Method for removing gravel pack screens

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 31/03 (2006.01) E21B 31/00 (2006.01) E21B 43/04 (2006.01)

Patent

CA 2499612

A method of removing a gravel packed screen to reach another zone is described. The method involves a bottom hole assembly comprising an isolation device for the screen and a tool to latch on to it. A perforating gun is shot off to put holes in the screen to allow gravel to come through. A flow through a reversing valve is initiated to urge the gravel into the newly perforated screen while a vibrator shakes the screen and stimulates gravel flow through the screen. Alternatively, the screen is not isolated and a reverse circulation from the surface in conjunction with vibration urges the gravel to flow through the screen and out through the tubing supporting the bottom hole assembly.

La présente invention se rapporte à un procédé de retrait d'une crépine entourée d'un massif de gravier pour atteindre une autre zone. Le procédé fait appel à un ensemble de fond de trou comportant un dispositif d'isolation pour la crépine et un outil conçu pour être verrouillé sur celle-ci. Un perforateur de tubage est déclenché pour pratiquer des trous dans la crépine de sorte que le gravier puisse passer à travers celle-ci. Un flux est déclenché à travers un distributeur d'inversion de sorte que le gravier est poussé vers la crépine récemment perforée tandis qu'un vibrateur fait vibrer la crépine et stimule l'écoulement du gravier à travers celle-ci. Il est également possible que la crépine ne soit pas isolée et qu'une circulation inversée à partir de la surface, associée à la vibration, fasse s'écouler le gravier à travers la crépine puis le fasse sortir à travers le tubage supportant l'ensemble de fond de trou.

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