E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/16 (2006.01)
Patent
CA 2463262
The present invention is a method of transmitting one or more acoustic signals in a drill string using PSK, ASK, FSK or MSFK. The method includes determining one or more stopbands and one or more passbands by testing or modeling the drill string. Two modulating frequencies are selected that are equidistant about a carrier frequency, and which are located within at least one passband. Data representative of downhole measurements or calculations are converted to signals to be transmitted at the modulating frequencies.
L'invention concerne un procédé servant à transmettre un ou plusieurs signaux acoustiques dans un train de tiges mettant en application PSK, ASK, FSK ou MSFK. Ce procédé consiste à déterminer une ou plusieurs bandes affaiblies et une ou plusieurs bandes passantes par essai ou modélisation du train de tiges. On sélectionne deux fréquences de modulation équidistantes par rapport à une fréquence de porteuse et situées à l'intérieur d'au moins une bande passante. On convertit les données représentant des calculs ou des mesures de fond de puits en signaux devant être transmis aux fréquences de modulation.
Baker Hughes Incorporated
Sim & Mcburney
LandOfFree
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