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 |
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.
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