A method for a valve, a valve and a wireline core drilling...

E - Fixed Constructions – 21 – B

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Details

E21B 25/00 (2006.01) E21B 21/10 (2006.01) E21B 25/02 (2006.01)

Patent

CA 2381487

The present invention relates to a method for a valve, which valve comprises a movable valve body (6) having a first side (9) facing a means for supplying pressurised fluid and influenced in the supply direction by a force from said fluid, and a second side (11) infuenced in opposite direction by a force from said fluid, which valve is provided with at least one connection (8) connecting the first side (9) of the valve body with the second side (11) of the valve body, and also comprising a spring (20) for opening the valve by displacing the valve body from a closed position to an open position, said method comprising the following steps: a pressurised fluid is supplied to the valve in closed position so that the valve remains closed; the supply of pressurised fluid to the closed valve ceases, a force equalisation than occurs between said first (9) and second (11) sides thereby enabling the spring to open the valve, and a pressurised fluid is supplied to the valve in open position and the valve remains open. The invention also relates to a valve for performing the method and to a system for wire line core drilling including such a valve.

L'invention porte sur un procédé relatif à une soupape comportant un corps mobile (6) dont un premier côté fait face à un moyen d'adduction d'un fluide sous pression et influencé sans le sens de l'alimentation par la force exercée par ce même fluide, et dont un deuxième côté (11) est influencé dans le sens opposé par la force exercée par ce même fluide. Ladite soupape qui présente au moins un passage (8) reliant le premier côté (9) de son corps au deuxième (11), est par ailleurs munie d'un ressort (20) ouvrant la soupape en en déplaçant le corps d'une position de fermeture à une position d'ouverture. Ledit procédé comprend les étapes suivantes: fourniture à la soupape en position de fermeture d'un fluide sous pression qui la maintient fermée; coupure de l'alimentation en fluide de la soupape produisant une égalisation entre son premier (9) côté et son deuxième (11) côté, ce qui permet au ressort d'ouvrir la soupape, tandis qu'un fluide sous pression alimentant la soupape en position d'ouverture la maintient ouverte. L'invention porte également sur une soupape permettant de réaliser ledit procédé, et sur un système de carottage la comprenant.

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