Reducing noise in a distributed acoustic sensing system downhole
First Claim
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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Accused Products
Abstract
A distributed acoustic sensing system for use in a wellbore can include a shutter positioned between an amplifier and an optical-wave flow controller of the distributed acoustic sensing system for reducing optical noise in the distributed acoustic sensing system. The distributed acoustic sensing system can also include a controller operable to transmit a signal to the shutter to (i) open the shutter for allowing an optical pulse to transmit through the shutter, and (ii) close the shutter for preventing an extraneous optical waveform, that generates at least a portion of the optical noise, from transmitting through the shutter.
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Citations
20 Claims
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1. A distributed acoustic sensing system for use in a wellbore, the distributed acoustic sensing system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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an amplifier operable to receive an optical pulse from a pulser, increase a magnitude of the optical pulse, and transmit the optical pulse; a shutter for receiving the optical pulse and operable to (i) open for allowing the optical pulse to transmit through the shutter, and (ii) close for preventing an extraneous optical waveform that is output by the amplifier from transmitting through the shutter; and a controller communicatively coupled to the pulser and the shutter, the controller being operable to cause the shutter to open or close based on a time at which the pulser outputs the optical pulse. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A system comprising:
a shutter positioned in an interrogator of a distributed acoustic sensing system and operable to receive a signal from a controller for causing the shutter to (i) allow an optical pulse to transmit through the shutter, and (ii) prevent an extraneous optical waveform that is output by an amplifier of the interrogator from transmitting through the shutter. - View Dependent Claims (17, 18, 19, 20)
Specification