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1. (WO2018222208) SIGNAL PROCESSING OF MULTI-SUB ROTATIONAL RESISTIVITY LOGGING TOOL

Pub. No.:    WO/2018/222208    International Application No.:    PCT/US2017/035765
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Sat Jun 03 01:59:59 CEST 2017
IPC: E21B 47/00
G01V 3/26
G01V 3/38
Applicants: HALLIBURTON ENERGY SERVICES, INC.
Inventors: MA, Jin
WU, Hsu-hsiang
Title: SIGNAL PROCESSING OF MULTI-SUB ROTATIONAL RESISTIVITY LOGGING TOOL
Abstract:
A method comprising determining a resistivity of a formation, based on a detection of angular electromagnetic signals by a receiver antenna on a first sub of a multi-sub resistivity tool during rotational operation in a wellbore within the formation, the angular electromagnetic signals emitted into the formation, prior to the detection, by a transmitter antenna on a second sub of the multi-sub resistivity tool, wherein the first sub and the second sub are separated apart such that the angular electromagnetic signals are to be transmitted deep into the formation, wherein determining the resistivity comprises curve-fitting and reproducing angular electromagnetic signals by the receiver antenna, and decoupling component signals based on fitting coefficients derived from the angular electromagnetic signals.