Heat activated ballistic blocker

Details Heat activated ballistic blocker Heat activated ballistic blocker

1993-03-15

1994-09-13

Neuder, William P.

Wells

Processes

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

102201, 166302, 166 55, 175 454, E21B 43116

Patent

active

053460146

ABSTRACT:
A method and an apparatus for use in a wellbore are provided to prevent an igniter from igniting a pyrotechnic device within a downhole well tool until after the downhole well tool is positioned downhole within the wellbore. A blocking member is movable between two positions for selectively obstructing an ignition pathway between the igniter and pyrotechnic device. An actuator is provided which, when heated to an activation temperature by downhole well temperatures, moves the blocking member from a position obstructing the ignition pathway to a position for allowing the igniter to ignite the pyrotechnic device.

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SPE Paper No. 22556, Carisella et al, Three New Systems That Prevent Firing of Perforating Guns and String Shots On or Near the Surface.

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