A friction reducing tool

E - Fixed Constructions – 21 – B

Patent

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E21B 17/10 (2006.01)

Patent

CA 2309615

A centraliser having a first group of rollers (5) for reducing friction between the centraliser and an oil field tubular (7) and a second group of rollers (4) for reducing friction between the centraliser and the wall of a well. The axles of the first group of rollers (5) are generally aligned with the axis of the bore (2) to reduce rotational friction. The axles of the rollers of the second group of rollers (4) are generally transversed to the bone (2). The arrangement reduces rotational and axial drag between an oil field tubular (7) and the walls of a well, particularly when initiating rotation of an oil field tubular.

L'invention concerne un centreur présentant une première série de galets (5) pour réduire le frottement entre le centreur et un matériel tubulaire (7) d'un champ pétrolifère, et une deuxième série de galets (4) pour réduire le frottement entre le centreur et la paroi d'un puits. Les axes de la première série de galets (5) sont généralement alignés sur l'axe du forage (2) pour réduire le frottement rotationnel. Les axes de la deuxième série de galets (4) sont généralement transversaux par rapport au forage (2). Cet arrangement réduit la résistance rotationnelle et axiale entre un matériel tubulaire (7) d'un champ pétrolifère et les parois d'un puits, notamment à l'entame de la rotation dudit matériel tubulaire.

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