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System and method for controlling a downhole tool

  • US 9,488,045 B2
  • Filed: 03/20/2014
  • Issued: 11/08/2016
  • Est. Priority Date: 03/20/2013
  • Status: Active Grant
First Claim
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1. A system for downhole communication, comprising:

  • a downhole tool comprising;

    a downlink receiver to receive control information that controls operation of the downhole tool, the control information encoded in rotation of the downhole tool, the downlink receiver comprising;

    a rotation sensor configured to sense rotation of the downhole tool about a longitudinal axis of the downhole tool; and

    a decoder configured to;

    demarcate fields of the control information based on rotation state transitions sensed by the rotation sensor, wherein the rotation state transitions are transitions between a rotating state and a non-rotating state of the downhole tool, wherein in the non-rotating state the downhole tool is rotated at approximately zero revolutions per minute; and

    decode a control value for controlling the downhole tool based on a duration of a field of the control information, wherein the control value is wholly encoded in the field and the field is encoded as a non-rotating state of the downhole tool; and

    a command actuator that applies the control value to control operation of the downhole tool.

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