US 11,732,578 B2
Topside interrogation for distributed acoustic sensing of subsea wells
Andreas Ellmauthaler, Houston, TX (US); John L. Maida, Jr., Houston, TX (US); Ira Jeffrey Bush, Los Angeles, CA (US); Michel Joseph LeBlanc, Houston, TX (US); and Glenn Andrew Wilson, Houston, TX (US)
Assigned to Halliburton Energy Services, Inc., Houston, TX (US)
Filed by Halliburton Energy Services, Inc., Houston, TX (US)
Filed on May 21, 2021, as Appl. No. 17/327,453.
Application 17/327,453 is a continuation of application No. 16/586,091, filed on Sep. 27, 2019, granted, now 11,047,230.
Claims priority of provisional application 62/849,025, filed on May 16, 2019.
Prior Publication US 2021/0270131 A1, Sep. 2, 2021
Int. Cl. E21B 47/16 (2006.01); E21B 49/00 (2006.01); G01D 5/353 (2006.01); G01V 1/18 (2006.01); G01V 1/52 (2006.01); E21B 47/135 (2012.01)
CPC E21B 49/00 (2013.01) [E21B 47/135 (2020.05); G01D 5/35306 (2013.01); G01V 1/18 (2013.01); G01V 1/52 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A distributed acoustic system (DAS) comprising:
an interrogator;
an umbilical line attached at one end to the interrogator comprising:
a first fiber optic cable;
a second fiber optic cable;
a proximal circulator disposed in the umbilical line and connected to the first fiber optic cable and the second fiber optic cable;
a distal circulator disposed in the umbilical line and connected to the first fiber optic cable and the second fiber optic cable; and
a Raman Pump disposed in the umbilical line and connected to the first fiber optic cable;
a downhole fiber attached to the umbilical line at the end opposite the interrogator; and
a light source disposed in the interrogator that is configured to emit a plurality of coherent light frequencies into the umbilical line and the downhole fiber.