E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 17/10 (2006.01)
Patent
CA 2749606
A non-rotating downhole sleeve adapted for casing centralization in a borehole. The sleeve includes a tubular body made of hard plastic with integrally formed helical blades positioned around its outer surface and an inner surface which allows drilling fluid to circulate to form a non-rotating fluid bearing between the sleeve and the casing. The tubular sleeve comprises a continuous non-hinged wall structure for surrounding the casing. The non-rotating centralizer sleeve reduces sliding and rotating torque at the surface while drilling the casing, for example, with minimal obstruction to drilling fluid passing between the casing and the surrounding borehole.
La présente invention concerne un manchon de fond de trou non rotatif pour le centrage de tubage dans un trou de forage. Le manchon comporte un corps tubulaire réalisé en plastique dur avec des lames hélicoïdales formées autour de sa surface extérieure et une surface intérieure qui permet la formation par la circulation de fluide de forage d'un palier fluide non rotatif entre le manchon et le tubage. Le manchon tubulaire comporte une structure de paroi continue non articulée pour entourer le tubage. Le manchon centreur non rotatif réduit le couple de glissement et de rotation à la surface lors du forage du tubage, par exemple, avec une obstruction minimale au passage de fluide de forage entre le tubage et le trou de forage autour.
Casassa Garrett C.
Mitchell Sarah B.
Moore Norman Bruce
Fetherstonhaugh & Co.
Wwt International Inc.
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