Hydraulically balanced reciprocating pulser valve for mud...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/18 (2006.01) G08C 19/00 (2006.01) H04L 1/00 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2440815

A reciprocating pulser system for generating pressure fluctuations in a flowing drilling fluid comprising a reciprocating poppet and a stationary valve assembly with axial flow passages. The poppet reciprocates in close proximity to the valve assembly, at least partially blocking the flow through the valve assembly and generating oscillating pressure pulses. The poppet passes through two zero speed positions during each cycle, enabling rapid changes in signal phase, frequency, and/or amplitude thereby facilitating enhanced data encoding. The poppet is driven by a linear electric motor disposed in a lubricant filled housing. In one embodiment, the housing to shaft seal is a flexible bellows. In one embodiment, a force balance spring is used to essentially offset the hydraulic flow forces on the poppet. In one embodiment, a bypass poppet is used to adjust the differential pressure across the valve assembly.

L'invention concerne un système de pulsation alternatif permettant de générer des variations de pression dans un fluide de forage en circulation. Ce système de pulsation alternatif comprend un champignon alternatif et un ensemble soupape fixe dotés de passage de flux axial. Le champignon est animé d'un mouvement de va-et-vient à proximité de l'ensemble soupape, bloquant au moins partiellement la circulation à travers l'ensemble soupape et générant des impulsions de pression oscillantes. Le champignon passe à travers deux positions de vitesse nulle pendant chaque cycle, permettant des changements rapides de phase de signal, de fréquence, et/ou d'amplitude facilitant ainsi le codage amélioré de données. le champignon est entraîné par un moteur électrique linéaire placé dans un boîtier rempli de lubrifiant. Dans l'un des modes de réalisation, le joint d'étanchéité situé entre le boîtier et l'arbre est un joint d'étanchéité souple du type à soufflet. Dans un autre mode de réalisation, un ressort d'équilibrage de force est utilisé en vue de dévier les forces de flux hydrauliques sur le champignon. Dans un autre mode de réalisation encore, un champignon de déviation est utilisé en vue de régler la pression différentielle à travers l'ensemble soupape.

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