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Downlinking communication system and method

  • US 8,570,833 B2
  • Filed: 05/24/2010
  • Issued: 10/29/2013
  • Est. Priority Date: 05/24/2010
  • Status: Active Grant
First Claim
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1. A method for transmitting a command from a surface location to a bottom hole assembly located in a borehole, the method comprising:

  • (a) pumping drilling fluid downhole through a drill string to the bottom hole assembly;

    (b) changing a flow rate of the drilling fluid to encode a downlinking signal, the downlinking signal including at least a synchronization phase and a command phase, each of the synchronization phase and the command phase including at least one distinct pulse;

    (c) detecting the downlinking signal at the bottom hole assembly;

    (d) decoding the synchronization phase to determine at least one of a bit length and a pulse level of the command phase; and

    (e) decoding the command phase to determine the command based on the bit length and the pulse level determined in (d).

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