Improvements in or relating to downhole tools

Details Improvements in or relating to downhole tools Improvements in or relating to downhole tools

E - Fixed Constructions

21

B

E21B 17/10 (2006.01)

Patent

CA 2310009

A casing centraliser (3) for centralining a casing (75) in a wellbore (85), at least a portion of the casing centraliser being plastic or ceramic, cermet or submicron grained cemented carbide. Various arrangements of raised portions (30) on the outermost surface (20) of the casing centralizer(s) (5) are described together with an arrangement of recesses (110) on the innermost surfaces (25).

Cette invention a trait à un centreur de tubage (5) permettant de centrer un tubage de revêtement (75) dans un forage (85), une partie de ce centreur étant en matière plastique ou en céramique, en cermet ou en carbure fritté à grains d'échelle submicronique. L'invention porte également sur divers agencements de parties en saillie (30) de la face externe (20) du ou des centreurs de tubage (5) ainsi que sur des évidements (110) ménagés dans les faces internes (25).

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