E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01)
Patent
CA 2195002
A drilling system for controlling steering of a downhole drilling tool (23) includes a shallow bend (28) in the drilling tool and a system (22) for rotating the bent drilling tool slowly about a longitudinal axis (24) of the drilling tool while the drill bit rotates more rapidly. The system further allows the slow rotation to be halted at a predetermined orientation of the bend axis (28) so as to effect a change in drilling direction. The system for rotating and halting this slow rotation comprises a downhole swivel coupling between the drilling tool (23) and the drill string (100) so that torque from the drill bit tends to rotate the drilling tool in the opposite direction. A control device is provided to restrict the amount of torque communicated through the swivel coupling and to halt the swivel coupling as required to control the steering of the drill bit.
Une installation de forage, qui permet de commander l'orientation d'un outil de forage (23), présente une légère courbure (28) propre à cet outil, et un dispositif (22) faisant tourner cet outil de forage courbe lentement autour de son axe longitudinal (24) alors que le trépan tourne plus rapidement. Ce dispositif permet aussi d'interrompre la rotation lente selon une orientation déterminée de l'axe courbe (28) pour modifier la direction de forage. Le dispositif qui permet cette rotation lente en son interruption comprend un couplage de forage à pivot placé entre l'outil de forage (23) et la colonne de forage (100), de façon que le couple opposé par le trépan tende à faire tourner l'outil de forage dans la direction opposée. Un dispositif de commande permet de limiter le couple transmis par l'intermédiare du couplage à pivot et d'interrompre la rotation de ce dernier pour commander l'orientation du trépan.
Emery Jamieson Llp
Halliburton Energy Services Inc.
Sidekick Tools Inc.
LandOfFree
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