Liquid-disabled blasting cap

Details Liquid-disabled blasting cap Liquid-disabled blasting cap

1983-02-25

1985-02-05

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Electrical primer or ignitor

F42B 310

Patent

active

044972512

ABSTRACT:
A liquid-disabled blasting cap, especially useful in oil well perforation assemblies, has a perforated cap shell and a porous tubular member, e.g., a ceramic, adjacent the perforations. An ignition charge is present in the bore of the porous tubular member and in the cap's ignition train. The porous tubular member allows disabling liquids to be transferred to the ignition train from outside the cap through the holes in the shell wall, while at the same time acting as a protective barrier element between the holes and the ignition and explosive charges. In oil well caps, a B/Fe.sub.2 O.sub.3 ignition powder is preferred because of its high-temperature stability.

REFERENCES:
patent: 1901469 (1933-03-01), Piccard
patent: 2739535 (1956-03-01), Rolland et al.
patent: 2759417 (1956-08-01), O'Neill
patent: 2891477 (1959-06-01), Swanson
patent: 3372640 (1968-03-01), Dow et al.

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