Magnetorheological fluid apparatus, especially adapted for...

Details Magnetorheological fluid apparatus, especially adapted for... Magnetorheological fluid apparatus, especially adapted for...

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 7/08 (2006.01)

Patent

CA 2379213

A rotatable steerable drill string in which guidance module controls the direction of the drilling. A magnetorheological fluid in the module supplies pressure to pistons that apply forces to the wall of the bore and thereby alter the direction of the drilling. The pressure applied by the magnetorheological fluid is regulated by valves that apply a magnetic field to the fluid so as to increase its fluid shear strength thereby controlling the actuation of the pistons and the direction of the drilling.

L'invention concerne un train de tiges orientable rotatif dans lequel un module de guidage commande la direction du forage. Un fluide magnétorhéologique situé dans le module exerce une pression sur des pistons qui appliquent des forces contre la paroi du trou et modifient ainsi la direction du forage. La pression appliquée par le fluide magnétorhéologique est régulée par des soupapes qui appliquent un champ magnétique sur le fluide de manière à augmenter sa résistance au cisaillement du fluide, permettant ainsi de commander les mouvements des pistons et la direction du forage.

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