Thermal generator for downhole tools

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/1185 (2006.01) E21B 36/00 (2006.01) E21B 43/24 (2006.01)

Patent

CA 2436456

An ignition device for a downhole tool includes a body with a cavity, a thermite material and a resistive element within the cavity. The resistive element, which is heated to the high temperature needed for ignition of the thermite material, has a non-galvanic outer surface at the ignition temperature. A large amount of electrical power is required to reach the ignition temperature, making the device safe and unlikely to accidentally ignite. The device has an electrical connector that is located within a sealed chamber when downhole.

Un dispositif d'allumage pour outils de fond de trou comprend un corps avec une cavité, un matériau thermique et un élément résistif dans la cavité. L'élément résistif, qui est chauffé à la température élevée nécessaire pour l'allumage du matériau thermique, a une surface non-galvanique extérieure à la température d'allumage. Une grande quantité d'énergie électrique est nécessaire pour atteindre la température d'allumage, ce qui rend l'appareil sécuritaire et peu susceptible de s'allumer accidentellement. L'appareil dispose d'un connecteur électrique qui se trouve dans une chambre étanche lorsque le dispositif est dans le fond de trou.

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