Patent ID: 11933664
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Measurement (Instruments)
Classification: CPC G  E  H | IPC E  G  H

Claim 0:
1. A distributed acoustic sensing (DAS) system comprising:
an interrogator;
a proximal circulator connected to the interrogator by a first fiber optic cable;
a distal circulator connected to the proximal circulator by a second fiber optic cable and a third fiber optic cable;
first amplifier disposed on the second fiber optic cable between the proximal circulator and the distal circulator;
a second amplifier disposed on the third fiber optic cable between the proximal circulator and the distal circulator;
a fifth fiber optic cable connecting the first amplifier to the second amplifier;
a pump laser connected to the first amplifier by a fourth fiber optic cable; and
a downhole fiber connected to the distal circulator.