Methods and apparatus for selectively arming well bore explosive

Details Methods and apparatus for selectively arming well bore explosive Methods and apparatus for selectively arming well bore explosive

1991-09-04

1992-10-27

Brown, David H.

Ordnance

Well perforators

102222, 175 454, F42C 1500, E21B 43116

Patent

active

051591464

ABSTRACT:
In the representative embodiments of the several methods and apparatus of the invention, a barrier formed of a low-temperature fusible metal alloy having a selected melting point greater than the anticipated well bore temperatures is arranged between a receptor explosive and a typical electrically-initiated detonator enclosed in a housing for blocking the transmission of detonation forces from the detonator to the receptor explosive until the barrier has been heated by an electrical heater adjacent to the barrier. By selecting a fusible metal alloy which has a melting point higher than the known temperatures of the well bore fluids, when the tool is exposed to those elevated temperatures, the barrier will be predictably maintained in its solid state to continue blocking the detonation path of the donor explosive if the heater fails thereby allowing the well tool carrying the explosives to be safely recovered from the well bore.

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patent: 4852454 (1989-08-01), Batchelder
patent: 5070788 (1991-12-01), Carisella et al.

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