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Abstract

Summary

Advances in precision engineered fibre (Constellation fibre) with brighter scatter centres and a new optoelectronic interrogator (Carina) offer a step-change in DAS performance, with 20dB (100x) lower noise floor compared to that achieved with standard fibre. This enables accurate measurement of the seismic velocity changes in the formation as well as monitoring minute ground motions (in picometer scale) and the gradual build-up of the low-frequency strain along the wellbore.

For long-term monitoring, we have also developed two new distributed sensing capabilities: (i) a Distributed Strain Sensor (DSS) based on measuring the frequency of Brillouin backscatter light with high accuracy and (ii) a novel optical “Fibre Ruler” that precisely measures the separation of scatter centres across different sections of the engineered fibre.

We also discuss how data from the different distributed sensing techniques can be integrated to evaluate the rock “R” factor or, as we propose here, the distributed Rock Index “RI”.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202131046
2021-03-01
2024-04-25

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202131046
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Keynote: Integrated Distributed Fibre Optic Sensing System for Reservoir and Subsidence Monitoring
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202131046
/content/papers/10.3997/2214-4609.202131046
/content/papers/10.3997/2214-4609.202131046
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