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Drill string rotation encoding

  • US 20050001737A1
  • Filed: 07/01/2004
  • Published: 01/06/2005
  • Est. Priority Date: 07/01/2003
  • Status: Active Grant
First Claim
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1. A method for communicating with a downhole device deployed in a subterranean borehole, the method comprising:

  • (a) deploying a downhole device in a subterranean borehole, the device being coupled to a drill string, the drill string being rotatable about a longitudinal axis, the device including a measurement device operative to measure rotation rates of the drill string about the longitudinal axis;

    (b) predefining an encoding language comprising codes understandable to the downhole device, the codes represented in said language as predefined value combinations of drill string rotation variables, said variables including rotation rate;

    (c) causing the drill string to rotate at substantially a preselected first rotation rate;

    (d) causing the drill string to rotate at substantially a preselected second rotation rate;

    (e) causing the measurement device to measure the first and second rotation rates; and

    (f) processing downhole the first rotation rate measured in (e) in combination with the second rotation rate measured in (e) to acquire at least one code in said language at the downhole device.

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