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1. (WO2018044317) DETECTING CHANGES IN AN ENVIRONMENTAL CONDITION ALONG A WELLBORE

Pub. No.:    WO/2018/044317    International Application No.:    PCT/US2016/050076
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Sep 03 01:59:59 CEST 2016
IPC: E21B 47/00
G01V 8/02
E21B 47/06
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: LEBLANC, Michel Joseph
NITSCHE, Wolfgang Hartmut
SIERRA, Jose R.
MARTINEZ, Yenny Natali
MAIDA, John Laureto
BARFOOT, David Andrew
Title: DETECTING CHANGES IN AN ENVIRONMENTAL CONDITION ALONG A WELLBORE
Abstract:
A method and system can include positioning an optical waveguide along a wellbore, and launching one or more optical signals into the waveguide at one or more optical signal frequencies and during one or more time periods, thereby resulting in one or more backscattered signals being received by the receiver, which produces a trace for each of the one of more backscattered signals. Changing an environmental condition in the wellbore, generating additional backscattered light signals at one or more frequencies after the change. Comparing the traces generated before the condition change to those generated after the change, identifying a before trace and an after trace that are substantially equal to each other and identifying a frequency difference between these traces. The frequency difference can be used to determine the amount of change in the environmental condition that occurred when the environmental change event happened.