Centralizer

Details Centralizer Centralizer

E - Fixed Constructions

21

B

E21B 17/10 (2006.01)

Patent

CA 2091547

A centralizer for downhole sucker rods such as those used in oil wells. The centralizer has a central axial aperture for rotatable mounting on a downhole rod of a rod string. The exterior surface of the centralizer is shaped to engage the well wall when brought into contact with the wall such that rotational movement of the centralizer is limited or stopped with respect to the wall. Generally, the exterior of the centralizer is shaped to match the shape of the wall of the well in which it is to be used. A centralizer for use with a well lined with a circular tubing thus has at least one exterior surface which in cross section defines an arc having a radius of curvature equal to that of the tubing interior. A disclosed embodiment has six lobes having surfaces defining in cross section portions of three such arcs arranged symmetrically about the central aperture.

Centreur de tiges pour tiges de pompage régulières utilisées dans le forage de puits de pétrole. Le centreur comporte un passage axial permettant le montage d'un train de tiges rotatives. La surface extérieure du centreur est formée de manière à s'adapter à la paroi du puits, ce qui limite ou interdit les mouvement de rotation du centreur par rapport au puits. D'une manière générale, la forme extérieure donnée au centreur correspond à la forme du puits auquel son utilisation est destinée. Un centreur destiné à être utilisé dans un puits tubé doit donc définir un arc dont le rayon de courbure est égal aux dimensions intérieures du tubage. Dans la version proposée, le centreur comporte six lobes définissant la section transversale de trois arcs inscrits symétriquement dans le passage central.

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