Apparatus for keeping a down hole drilling tool vertically...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01)

Patent

CA 2640182

An apparatus (10) for keeping a down hole drilling tool vertically uses a pendulum (36). The pendulum (36) controls flow from outlets (34) of drilling fluid chambers (30), providing drilling fluid to centralizer (24) activating pistons (26) acting upon centralizer blades (24). When the outer housing (12) deviates from a vertical orientation, the pendulum (36) swings by force of gravity to assume an angularly offset pivotal position. This adjusts the hydraulic pressure in one or two of the outlets (34) for one or two of the drilling fluid chambers (30) resulting in a change in the hydraulic force acting upon one or two of the pistons (26) causing one of the centralizers (24) to change their position to urge the outer housing (12) back toward the vertical position until the pendulum (36) again assumes the concentric pivotal position and the balanced pressure equilibrium in the drilling fluid chambers (30) is restored.

Un appareil (10) permettant de maintenir un outil de forage de fond de puits vertical utilise un pendule (36). Le pendule (36) commande le flux des sorties (34) des chambres (30) de fluide de forage, fournissant du fluide de forage à un centreur (24) activant des pistons (26) agissant sur des lames (24) de centreur. Lorsque le boîtier (12) externe dévie d'une orientation verticale, le pendule (36) balance sous l'effet de la gravité pour prendre une position de pivot décalée angulairement. Ceci règle la pression hydraulique dans une ou deux des sorties (34) pour une ou deux des chambres (30) de fluide de forage et provoque ainsi un changement dans la force hydraulique agissant sur un ou deux des pistons (26) provoquant un changement de position de l'un des centreurs (24) obligeant le boîtier externe (12) à revenir vers la position verticale, jusqu'à ce que le pendule (36) reprenne à nouveau la position de pivot concentrique et que l'équilibre de pression équilibrée dans les chambres (30) de fluide de forage soit restauré.

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