Methods and apparatus for communicating across casing

E - Fixed Constructions – 21 – B

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E21B 47/00 (2006.01) H04B 5/00 (2006.01)

Patent

CA 2589148

A system for passing an electromagnetic signal through a casing comprises a tool body that can be positioned inside the casing; means for magnetically saturating the casing in the vicinity of the tool; a transmitter for transmitting an electromagnetic signal from the tool antenna to the outside of the casing for reception at one or more sensors equipped with an antenna and electronic circuits located outside the casing; and a detector for detecting an electromagnetic signal at the tool from the sensor located outside the casing.

Cette invention concerne un système servant à faire passer un signal électromagnétique à travers un tubage et comprenant cet effet un corps d'outil pouvant être placé à l'intérieur du tubage ; un moyen destiné à saturer le tubage en ondes magnétiques à proximité de l'outil ; un émetteur destiné à transmettre un signal électromagnétique de l'antenne de l'outil vers l'extérieur du tubage pour être reçu par un ou plusieurs capteurs pourvus d'une antenne et de circuits électroniques situés à l'extérieur du tubage ; et un détecteur servant à détecter un signal électromagnétique au niveau de l'outil en provenance du capteur situé à l'extérieur du tubage.

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