Method and apparatus for cementing a well

E - Fixed Constructions – 21 – B

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Details

E21B 43/08 (2006.01) E21B 33/14 (2006.01) E21B 43/00 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2234386

A method of cementing a well permitting a reduction in the degree of diameter reduction of casing or liners required, and not requiring excessively large initial conductor casing, is described. The method is characterized by provision of an enlarged wellbore and a novel liner structure which is adapted for expansion of a reduced diameter section thereof downhole, providing, before expansion of the section, unimpeded flow of fluid from the enlarged wellbore during cementing and close fit of the expanded section with the casing or preceding liner, after cementing is completed and expansion of the section. A novel well liner structure and novel well liner expansion means are disclosed.

Description d'une méthode de cimentation des puits qui permet de diminuer la perte de diamètre du tubage ou des colonnes perdues nécessaire, et qui ne demande pas un tubage conducteur initial de très grand diamètre. La méthode se distingue par l'utilisation d'un trou de plus grand diamètre et d'une colonne perdue à configuration nouvelle qui convient à l'augmentation du faible diamètre d'une section de la colonne perdue au fond offrant, avant l'augmentation du diamètre de la section, un écoulement non entravé du fluide à partir du trou de diamètre plus grand pendant la cimentation et un ajustement serré de la section dont le diamètre a été augmenté avec le tubage ou la colonne perdue précédente, après que la cimentation et l'augmentation du diamètre de la section sont terminées. Sont également présentés une nouvelle configuration de la colonne perdue du puits et un nouveau dispositif utilisé pour augmenter le diamètre de la colonne perdue du puits.

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