CPC G01H 9/004 (2013.01) [G01D 5/35316 (2013.01); G01D 5/35364 (2013.01); G01D 5/35387 (2013.01); G01K 11/322 (2021.01); G01K 11/324 (2021.01); G01V 1/226 (2013.01); G01V 1/52 (2013.01); G01V 8/16 (2013.01); G01V 2210/1429 (2013.01)] | 20 Claims |
1. A fiber optic sensing (FOS) system comprising:
a Brillouin Optical Time Domain Analyzer (BOTDA) unit;
a first fiber optical cable optically connected to the BOTDA interrogator unit at a first end;
an optical feedthrough system (OFS) optically connected the first fiber optical cable at a second end of the first fiber optical cable;
a fiber optic cable forming a loop within a wellbore that is optically connected to the first fiber optical cable at the OFS; and
a second fiber optical cable optically connected to the loop at the OFS and wherein the second fiber optical cable is optically connected to the BOTDA interrogator unit;
a distributed acoustic sensing (DAS) interrogator unit;
a proximal circulator optically connected to the DAS interrogator unit;
a proximal wavelength division multiplexer (WDM) optically connected to the proximal circulator and the BOTDA interrogator unit;
a distal WDM optically connected to the proximal WDM by the first fiber optic cable;
a distal circulator optically connected to the distal WDM; and
one or more downhole sensing fibers optically connectable to the distal circulator at the OFS.
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