E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/116 (2006.01)
Patent
CA 2470562
A firing head sub for use in explosive well perforation is described. The firing head initiates the firing of a charge within a downhole gun, and also releases the firing head and gun from the tubing string upon firing so as to avoid clogging of the gun with sand and jamming of the gun downhole. The firing head and gun will only be released upon detonation of the charge. This is ensured by a feedback loop that returns spent detonation gas to the firing head to shift a sleeve, thereby unbiasing the firing head latches from their engagement with the tubing string connector, thereby releasing the firing head from the tubing string.
Borden Ladner Gervais Llp
Explosives Limited
LandOfFree
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