Improved downhole apparatus

Details Improved downhole apparatus Improved downhole apparatus

E - Fixed Constructions

21

B

E21B 34/10 (2006.01) E21B 23/04 (2006.01) E21B 23/06 (2006.01) E21B 33/127 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2245075

Downhole apparatus in the form of a valve (140) comprises a body (148) defining a bore (168) with a curved disc closure member (142) positioned in the bore. First and second retaining members (144, 146) are positioned on respective sides of the disc (142) for retaining the disc in a closed position and to hold pressure from both sides. One of the retaining members (144) is retractable to permit opening of the valve disc (142). The disc (142) may be locked closed by locking the retractable retaining member (144) in position. On release of the member (144), application of fluid pressure to portions of the member (144) will retract the member (144).

Dispositif de fond de puits se présentant sous la forme d'une soupape (140) et comprenant un corps (148) définissant un alésage (168) dans lequel est placé un élément de fermeture (142) sous forme de disque incurvé. Un premier et un deuxième élément de retenue (144, 146) sont placés sur les côtés respectifs du disque (142), afin de retenir ce dernier en position de fermeture et de maintenir la pression depuis les deux côtés. Un des éléments de retenue (144) est rétractable, de manière à permettre l'ouverture du disque (142) de la soupape. Ce disque (142) peut être maintenu en position de fermeture par verrouillage de l'élément de retenue rétractable (144) sur son emplacement. Lorsqu'on libère cet élément (144), la pression hydraulique exercée sur des parties dudit élément (144) escamote ce dernier.

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