Flow monitoring using fibre optic distributed acoustic sensors
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United States of America Patent
Stats
-
Nov 28, 2017
Grant Date -
Aug 7, 2014
app pub date -
Sep 28, 2012
filing date -
Sep 29, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
This application describes methods and apparatus for monitoring flow of fluids within conduits using fiber optic Distributed Acoustic Sensing (DAS). The method can determine flow rate and/or flow regime within a conduit such as within a production well or a pipeline. Embodiments involve introducing an acoustic stimulus (802) into the fluid within the conduit (801); interrogating an optical fiber (104) deployed along the path of the conduit to provide a DAS sensor; and analyzing the acoustic signals detected by a plurality of channels of the DAS sensor to determine at least one flow characteristic. Analyzing the acoustic signal comprises identifying reflections (804) of said acoustic stimulus caused by the fluid within the conduit and analyzing said reflections to determine any Doppler shift (Δf).
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Cited Art Landscape
Patent Citation Ranking
- 3 Citation Count
- E21B Class
- 11.26 % this patent is cited more than
- 8 Age
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| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | May 28, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | May 28, 2029 |
