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1. (WO2015047646) FIBER OPTIC DISTRIBUTED ACOUSTIC MEASUREMENTS VIA FMCW INTERROGATION

Pub. No.:    WO/2015/047646    International Application No.:    PCT/US2014/053044
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Fri Aug 29 01:59:59 CEST 2014
IPC: E21B 47/00
G01V 1/40
G01V 1/48
Applicants: BAKER HUGHES INCORPORATED
Inventors: RAUM, Matthew Thomas
DUNCAN, Roger Glen
CHILDERS, Brooks A.
Title: FIBER OPTIC DISTRIBUTED ACOUSTIC MEASUREMENTS VIA FMCW INTERROGATION
Abstract:
A system and method to obtain acoustic information from a borehole penetrating the earth are described. The system includes a light source to provide a continuous output beam and a modulator to modulate the continuous output beam with a modulation signal to provide a frequency modulated continuous wave (FMCW) to be sent out on an optical fiber disposed along the borehole, the optical fiber including a plurality of reflectors at known locations along the optical fiber. The system also includes a processor to process a light reflection signal from the optical fiber to determine the acoustic information.