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1. (WO2015047226) EVALUATION OF DOWNHOLE ELECTRIC COMPONENTS BY MONITORING UMBILICAL HEALTH AND OPERATION

Pub. No.:    WO/2015/047226    International Application No.:    PCT/US2013/061442
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Wed Sep 25 01:59:59 CEST 2013
IPC: E21B 47/008
E21B 47/12
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: FRIPP, Michael Linley
DYKSTRA, Jason
BU, Fanping
Title: EVALUATION OF DOWNHOLE ELECTRIC COMPONENTS BY MONITORING UMBILICAL HEALTH AND OPERATION
Abstract:
A method for monitoring the health of a downhole electrical system including a umbilical cable that connects a downhole electric tool to a power source or controller includes delivering electric signals, such as voltage pulses, to the downhole electric tool, which may be an electric submersible pump. The signals are delivered via the cable from a signal generator and are partially reflected by impedance mismatches in the cable or at other points in the system. Each such partially reflected signal, or response signal, is received by a controller and compared to the delivered electric signals to determine a condition of the power transmission cable.