MONITORING USING DISTRIBUTED ACOUSTIC SENSING (DAS) TECHNOLOGY
First Claim
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1. A method, comprising:
- introducing optical pulses into a fiber optic cable disposed along a length of a conduit;
receiving acoustic signals that cause disturbances in the optical pulses propagating through the fiber optic cable; and
performing distributed acoustic sensing (DAS) along the length of the conduit by sensing the disturbances, such that the sensing produces the functional equivalent of a plurality of sensors along the length of the conduit.
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Abstract
Methods and systems are provided for performing acoustic sensing by utilizing distributed acoustic sensing (DAS) along a length of a conduit, such that the sensing is performed with the functional equivalent of tens, hundreds, or thousands of sensors. Utilizing DAS in this manner may cut down the time in performing acoustic sensing, which, therefore, may make acoustic sensing more practical and cost effective and may enable applications that were previously cost prohibitive with discrete acoustic sensors.
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Citations
20 Claims
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1. A method, comprising:
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introducing optical pulses into a fiber optic cable disposed along a length of a conduit; receiving acoustic signals that cause disturbances in the optical pulses propagating through the fiber optic cable; and performing distributed acoustic sensing (DAS) along the length of the conduit by sensing the disturbances, such that the sensing produces the functional equivalent of a plurality of sensors along the length of the conduit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system, comprising:
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a fiber optic cable disposed along a length of a first wellbore; an acoustic energy source disposed in a second wellbore for generating acoustic signals; and a control unit for performing distributed acoustic sensing (DAS) along the length of the first wellbore, wherein the control unit is configured to; introduce optical pulses into the fiber optic cable, wherein the acoustic signals cause disturbances in the optical pulses propagating through the fiber optic cable; and perform the DAS, such that the sensing produces the functional equivalent of a plurality of sensors along the length of the first wellbore. - View Dependent Claims (13, 14, 15, 16)
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17. A system, comprising:
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a fiber optic cable disposed at a surface of a wellbore; and a control unit for performing distributed acoustic sensing (DAS) at the surface of the wellbore, wherein the control unit is configured to; introduce optical pulses into the fiber optic cable, wherein acoustic signals cause disturbances in the optical pulses propagating through the fiber optic cable; and perform the DAS, such that the sensing produces the functional equivalent of a plurality of sensors at the surface of the wellbore. - View Dependent Claims (18, 19, 20)
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Specification