Distributed acoustic wave detection
First Claim
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1. An acoustic wave detection apparatus comprising:
- a fiber optic cable disposed along an elongate structure and configured to react to pressure changes resulting from a guided acoustic wave propagating along the elongate structure;
an optical source to launch an optical pulse into the fiber optic cable; and
a data acquisition system coupled to the fiber optic cable to detect coherent Rayleigh noise (CRN) produced in response to the optical pulse and to track propagation of the guided acoustic wave along the elongate structure based on the detected CRN, and where the data acquisition system is further configured to determine a location of the guided acoustic wave along the elongate structure based on the detected CRN.
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Abstract
A distributed acoustic wave detection system and method is provided. The system may include a fiber optic cable deployed in a well and configured to react to pressure changes resulting from a propagating acoustic wave and an optical source configured to launch interrogating pulses into the fiber optic cable. In addition, the system may include a receiver configured to detect coherent Rayleigh noise produced in response to the interrogating pulses. The CRN signal may be use to track the propagation of the acoustic wave in the well.
108 Citations
21 Claims
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1. An acoustic wave detection apparatus comprising:
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a fiber optic cable disposed along an elongate structure and configured to react to pressure changes resulting from a guided acoustic wave propagating along the elongate structure; an optical source to launch an optical pulse into the fiber optic cable; and a data acquisition system coupled to the fiber optic cable to detect coherent Rayleigh noise (CRN) produced in response to the optical pulse and to track propagation of the guided acoustic wave along the elongate structure based on the detected CRN, and where the data acquisition system is further configured to determine a location of the guided acoustic wave along the elongate structure based on the detected CRN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting acoustic wave propagation comprising:
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launching an optical signal into a fiber optic cable disposed along an elongate structure; generating a guided acoustic wave that propagates along the elongate structure; and analyzing a coherent Rayleigh noise (CRN) signal produced in response to the optical signal to track propagation of the guided acoustic wave along the elongate structure, wherein analyzing the CRN signal further comprises determining a location of the guided acoustic wave along the elongate structure. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A system comprising:
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an optical fiber for deployment in a wellbore; an acoustic source to generate a guided acoustic wave to propagate along the wellbore; an optical source to launch an optical signal into the optical fiber to produce a backscattered signal while the guided acoustic wave is propagating along the wellbore; a receiver to detect coherent Rayleigh noise (CRN) in the backscattered signal a processing circuit to process the CRN to monitor propagation of the acoustic wave along the wellbore, wherein the processing circuit is configured to process the CRN to determine a location of the guided acoustic wave. - View Dependent Claims (18, 19, 20, 21)
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Specification