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Reducing noise in a distributed acoustic sensing system downhole

  • US 10,309,825 B2
  • Filed: 04/07/2015
  • Issued: 06/04/2019
  • Est. Priority Date: 04/07/2015
  • Status: Active Grant
First Claim
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1. A distributed acoustic sensing system for use in a wellbore, the distributed acoustic sensing system comprising:

  • a pulser operable to receive a continuous optical waveform from an optical wave source and output an optical pulse;

    a shutter positioned between the pulser and an optical-wave flow controller of the distributed acoustic sensing system for reducing optical noise in the distributed acoustic sensing system; and

    a controller communicatively coupled to the pulser and the shutter, the controller being operable to control when the optical pulse is output by the pulser and correspondingly switch the shutter from (i) a closed configuration for preventing an extraneous optical waveform from transmitting through the shutter to (ii) an open configuration for allowing the optical pulse to transmit through the shutter, wherein the extraneous optical waveform generates at least part of the optical noise.

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