Downhole tool deployment safety system and methods

E - Fixed Constructions – 21 – B

Patent

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E21B 23/00 (2006.01) E21B 29/00 (2006.01) E21B 41/00 (2006.01) E21B 43/11 (2006.01) E21B 43/119 (2006.01)

Patent

CA 2485664

A safety system (100) for controlling the activation of one or more downhole tools (112) by providing selective transmission of an activation signal or an energy stream. The transmission of the activation signal or the energy stream is allowed after the tool (112) has passed below a known pre-determined depth. The safety system includes a first device (100A) in fixed relationship with the downhole tool (112) and a second device (100B) fixed a stationary location. The first device (100A) permits, after reaching the pre-determined depth, an initiation signal to reach an initiation device (114) associated with a downhole tool (112) or the energy stream to reach the tool (112). The second device (100B) positively engages the first device (100A) to provide an indication that the specified depth has been reached.

L'invention concerne un système de sécurité gérant l'activation d'un ou de plusieurs outils en fond de trou par transmission sélective d'un signal d'activation ou d'un flux d'énergie. Dans un mode de réalisation préféré, la transmission du signal d'activation ou du flux d'énergie est autorisé après que l'outil ait dépassé une profondeur connue déterminée. Un système de sécurité préféré comprend un premier dispositif en relation fixée avec l'outil en fond de trou et un second dispositif à l'emplacement stationnaire. Le premier dispositif permet, après avoir atteint la profondeur déterminée, soit (a) à un signal d'initiation d'atteindre un dispositif associé à un outil en fond de trou, soit (b) au flux d'énergie d'atteindre un outil en fond de trou. Le second dispositif engage le premier dispositif de façon positive de façon à fournir une indication spécifiant que la profondeur visée est atteinte.

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