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Synchronization of distributed measurements in a borehole

  • US 9,007,231 B2
  • Filed: 01/17/2013
  • Issued: 04/14/2015
  • Est. Priority Date: 01/17/2013
  • Status: Active Grant
First Claim
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1. A system to synchronize distributed measurements in a borehole, the system comprising:

  • a plurality of wired segments coupled together by couplers;

    a plurality of nodes configured to measure, process, or relay information obtained in the borehole to a surface processing system, each of the plurality of nodes comprising a local clock and being disposed at one of the couplers or between couplers; and

    the surface processing system coupled to a master clock and configured to determine a time offset between the master clock and the local clock of an nth node among the plurality of nodes based on a downhole generated synchronization signal, wherein the surface processing system determines the time offset associated with the local clock of the nth node based on a subtracting a first value from a second value, the first value including the master clock time and the second value including a sum of components that include the local clock time of the nth node, an aggregate of a delay associated with every node from the surface processing system to the nth node, an aggregate of a delay associated with every wired segment from the surface processing system to the nth node, and an aggregate of a delay associated with every coupler from the surface processing system to the nth node.

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