Downhole noise cancellation in mud-pulse telemetry

Details Downhole noise cancellation in mud-pulse telemetry Downhole noise cancellation in mud-pulse telemetry

E - Fixed Constructions

21

B

E21B 47/18 (2006.01)

Patent

CA 2664472

Pressure measurements are made using a pressure sensor in the proximity of the drillbit during drilling operations. A filtered version of the pressure measurements is provided to a pulser for a mud-pulse telemetry system so as to cancel pressure variations due to drilling noise while a telemetry signal is being sent.

Selon l'invention, des mesures de pression sont effectuées au moyen d'un capteur de pression à proximité du trépan pendant des opérations de forage. Une version filtrée des mesures de pression est fournie à un générateur d'impulsions dans un système de télémesure d'impulsions de boue de forage, de sorte à supprimer les variations de pression causées par le bruit de forage pendant l'envoi d'un signal de télémesure.

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