Position indicating multiplexed control system for downhole...

E - Fixed Constructions – 21 – B

Patent

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E21B 23/00 (2006.01) E21B 47/09 (2006.01)

Patent

CA 2735367

Position indication in multiplexed downhole well tools. A method of selectively actuating and indicating a position in a well includes selecting at least one well tool from among multiple well tools for actuation by flowing direct current in one direction through a set of conductors in the well, the well tool being deselected for actuation when direct current flows through the set of conductors an opposite direction; and detecting a varying resistance across the set of conductors as the selected well tool is actuated, the variation in resistance providing an indication of a position of a portion of the selected well tool.

L'invention concerne lindication de position dans des outils multiplexés de fond de puits, et en particulier un procédé permettant deffectuer sélectivement lactionnement et lindication de position dans un puits, comportant les étapes consistant à sélectionner au moins un outil de puits parmi de multiples outils de puits en vue de son actionnement en faisant circuler un courant continu dans un sens à travers un ensemble de conducteurs installés dans le puits, loutil de puits étant désélectionné de lactionnement lorsquun courant continu circule à travers lensemble de conducteurs dans un sens opposé ; et à détecter une résistance variable à travers lensemble de conducteurs tandis que loutil de puits sélectionné est actionné, la variation de la résistance donnant une indication de la position dune partie de loutil de puits sélectionné.

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