Method and apparatus for downlink communication

E - Fixed Constructions – 21 – B

Patent

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E21B 47/18 (2006.01)

Patent

CA 2601786

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 threshold value in a known manner. A detector measures the changes in the flow rate. A controller downhole determines the number of times a downhole parameter, such as voltage, relating to the changes in the flow rate crosses a predefined threshold value. Based on the number of the crossings and the timing of such crossings, signals are assigned to commands. The controller controls or operates a steering device based on the commands.

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 détecteur mesure les changements dans le débit. Un contrôleur de fond de trou détermine le nombre de fois qu'un paramètre de fond de trou, de type tension, associé aux changements dans le débit franchit une valeur seuil prédéfinie. En fonction du nombre de franchissements et de la durée de ceux-ci, les signaux sont attribués à des commandes. Le contrôleur commande ou active un dispositif d'orientation en fonction des commandes.

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