Oscillating shear valve for mud pulse telemetry

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/18 (2006.01)

Patent

CA 2439453

An anti-plugging oscillating shear valve system for generating pressure fluctuations in a flowing drilling fluid comprising a stationary stator and an oscillating rotor, both with axial flow passages. The rotor (103) oscillates in close proximity to the stator (102), at least partially blocking the flow through the stator and generating oscillating pressure pulses. The rotor passes through two zero speed positions during each cycle, facilitating rapid changes in signal phase, frequency, and/or amplitude facilitating enhanced data encoding. The rotor is driven by an electric motor (104) disposed in a lubricant filled housing (108). In one embodiment, the housing to shaft seal is a flexible bellows (107). In one embodiment, a torsional spring (105) is attached to the motor and the resulting spring mass system is designed to be near resonance at the desired pulse frequency. The torsion spring may be a solid torsion bar or a magnetic spring.

L'invention concerne un système de valve de cisaillement oscillante anti-obturation permettant de générer des fluctuations de pression dans un fluide de forage en mouvement, comprenant un stator fixe et un rotor oscillant, tous deux équipés de passages à flux axial. Le rotor oscille très près du stator, bloquant au moins partiellement le flux traversant le stator et générant des impulsions de pression oscillantes. Le rotor passe par deux positions à vitesse nulle durant chaque cycle, ce qui facilite des changements rapides de la phase du signal, de la fréquence et/ou de l'amplitude et permet par conséquent un meilleur codage des données. Le rotor est commandé par un moteur électrique situé dans un logement rempli de lubrifiant. Dans un mode de réalisation, le joint logement-arbre est du type flexible à soufflet. Dans un autre mode de réalisation, un ressort à torsion est fixé sur le moteur et le système masse à ressort est conçu pour se rapprocher de la résonance à la fréquence d'impulsion désirée. Le ressort à torsion peut être une barre de torsion solide ou un ressort magnétique.

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