Method and apparatus for communicating signals from encased...

Details Method and apparatus for communicating signals from encased... Method and apparatus for communicating signals from encased...

G - Physics

01

V

G01V 3/34 (2006.01) E21B 47/12 (2006.01) G01V 1/22 (2006.01) H04B 7/00 (2006.01)

Patent

CA 2164342

A method and apparatus for wireless communicating of signals within an encased borehole (14) between a downhole tool (18) and the surface (11). The tool includes conductive upper and lower tool housings (21a, 21b) which are respectively in electric contact with the conductive borehole casing. Sensors (69) within the tool generate signals which are applied to a carrier signal. The modulated carrier signal is applied via the housings to the borehole casing. The carrier signal cause a reciprocating current to flow through the borehole casing (14a) between the tool housings, inducing a voltage potential on the outside of the well-casing, which forms a dipolar electromagnetic field (30) in the earth (12) which can be received at the surface.

Procédé et appareil permettant la communication sans fil de signaux, à l'intérieur d'un trou de forage (14) tubé, entre un outil situé au fond du trou (18) et la surface (11). L'outil comprend un boîtier d'outil conducteur supérieur et un boîter d'outil conducteur inférieur (21a, 21b) qui sont chacun en contact électrique avec le tubage conducteur du trou de forage. Des capteurs (69) contenus dans l'outil produisent des signaux qui sont appliqués à un signal porteur. Le signal porteur modulé est transmis au tubage du trou de forage par l'intermédiaire des boîtiers. Le signal modulé fait circuler un courant alternatif à travers le tubage (14a) du trou de forage entre les boîtiers d'outil, induisant ainsi un potentiel de tension sur l'extérieur du tubage du puits, ce qui crée dans la terre (12) un champ magnétique (30) dipolaire qui peut être capté à la surface.

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