US 11,927,473 B2
Multi-fiber sensing topology for subsea wells
Glenn Wilson, Houston, TX (US); Mikko K. Jaaskelainen, Houston, TX (US); Kwang Il Suh, Houston, TX (US); John Laureto Maida, Houston, TX (US); Michel LeBlanc, Houston, TX (US); and Andreas Ellmauthaler, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on Jul. 19, 2022, as Appl. No. 17/867,961.
Prior Publication US 2024/0027258 A1, Jan. 25, 2024
Int. Cl. G01H 9/00 (2006.01); G01D 5/353 (2006.01); G01K 11/322 (2021.01); G01K 11/324 (2021.01); G01V 1/22 (2006.01); G01V 1/52 (2006.01); G01V 8/16 (2006.01)
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
OG exemplary drawing
 
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.