A surface controlled wellbore directional steering tool

Details A surface controlled wellbore directional steering tool A surface controlled wellbore directional steering tool

E - Fixed Constructions

21

B

E21B 7/06 (2006.01) E21B 7/10 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2217056

A tool for controlling azimuth and/or inclination in a wellbore and methods for utilizing the same is disclosed. The tool generally comprises a freely rotating mandrel, for transmitting drilling forces, contained within two eccentric sleeves. The outer sleeve has an eccentric longitudinal bore that forms a pregnant or weighted side that seeks the lowside of the wellbore. Two gauge inserts or stabilizer shoes are provided on either side of the outer sleeve at ninety degrees to the pregnant housing. The inner sleeve has a further eccentric longitudinal bore that contains the freely rotating mandrel. The mandrel is attached to the drill string at one end and to the drilling bit at the other. The position of the inner sleeve may be controlled, at will from the surface, so that the eccentric is kept to one side of the outer housing, thus transmitting a fulcrum force to the bit and controlling the azimuth and/or inclination of the wellbore. The pregnant housing contains drive means and assorted logic for controlling the position with respect to the pregnant housing of the eccentric bore of the inner sleeve.

L'invention porte sur un instrument permettant d'agir sur l'azimut et/ou l'inclinaison dans un forage de puits ainsi que sur les procédés d'utilisation. Cet instrument comprend, d'une manière générale, un arbre à rotation libre (11), destiné à transmettre des forces destinées au forage, se trouvant à l'intérieur de deux manchons excentriques (12, 13). Le manchon extérieur (13) possède un alésage longitudinal excentrique constituant un coté bombé ou lesté (20) qui cherche le coté inférieur du forage. Deux pièces rapportées servant de jauge d'écartement ou sabots stabilisateurs (21) sont ménagées de chaque coté du manchon extérieur (13) perpendiculairement au carter bombé (20). Le manchon intérieur (12) possède un autre alésage longitudinal excentrique contenant l'arbre à rotation libre (11). Celui-ci est fixé au train de forage sur une extrémité et au trépan sur l'autre. Il est possible de commander à volonté depuis la surface la position du manchon intérieur (12), afin de maintenir l'excentrique sur un coté du carter extérieur (13), transmettant ainsi une force d'appui au trépan et agissant sur l'azimut et/ou l'inclinaison du forage. Le carter bombé (20) contient des organes d'entraînement ou une logique assortie permettant de commander la position de l'alésage excentrique du manchon intérieur (12) relative au carter bombé (20).

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