Dual channel downhole telemetry

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/12 (2006.01) E21B 47/16 (2006.01) E21B 47/18 (2006.01) H04L 1/06 (2006.01)

Patent

CA 2476259

The present disclosure provides several methods for selecting and transmitting information from downhole using more than one channel of communication wherein data streams transmitted up each communications channel are each independently interpretable without reference to data provided up the other of the communications channels. Preferred embodiments incorporate the use of a combination of at least two of mud-based telemetry, tubular-based telemetry, and electromagnetic telemetry to achieve improved results and take advantage of opportunities presented by the differences between the different channels of communication.

L'invention concerne plusieurs procédés de sélection et d'émission d'informations à partir d'un sondage au moyen de plus d'un canal de communication, les flux de données émis dans chaque canal de communication étant chacun interprétable de façon indépendante sans prendre référence des données fournie par l'autre canal de communication. Dans des modes de réalisation préférés on utilise une combinaison d'au moins deux télémétries parmi la télémétrie basée concernant les boues, la télémétrie concernant les tubes et la télémétrie électromagnétique afin d'obtenir des résultats améliorés et de profiter des opportunités que présentent les différences entre les différents canaux de communication.

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