High temperature and pressure igniter for downhole percussion co

Ammunition and explosives – Igniting devices and systems – Electrical primer or ignitor

Patent

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Details

175 4, E21B 4904, F42B 3107, F42B 312, F42C 1912

Patent

active

050315366

ABSTRACT:
An igniter is set forth in the present disclosure for use with a coring gun assembly. A bullet equipped with a bottom and having an O-ring thereabout is positioned in a chamber at one end thereof for firing to take a core sample. At the opposite end, an igniter is positioned in the chamber resting primarily on a shoulder aligning an elongate cylindrical shell within the chamber and having an external O-ring for sealing purposes. An elongate electrically insulated conductive firing pin extends through said shell so that an external circuit can be connected thereto to create a firing pulse. The current flows through the pin and through a bridgewire disc positioned at the end of the pin which in turn ignites a prepackaged cylindrical explosive charge to fire the bullet.

REFERENCES:
patent: 4339947 (1982-07-01), Wiley
patent: 4762067 (1988-08-01), Barker et al.
patent: 4944225 (1990-07-01), Barker
patent: 4979576 (1990-12-01), Barker et al.

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