Open hole non-rotating sleeve and assembly

E - Fixed Constructions – 21 – B

Patent

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E21B 17/10 (2006.01)

Patent

CA 2749602

A non-rotating downhole sleeve adapted for open hole drilling and/or casing cen-tralization. The sleeve includes a tubular body made of hard plastic with integrally formed heli-cal blades positioned around its outer surface and an inner surface configuration which allows drilling fluid circulation to form a non-rotating fluid bearing between the sleeve and the drill pipe or casing. The helical blades reduce sliding and rotating torque while drilling, with minimal obstruction to drilling fluid passing through the borehole between the blades. In one embodi-ment, improvements are provided during casing exit when drilling in open hole environments. In another embodiment, improvements are provid-ed in the sleeve's resistance to compressive load-ing.

La présente invention concerne un manchon non rotatif adapté pour le forage à trou découvert et/ou le centrage du tubage. Le manchon comporte un corps tubulaire réalisé en plastique dur, qui présente des lames hélicoïdales faisant corps avec lui, positionnées autour de sa surface extérieure, ainsi qu'une configuration de surface intérieure qui permet la formation, par circulation de fluide de forage, d'un palier fluidique non rotatif entre le manchon et la tige de forage ou le tubage. Les lames hélicoïdales réduisent le couple de glissement et de rotation lors du forage, avec une obstruction minimale au passage de fluide de forage à travers le trou de forage entre les lames. Selon un mode de réalisation, des améliorations sont apportées pendant le retrait du tubage lors de forage dans des environnements à trou découvert. Selon un autre mode de réalisation, des améliorations sont apportées à la résistance du manchon à la charge de compression.

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