Drilling assembly with a steering device for coiled-tubing...

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/06 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2279338

The present invention provides a coiled tubing conveyed drilling assembly for drilling deviated wellbores. The drilling assembly includes a drill bit at the lower end of the drilling assembly. A drilling motor provides the rotary power to the drill bit. A bearing assembly of the drilling motor provides lateral and axial support to the drill shaft connected to the drill bit. A steering device is integrated into drilling motor assembly. The steering device contains a plurality of force application members disposed at an outer surface of the drilling motor assembly. Each force application member is adapted to move between a normal position and a radially extended position to exert force on the wellbore interior when in extended position. A power unit in the housing provides pressurized fluid to the force application members. A control device for independently operating each of the force application members is disposed in the drilling motor assembly. A control circuit or unit independently controls the operation of the control device to independently control each force application member. For short radius drilling, a knuckle joint is disposed uphole of the steering device to provide a bend in the drilling assembly. During drilling of a wellbore, the force application members are operated to adjust the force on the wellbore to drill the wellbore in the desired direction.

L'invention concerne un ensemble de forage pour réaliser des forages déviés. L'ensemble de forage comporte un trépan (50) placé à son extrémité inférieure. Un moteur (10) de forage confère le pouvoir de rotation au trépan. Un ensemble support (20) du moteur de forage assure un support latéral et axial à l'arbre (28) de forage relié au trépan. Un dispositif de guidage (30) est intégré dans l'ensemble moteur de forage. Le dispositif de guidage contient une pluralité d'éléments (32) applicateurs de force disposés sur une face externe de l'ensemble moteur de forage. Chaque élément applicateur de force peut être déplacé entre une position normale et une position d'extension radiale, de manière à exercer une force sur l'intérieur du puits de forage (38) lorsqu'il se trouve en position d'extension. Un bloc d'alimentation (40) situé dans le boîtier fournit un liquide sous pression aux éléments d'application de force. Un dispositif de commande (33) permettant d'actionner de manière indépendante chacun des éléments applicateurs de force est disposé dans l'ensemble moteur de forage. Un circuit ou une unité de commande (80) pilote de façon indépendante le fonctionnement du dispositif de commande afin de commander séparément chaque élément applicateur de force. Pour le forage à rayon court, un joint à rotule (60) est placé en amont du dispositif de guidage pour imprimer un coude à l'ensemble de forage. Pendant le forage d'un puits, les éléments applicateurs de force sont actionnés de manière à ajuster la force exercée sur le puits afin de forer le puits dans la direction désirée.

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