Method and apparatus for transmitting information between...

H - Electricity – 04 – B

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H04B 3/00 (2006.01) E21B 47/12 (2006.01) G01V 1/22 (2006.01) G01V 3/34 (2006.01) H04B 13/00 (2006.01)

Patent

CA 2078090

Information can be transmitted between equipment at the bottom of a drilling operation and the surface. A transceiver is provided at the surface, and is connected to both the earth, or the bottom of the ocean in an offshore operation, spaced from the drilling operation, and metal pipework used in the drilling operation. A transmitter receiver is used for applying and receiving electric signals between two points on the metal pipework. The two points are separated at a substantial distance along the metal pipework such that the resistance of the metal pipework connecting the two points is relatively low but greater than zero. No insulating junction is then needed to be interposed between the two points in the metal pipework connecting the two points. Preferably, the transmitter has upper and lower conductors with first and second polar ends at the two points, thus forming a dipole of substantial length across the metal pipework.

De l'information peut être transmise entre la surface et de l'équipement se trouvant au fond d'une installation de forage. Un émetteur-récepteur est installé à la surface et est relié à la terre, ou au fond marin, dans le cas d'un installation offshore, et se trouve à distance de l'installation de forage et de la tuyauterie métallique utilisée dans l'installation de forage. Un émetteur-récepteur est utilisé pour envoyer et recevoir des signaux électriques entre deux points de la tuyauterie métallique. Les deux points sont séparés par une distance substantielle le long de la tuyauterie métallique, de sorte que la résistance de la tuyauterie métallique connectant les deux points est relativement faible, mais supérieure à zéro. Aucune jonction isolante n'est requise entre les deux points de la tuyauterie métallique connectant les deux points. De préférence, le transmetteur comporte des conducteurs inférieur et supérieur avec une première et une deuxième extrémités polarisées aux deux points, formant ainsi un dipôle d'une longueur substantielle sur la longueur de la tuyauterie métallique.

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