Patent ID: 11927473
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. 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 Fiber Bragg Gratings (FBG) interrogator unit;
a proximal circulator optically connected to the FBG interrogator unit;
a proximal wavelength division multiplexer (WDM) optically connected to the proximal circulator and the BOTDA interrogator unit;
a distal WDM optically connectable 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.