Fiber optic cable for distributed acoustic sensing with increased acoustic sensitivity
First Claim
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1. A fiber optic cable suitable for use in distributed acoustic sensing (DAS), comprising:
- one or more optical fibers;
a tube surrounding the one or more optical fibers; and
a jacket surrounding the tube, wherein;
a cross-section of the jacket has a non-circular shape for at least a portion of the length of the jacket;
at least one of the one or more optical fibers has a smaller diameter compared to a standard optical fiber; and
upon application of pressures created by acoustic waves, the smaller diameter provides for increased response of the at least one of the one or more optical fibers compared to the standard optical fiber.
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Abstract
Methods and apparatus for performing Distributed Acoustic Sensing (DAS) using fiber optics with increased acoustic sensitivity are provided. Acoustic sensing of a wellbore, pipeline, or other conduit/tube based on DAS may have increased acoustic sensitivity through fiber optic cable design and/or increasing the Rayleigh backscatter property of a fiber'"'"'s optical core. Some embodiments may utilize a resonant sensor mechanism with a high Q coupled to the DAS device for increased acoustic sensitivity.
30 Citations
10 Claims
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1. A fiber optic cable suitable for use in distributed acoustic sensing (DAS), comprising:
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one or more optical fibers; a tube surrounding the one or more optical fibers; and a jacket surrounding the tube, wherein; a cross-section of the jacket has a non-circular shape for at least a portion of the length of the jacket; at least one of the one or more optical fibers has a smaller diameter compared to a standard optical fiber; and upon application of pressures created by acoustic waves, the smaller diameter provides for increased response of the at least one of the one or more optical fibers compared to the standard optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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providing a fiber optic cable disposed along a length of a conduit, wherein the fiber optic cable comprises; one or more optical fibers; a tube surrounding the one or more optical fibers; and a jacket surrounding the tube, wherein; a cross-section of the jacket has a non-circular shape for at least a portion of the length of the jacket; at least one of the one or more optical fibers has a smaller diameter compared to a standard optical fiber; and upon application of pressures created by acoustic waves, the smaller diameter provides for increased response of the at least one of the one or more optical fibers compared to the standard optical fiber; and performing distributed acoustic sensing (DAS) along the length of the conduit by receiving acoustic signals using the fiber optic cable.
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Specification