Material sensitive downhole flow control device

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/08 (2006.01) E21B 23/04 (2006.01) E21B 34/14 (2006.01) E21B 43/08 (2006.01)

Patent

CA 2672754

A screen section (1) has a valve assembly to control flow through it. The valve is open and has a closure spring held compressed by a shape memory or swelling material (6) that responds to the presence of a specific well fluid or fluids so that its property changes to allow the spring (7) to deliver the stored potential energy to the valve member to close it when the specific well fluid or fluids are detected. The preferred material is a shape memory polymer that, for example, is sensitive to the presence of water or methane and gets softer to release the potential energy source to operate the downhole tool.

La présente invention concerne une partie de crépine comportant un ensemble clapet qui sert à réguler l'écoulement dans cette dernière. Le clapet est ouvert et comporte un ressort de fermeture maintenu comprimé par un matériau à mémoire de forme qui réagit à la présence d'au moins un fluide de puits spécifique de sorte que sa propriété change afin de permettre au ressort de libérer l'énergie potentielle stockée qui s'applique à l'élément de clapet pour le fermer lorsque le ou les fluides de puits spécifique(s) est/sont détectés. Le matériau préféré est un polymère à mémoire de forme qui, par exemple, est sensible à la présence d'eau ou de méthane et qui agit plus doucement pour libérer la source d'énergie potentielle servant à faire fonctionner l'outil de puits.

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