A downhole telemetry system

Details A downhole telemetry system A downhole telemetry system

G - Physics

01

V

G01V 3/30 (2006.01) H01Q 1/04 (2006.01) E21B 47/12 (2006.01)

Patent

CA 2676071

An EM antenna for location on a pipe (10) surrounded by a casing (12).The antenna has a power source (21) for injecting a current across a first insulated section (25) of the pipe (10) and an electrode (22) for conducting the current from the pipe (10) to the casing (12). There is also a second insulated section (23) of the pipe arranged to operate together with the electrode (22) and first insulated section (25) for directing a path flow of the current. Such antennas are described both in relation to repeater arrangements as well as land and sea applications.

L'invention concerne une antenne EM destinée à être placée sur un tuyau (10) entouré d'un cuvelage (12). L'antenne possède une source d'alimentation (21) permettant d'injecter un courant de part et d'autre d'une première section isolée (25) du tuyau (10) et une électrode (22) permettant d'acheminer le courant du tuyau (10) au cuvelage (12). On trouve également une seconde section isolée (23) du tuyau conçue pour fonctionner avec l'électrode (22), la première section isolée (25) permettant de diriger un flux du courant. De telles antennes sont décrites à la fois pour des configurations de répéteur et des applications terrestres et maritimes.

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