Baker Hughes Corporation

Marc Kurella

Joachim Treviranus

Henning Doerge

Sven Krueger

Thomas Kelch

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.

Method and apparatus for downlink communication using dynamic threshold values for detecting transmitted signals

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.

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Niedersachsen, Germany

Marc Kurella