Well tool having magnetically coupled position sensor

Details Well tool having magnetically coupled position sensor Well tool having magnetically coupled position sensor

E - Fixed Constructions

21

B

E21B 34/00 (2006.01) G01B 7/14 (2006.01) E21B 43/119 (2006.01)

Patent

CA 2637382

A well tool having a magnetically coupled position sensor. In operation of a well, tool, relative displacement is produced between members of the well tool. A magnetically coupled position sensor includes one magnet assembly attached to a member for displacement therewith and another magnet assembly movably attached to the other member and magnetically coupled to the first magnet assembly for displacement therewith. The position sensor further includes a magnetically permeable material which increases a magnetic flux density between the magnet assemblies. In another position sensor, one magnet assembly includes a magnet having a pole axis, the other magnet assembly includes another magnet having another pole axis, and the pole axes are aligned with each other.

L~invention concerne un outil de puits doté d~un détecteur de position à couplage magnétique. L~outil comprend deux éléments qui, lorsqu~il fonctionne, se déplacent l~un par rapport à l~autre. Un détecteur de position à couplage magnétique comprend un ensemble aimant attaché au premier élément pour se déplacer avec lui et un autre ensemble aimant attaché de façon mobile au deuxième élément et couplé magnétiquement au premier ensemble aimant pour se déplacer avec lui. Le détecteur de position comporte en outre un matériau magnétiquement perméable qui accroît la densité de flux magnétique entre les ensembles aimants. Dans un autre mode de réalisation du détecteur de position, un ensemble aimant comporte un aimant présentant un certain axe polaire, l~autre ensemble aimant comporte un autre aimant présentant un autre axe polaire, et les axes polaires sont alignés l~un sur l~autre.

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