Liquid-disabled blasting cap
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United States of America Patent
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-
Feb 5, 1985
Grant Date -
N/A
app pub date -
Feb 25, 1983
filing date -
Feb 25, 1983
priority date (Note) -
Expired
status (Latency Note)
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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.
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