Flow actuated valve for use in a wellbore

E - Fixed Constructions – 21 – B

Patent

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E21B 21/10 (2006.01)

Patent

CA 2468899

The present invention generally relates to a flow-actuated valve for use in a wellbore. The invention includes a body having a closing member (127) and a seat (109). The closing member and seat are separable to open and close the valve, thereby allowing the flow of fluid through the valve. The invention further includes a retainer (205) to initially retain the valve in the open position absent a predetermined fluid flow rate in a first direction for a predetermined time period. A biasing member (140) thereafter urges the valve to the closed position, absent another fluid flow rate in the first direction.

De manière générale, la présente invention concerne une vanne à actionnement par écoulement utilisée dans un puits de forage. L'invention comprend un corps muni d'un élément de fermeture (127) et d'un siège (109). L'élément de fermeture et le siège peuvent être séparés en vue d'une ouverture et d'une fermeture de la vanne, le fluide pouvant ainsi s'écouler à travers cette vanne. L'invention concerne également un élément de retenue (205) permettant de retenir initialement la vanne en position ouverte en l'absence d'un débit de fluide prédéterminé dans un premier sens pendant une période prédéterminée. Un élément de sollicitation (140) pousse la vanne en position fermée en l'absence d'un autre débit de fluide dans le premier sens.

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