Technique for signal detection using adaptive filtering in...

Details Technique for signal detection using adaptive filtering in... Technique for signal detection using adaptive filtering in...

G - Physics

01

V

G01V 1/40 (2006.01) B21B 47/00 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2394076

a mud pulse telemetry adaptive noise canceller (ANC) is provided to provide information on down hole conditions during a Measurement-While-Drilling/Logging-While-Drilling (MWD/LWD) operation. The ANC (181) employs a Signal Conditioning Box (175), Anti-Abasing Filter (177) and two transducers, each receiving a succession of signals due to a transmission device~ (158). A primary transducer (163), located downhole from both a mud pump (151) and a desurger, receives a primary signal. A reference transducer (165), located near the mud pump (151) and upstream from the desurger (153), receives a reference signal. The ANC linearly relates the reference signal to the primary signal by means of a recursive least squares algorithm and calculates weighting coefficients. The ANC (181) uses weighing coefficients to process a subsequent primary signal, thus enhancing transmission of MWD and/or LWD data thru a downhole drillpipe (157) via the medium of Mud Flow (155).

L'invention concerne un annuleur de bruits adaptatif dans une unité de télémesure par impulsions dans la boue (ANC) utilisé afin de fournir des informations sur les conditions du fond de trou pendant une opération de Mesure-Pendant-Forage/Diagraphie-Pendant-Forage (MWD/LWD). L'ANC met en oeuvre deux transducteurs, chacun recevant une succession de signaux. Un premier transducteur, situé au fond du trou à partir d'une pompe à boue et d'un amortisseur de pulsations, reçoit un premier signal. Un transducteur de référence, situé près de la pompe à boue et en amont de l'amortisseur de pulsations, reçoit un signal de référence. L'ANC associe de manière linéaire le signal de référence au signal primaire au moyen d'un algorithme récursif des moindres carrés et calcule les coefficients de pondération. L'ANC utilise ces coefficients afin de traiter un signal primaire subséquent, améliorant ainsi la transmission de données MWD/LWD.

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