Orientation sensor for downhole tool

Details Orientation sensor for downhole tool Orientation sensor for downhole tool

E - Fixed Constructions

21

B

E21B 17/10 (2006.01) E21B 47/024 (2006.01)

Patent

CA 2688329

A downhole drilling apparatus incorporating an orientation sensor (24) is disclosed. The orientation sensor is mounted to a housing (16) for providing a signal representing the orientation of the housing, and is connected to a first transceiver coil (26). A second transceiver coil (30) and a series of magnets (32) are mounted to a rotary shaft (18). As the shaft rotates relative to the housing, passage of the magnets past the first transceiver coil generates a voltage to provide electrical power to the sensor, and electromagnetic coupling between the first and second transceiver coils enables signals from the sensor to be transmitted to a measurement while drilling tool mounted on the rotary shaft.

L'invention concerne un appareil de forage équipé d'un capteur (24) d'orientation. Le capteur d'orientation est monté sur un logement (16) pour fournir un signal représentant l'orientation du logement, et est connecté à une première bobine (26) d'émission-réception. Une seconde bobine (30) d'émission-réception et une série d'aimants (32) sont montés sur un arbre rotatif (18). Tandis que l'arbre tourne par rapport au logement, le passage des aimants par la première bobine d'émission-réception génère une tension fournissant un courant électrique au capteur, et un couplage électromagnétique entre la première et la seconde bobine d'émission-réception permet aux signaux du capteur d'être transmis à un outil de forage MWD (measurement while drilling) monté sur l'arbre rotatif.

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