to exert a sufficient force to break the at least one second frangible member after the at least one retaining dog has been released by downward movement of the outer housing relative to the inner housing, which relative movement occurs only after the initial impact force has broken the at least one first frangible member.

REFERENCES:
patent: 2876701 (1959-03-01), Long
patent: 3189094 (1965-06-01), Hyde
patent: 3800705 (1974-04-01), Tamplen
patent: 4531590 (1985-07-01), Peterson
patent: 4544034 (1985-10-01), George
patent: 4554981 (1985-11-01), Davies
patent: 4606409 (1986-08-01), Peterson et al.
patent: 4610312 (1986-09-01), Nelson et al.
patent: 4616718 (1986-10-01), Gambertoglio

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