Well-treating method to prevent or cure lost-circulation

Details Well-treating method to prevent or cure lost-circulation Well-treating method to prevent or cure lost-circulation

E - Fixed Constructions

21

B

E21B 43/25 (2006.01) C09K 8/516 (2006.01)

Patent

CA 2523472

A method of preventing or treating lost circulation during the drilling of a well comprises the addition, at concentration ranging between about 0.5 and 6 pounds per barrel, of water-dispersible fibers having a length between about 10 and 25 mm, for instance glass or polymer fibers, to a pumped aqueous base- fluid including solid particles having an equivalent diameter of less than 300 µm. The base-fluid with the solid particles can be the drilling fluid or a small-volume pill specially pumped for curing lost circulation.

L'invention porte sur un procédé de prévention ou traitement des fuites de circulation lors du forage d'un puits comportant l'adjonction à raison d'environ 0,5 à 6 livres par baril de fibres hydrodispersibles par exemple de verre ou de polymère et d'une longueur comprise entre 20 et 25 mm, à un fluide pompé à base aqueuse comprenant des particules solides d'un diamètre équivalent de moins de 300 ?m. Ledit fluide de base contenant les particules peut être le fluide de forage ou un obturateur de faible volume spécialement pompé pour traiter les fuites de circulation.

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