Well monitoring by means of distributed sensing means
First Claim
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1. A method for downhole monitoring comprising:
- interrogating an unmodified optic fibre arranged along the path of a well bore to provide distributed acoustic sensing;
simultaneously sampling data gathered from a plurality of contiguous portions of said fibre; and
processing said data to determine one or more well bore parameters;
wherein processing said data includes detecting the response to an acoustic stimulus, andwherein said parameter is a well condition profile.
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Abstract
Methods and apparatus for downhole monitoring are provided by interrogating an unmodified optic fiber (102) arranged along the path of a well bore (106) to provide a distributed acoustic sensor and sampling data gathered from a plurality of contiguous sensing portions of the fiber. The sampled data is processed to determine one or more well bore parameters. The well bore parameters may comprise a well condition profile, and may be obtained in response to an acoustic stimulus.
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Citations
21 Claims
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1. A method for downhole monitoring comprising:
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interrogating an unmodified optic fibre arranged along the path of a well bore to provide distributed acoustic sensing; simultaneously sampling data gathered from a plurality of contiguous portions of said fibre; and processing said data to determine one or more well bore parameters; wherein processing said data includes detecting the response to an acoustic stimulus, and wherein said parameter is a well condition profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for downhole monitoring, said system comprising:
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a fibre optic interrogator adapted to provide distributed acoustic sensing on an unmodified fibre arranged along the path of a well bore; a sampler arranged to sample a plurality of channels output from said interrogator simultaneously to provide acoustic data from a plurality of contiguous portions of said fibre at each of a plurality of times; and a data analyser adapted to process said sampled data to detect well events and output parameters associated with detected events; wherein said data analyser is configured to detect the response to an acoustic stimulus, and determine a well condition profile. - View Dependent Claims (20, 21)
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Specification