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1. (WO2018039466) ELECTROMAGNETIC WAVE PROPAGATION MEASUREMENT WITHOUT SYNCHRONIZATION

Pub. No.:    WO/2018/039466    International Application No.:    PCT/US2017/048439
Publication Date: Fri Mar 02 00:59:59 CET 2018 International Filing Date: Fri Aug 25 01:59:59 CEST 2017
IPC: G01N 29/11
G01N 29/07
G01N 29/44
E21B 49/00
Applicants: BAKER HUGHES, A GE COMPANY, LLC
Inventors: HARTMANN, Andreas
FANG, Sheng
Title: ELECTROMAGNETIC WAVE PROPAGATION MEASUREMENT WITHOUT SYNCHRONIZATION
Abstract:
Methods and apparatus for determining at least one parameter of interest of an earth formation. Methods include using at least one transmitter to initiate at a single location in the formation a first electromagnetic signal at a first frequency and a second electromagnetic signal at a second frequency different than the first frequency for propagation through the formation; receiving the first electromagnetic signal propagating through the formation and the second electromagnetic signal propagating through the formation at a single receiver non-collocated with the at least one transmitter; estimating a relative phase shift of the second electromagnetic signal relative to the first electromagnetic signal; estimating a relative attenuation of the second electromagnetic signal relative to the first electromagnetic signal; using the relative attenuation and the relative phase shift to estimate a parameter of interest of the formation. The receiver may be unsynchronized with respect to the transmitter.