Drill string flow control valves and methods

E - Fixed Constructions – 21 – B

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E21B 21/10 (2006.01)

Patent

CA 2649910

Drill string flow control valves and more particularly, drill string flow control valves for prevention of u-tubing of fluid flow in drill strings are provided. Drill string flow control valves may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a biasing mechanism for biasing the valve sleeve into the closed position, and a plurality of pressure ports for allowing a differential pressure to be exerted on the valve sleeve. The differential pressure exerted on the valve sleeve may be the result of an upstream pressure and a downstream pressure. By allowing a differential pressure resulting from a fluid flow to act on the valve sleeve, u- tubing in a drill string can be prevented or substantially reduced. Methods of use are also provided.

La présente invention concerne des soupapes de commande de débit de tiges de forage et plus particulièrement, des soupapes de commande de débit de tiges de forage pour interdire un écoulement de fluide en forme de U dans les tiges de forage. Des soupapes de commande de débit de tiges de forage peuvent comporter un compartiment de soupape, un manchon de soupape axialement mobile au sein d'un compartiment de soupape depuis une position fermée vers une position ouverte, un mécanisme de sollicitation pour solliciter le manchon de soupape vers la position fermée, et une pluralité d'orifices de pression pour exercer une pression différentielle sur le manchon de soupape. La pression différentielle exercée sur le manchon de soupape peut être dérivée d'une pression amont et d'une pression aval. Grâce à l'application d'une pression différentielle dérivée d'un découlement de fluide agissant sur le manchon de soupape, il est possible d'interdire ou de réduire sensiblement un écoulement en forme de U dans un train de tiges de forage. L'invention concerne également des procédés d'utilisation.

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