Methods and devices for treating multiple-interval well bores

E - Fixed Constructions – 21 – B

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E21B 34/14 (2006.01) E21B 33/124 (2006.01) E21B 33/127 (2006.01) E21B 43/26 (2006.01)

Patent

CA 2625662

Methods and devices are provided for treating multiple interval well bores. More particularly, an isolation assembly may be used to allow for zonal isolation to allow treatment of selected productive or previously producing intervals in multiple interval well bores. One example of a method for treating a multiple interval well bore includes the steps of: introducing an isolation assembly to a well bore, the isolation assembly comprising a liner, one or more sleeves and a plurality of swellable packers, wherein the sleeves and swellable packers are disposed about the liner; deploying a shifting tool inside the liner, where the sleeves are configured so as to provide open, closed and open to screen positions when actuated by the shifting tool. An open position allows for treatment of the well bore while an open to screen position allows for receiving fluid from the well bore. A closed position re- establishes zonal isolation.

Des méthodes et des dispositifs pour traiter des forages de puits à intervalles multiples. Plus particulièrement, un ensemble d'isolement peut être utilisé pour isoler les zones et permettre le traitement d'intervalles producteurs ou anciennement producteurs dans des forages de puits à intervalles multiples. Un exemple de méthode de traitement de forage de puits à intervalles multiples inclut les étapes suivantes : mise en place d'un ensemble d'isolement dans un forage de puits, cet ensemble comprenant un tubage, un ou plusieurs manchons et diverses garnitures gonflables, les manchons et les garnitures gonflables étant disposés le long du tubage; le déploiement d'un outil de commande dans le tubage, où les manchons sont configurés pour les positions ouverte, fermée et ouverte à fermée partiellement sous l'effet de l'outil de commande. Une position ouverte permet le traitement du puits alors qu'une position ouverte à fermée partiellement permet de recevoir du liquide du puits. La position fermée rétablit l'isolement des zones.

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