Centralizers for oil well casings

Details Centralizers for oil well casings Centralizers for oil well casings

E - Fixed Constructions

21

B

E21B 17/10 (2006.01) E21B 23/00 (2006.01) E21B 29/02 (2006.01)

Patent

CA 2073332

A centralizer (4) for oil well casings has spring strips (12) which are normally bowed to centralize the casing (11) but which are held in a collapsed disposition against the casing while the casing is positioned in a borehole. The holding force may be provided by a band (14) and/or an arrangement of struts (18, 19). These ace released when the casing is positioned. An additional energizing device (23) may be provided to increase the bowing of the spring strips (12) for more certain engagement with the surrounding borehole.

Dispositif de centrage (4) pour tubage de puits de pétrole possédant des bandes ressort (12) qui sont normalement courbées de manière à centrer le tubage (11) mais qui sont en position contre le tubage lorsque ce dernier est mis en place dans un trou de forage. La force de retenue peut être fournie par une bague (14) et/ou une structure d'éléments de compression (18, 19). Ces dipositifs sont relâchés lorsque le tubage est en position. Il peut y avoir un dispositif supplémentaire d'amplification d'énergie (23) destiné à accroître la courbure des bandes ressort (12) pour une meilleure mise en place à l'intérieur du trou de forage.

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