Firing head

Details Firing head Firing head

E - Fixed Constructions

21

B

E21B 43/11 (2006.01)

Patent

CA 2173409

An explosive or combustion actuated subsurface well tool includes a firing head for initiating operation of the tool in response to a projectile, such as a ball or go-devil, being pumped down a tubing string extending from the surface. The firing head includes a passage sized to closely receive the ball or go-devil, in either a sealed manner in which substantially no liquid leaks around the pumped projectile or in an unsealed manner in which a small amount of liquid leaks around the projectile. As the projectile moves into the passage, the pressure drop across the projectile becomes quite large creating a large force sufficient to shear a safety pin, drive home a firing pin or otherwise initiating operation of the subsurface well tool.

Outil de forage actionné au moyen d'un dispositif explosif ou à combustion comportant une amorce pour lancer le fonctionnement de l'outil après qu'un projectile, par exemple une balle ou un dispositif appelé go-devil, a été descendu par pompage dans une colonne de tubage à partir de la surface. L'amorce comporte un passage dont la taille lui permet de recevoir étroitement la balle ou le go-devil, soit en mode scellé où pratiquement aucun liquide ne peut couler autour du projectile pompé, soit en mode non scellé où une petite quantité de liquide peut couler autour du projectile. € mesure que le projectile avance dans le passage, la chute de pression autour du projectile devient plus importante, ce qui crée une force suffisante pour arracher la goupille de sécurité, permettre au percuteur d'atteindre sa cible ou d'amorcer le fonctionnement de l'outil de forage.

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