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1. (WO2018049298) APPARATUS AND METHODS FOR MAKING AZIMUTHAL RESISTIVITY MEASUREMENTS WITH OFF-SET DIRECTIONAL ANTENNAS

Pub. No.:    WO/2018/049298    International Application No.:    PCT/US2017/050894
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Tue Sep 12 01:59:59 CEST 2017
IPC: G01V 3/30
G01V 3/28
G01V 3/34
G01V 3/12
G01V 3/26
E21B 47/01
E21B 47/12
Applicants: WELL RESOLUTIONS TECHNOLOGY
Inventors: WANG, Tsili
Title: APPARATUS AND METHODS FOR MAKING AZIMUTHAL RESISTIVITY MEASUREMENTS WITH OFF-SET DIRECTIONAL ANTENNAS
Abstract:
A resistivity measuring tool used in a drillstring having a drill bit on a distal end for drilling a wellbore in a formation includes a tool body having a longitudinal axis, a pair of transmitter antennas having magnetic moments parallel to the longitudinal axis of the tool body, and a pair of receiver antennas radially spaced from the longitudinal axis of the tool body and having transverse magnetic moment components pointed in opposite directions, wherein at least one of the receiver antennas has a transverse magnetic moment angled with respect to a component normal to the longitudinal axis of the tool body.