Borehole telemetry system

E - Fixed Constructions – 21 – B

Patent

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E21B 47/18 (2006.01)

Patent

CA 2520149

An acoustic telemetry apparatus and method for communicating encoded digital data from a down-hole location through a borehole to the surface is described including an acoustic channel terminated at a down-hole end by a reflecting terminal (133, 134), an acoustic wave generator (140) located at the surface and providing an acoustic wave carrier signal through said acoustic, channel, a modulator (162, 163) located down-hole to modulate amplitude and/or phase of said carrier wave in response to an encoded digital signal and one or more sensors (150) located at the surface adapted to detect amplitude and/or phase related information of acoustic waves traveling within said acoustic channel to determine the encoded digital data.

L'invention porte sur un appareil de télémétrie acoustique et sur un procédé permettant de communiquer, d'un fond de trou à la surface, par l'intermédiaire d'un trou de forage, des données numériques codées. L'appareil comprend un canal acoustique se terminant à une extrémité de fond de trou par une borne réfléchissante (133, 134), un générateur d'onde acoustique (140) situé à la surface et générant, par le canal acoustique, un signal de porteuse d'onde acoustique, un modulateur (162, 163) placé dans le fond de trou pour moduler l'amplitude et/ou la phase de l'onde porteuse en réponse à un signal numérique codé, et un ou plusieurs capteurs (150) placés à la surface et adaptés pour détecter les informations relatives à l'amplitude et/ou à la phase des ondes acoustiques se déplaçant dans le canal acoustique afin de déterminer le signal numérique codé.

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