Casing circulator and method

E - Fixed Constructions – 21 – B

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E21B 33/00 (2006.01) E21B 19/00 (2006.01) E21B 21/01 (2006.01) E21B 21/10 (2006.01) E21B 23/00 (2006.01) E21B 33/127 (2006.01)

Patent

CA 2027211

Improved methods and apparatus are provided for sealing at the uppermost end of a casing string to provide circulation from adjacent the lower end of the casing string and into a well bore to enable the casing string to be more easily lowered into the well bore. A casing circulator is provided for lowering into the uppermost end of the casing string above the rig floor, and for sealing with an interior surface of the uppermost end of the casing string. An external sealing member of the casing circulator may be moved axially with respect to an inner packer tube, thereby allowing the sealing member to become inflated while also enabling fluid to pass through the casing circulator and into the casing string. The techniques of the present invention may also be used to fill the casing string as it is lowered into the well bore.

Méthodes et dispositif améliorés pour étanchéiser la partie supérieure d'une colonne de cuvelage et permettre une circulation entre le voisinage de la partie inférieure de la colonne de cuvelage et le trou de forage afin de faciliter la descente de la colonne de cuvelage à l'intérieur du trou de forage. Un circulateur est installé à la partie supérieure de la colonne de cuvelage, au-dessus du plancher de l'engin de forage, en montage étanche avec la surface intérieure de la partie supérieure de la colonne de cuvelage. Un élément étanche extérieur au circulateur de la colonne de cuvelage peut être déplacé axialement par rapport à une garniture interne; l'élément étanche peut donc être gonflé et continuer de permettre le passage du fluide à travers le circulateur et vers la colonne de cuvelage. Les techniques évoquées dans les présentes peuvent également être utilisées pour remplir la colonne de cuvelage lorsqu'elle est descendue dans le trou de forage.

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