Apparatus and method for reverse circulation cementing a...

E - Fixed Constructions – 21 – B

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E21B 33/05 (2006.01) E21B 33/04 (2006.01) E21B 33/14 (2006.01)

Patent

CA 2591038

The present invention is directed to an apparatus and method for reverse circulation cementing a casing in an open-hole wellbore. The apparatus includes a surface pack-off device, which has a housing defined by an upper section and lower section. A load bearing plate is secured to the housing between the upper and lower sections. The load plate and lower section of the housing cooperate to prevent sloughing of the earth at the surface of the wellbore via a section of casing string. The surface pack-off device also includes a casing hanger, which couples to the casing in the wellbore. Fluid inlets allow the cement to be pumped into the wellbore in the annulus formed between the casing and wellbore sidewall. The method includes the steps of installing the surface pack-off device and operation on reverse circulation of the cement down the annulus.

La présente invention concerne un appareil et procédé pour cimenter un tubage par circulation inverse dans un sondage découvert. L'appareil comprend un dispositif porte-garnitures complet de surface, qui comporte un logement défini par une section supérieure et une section inférieure. Une plaque porteuse de charge est fixée au logement entre les sections supérieure et inférieure. La plaque de charge et la section inférieure du logement coopèrent pour empêcher l'éboulement de la terre à la surface du sondage par l'intermédiaire d'une section de colonne de tubage. Le dispositif porte-garnitures complet de surface comprend également une suspension de tubage, qui s'accouple au tubage dans le sondage. Des entrées de fluide permettent au ciment d'être pompé dans le sondage dans l'espace annulaire formé entre le tubage et la paroi latérale du sondage. Le procédé comprend l'installation du dispositif porte-garnitures complet de surface et la circulation inverse du ciment vers le bas de l'espace annulaire.

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