System and method for damping vibration in a drill string...

F - Mech Eng,Light,Heat,Weapons – 16 – F

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F16F 9/53 (2006.01) F16F 6/00 (2006.01) F16F 9/46 (2006.01) F16F 15/027 (2006.01)

Patent

CA 2754204

A system for damping vibration in a drill string can include a magnetorheological fluid valve assembly having a supply of a magnetorheological fluid, a first member, and a second member capable ofmoving in relation to first member in response to vibration of the drill bit The first and second members define a first and a second chamber for holding the fluid Fluid can flow between the first and second chambers in response to the movement ofthe second member in relation to the first member The valve assembly can also include a coil for inducing a magnetic field that alters the resistance ofthe magnetorheological fluid to flow between the first and second chambers, thereby increasing the damping provided by the valve A remanent magnetic field is induced during operation that can be used to provide the magnetic field for operating the valve so as to eliminate the need to energize the coils

La présente invention porte sur un système permettant d'amortir des vibrations dans un train de tiges. Ledit système peut comprendre un ensemble valve pour fluide magnétorhéologique ayant une alimentation en fluide magnétorhéologique, un premier élément et un second élément qui peut se déplacer par rapport au premier élément en réponse aux vibrations du trépan. Les premier et second éléments définissent une première et une seconde chambre pour contenir le fluide. Le fluide peut circuler entre les première et seconde chambres en réponse au mouvement du second élément par rapport au premier élément. L'ensemble valve peut également comprendre une bobine pour induire un champ magnétique qui modifie la résistance du fluide magnétorhéologique devant circuler entre les première et seconde chambres, ce qui permet d'augmenter l'amortissement réalisé par la valve. Un champ magnétique rémanent est induit pendant l'opération et peut être utilisé pour fournir le champ magnétique pour faire fonctionner la valve de sorte à éliminer le besoin de mettre sous tension les bobines.

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