E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/18 (2006.01)
Patent
CA 2692929
The present invention provides a method and system in which signals from the surface are sent by changing flow rate of the drilling fluid supplied to the drill string during drilling of a wellbore. The signals are sent based on a fixed or dynamic time period schemes so that the sent signals cross a dynamic threshold value in a known manner. A controller downhole sets the dynamic threshold and determines the number of times a parameter, such as voltage, relating to the changes in the flow rate crosses the set dynamic threshold. Based on the number of the number of crossings and/or the number of crossings and the timing of such crossings, the controller ascertains the signal sent from the surface for use downhole.
L'invention concerne un procédé et un système selon lesquels des signaux en provenance de la surface sont envoyés par modification du débit d'un fluide de forage amené dans un train de tiges de forage pendant le forage d'un puits. Les signaux sont envoyés en fonction de schémas de durée fixes ou dynamiques de façon que les signaux envoyés franchissent une valeur seuil de manière connue. Un contrôleur de fond de trou fixe la valeur seuil dynamique et détermine le nombre de fois qu'un paramètre, de type tension, associé aux modifications du débit franchit la valeur seuil fixée. En fonction du nombre de franchissements et/ou de la durée de ceux-ci, le contrôleur vérifie le signal en provenance de la surface afin de l'utiliser en fond de trou.
Doerge Henning
Kelch Thomas
Krueger Sven
Kurella Marc
Treviranus Joachim
Baker Hughes Incorporated
Sim & Mcburney
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