An apparatus for creating pressure pulses in the fluid of a...

E - Fixed Constructions – 21 – B

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E21B 47/18 (2006.01)

Patent

CA 2668474

An apparatus for creating pressure pulses in the fluid of a bore hole is described. The preferred embodiment takes the form of a mud pulser apparatus (10) having a signalling valve controlled by a variable pilot valve (34). The forces on the signalling valve are balanced and controlled by the flow of mud through the variable orifice of the pilot valve. The arrangement is such as to act like a hydraulic amplifier, and results in the signalling valve being compensated for variable flow rates. In the preferred embodiment, the pilot valve has rotary vanes that allow it to be self-cleaning.

L'objet de la présente invention concerne un appareil destiné à créer des impulsions de pression dans le fluide d'un trou de forage. Il s'agit, dans le mode de réalisation préféré, d'un générateur d'impulsions de boue (10) sur lequel se trouve une soupape de signalisation commandée par une soupape de commande variable (34). Les forces s'exerçant sur la soupape de signalisation sont équilibrées et commandées par le flux de boue qui s'écoule par l'orifice variable de la soupape de commande. L'ensemble est constitué de manière à agir comme un amplificateur hydraulique, les résultats, sur la soupape de signalisation, faisant apparaître une compensation par rapport à des taux de flux variables. Dans le mode de réalisation préféré, la soupape de commande dispose d'aubes rotatives qui lui permettent d'être autonettoyante.

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