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1. (WO2018102362) NMR WELL LOGGING INSTRUMENT AND METHOD WITH SYNTHETIC APERTURES

Pub. No.:    WO/2018/102362    International Application No.:    PCT/US2017/063627
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Thu Nov 30 00:59:59 CET 2017
IPC: G01V 3/32
G01R 33/44
E21B 47/00
Applicants: SCHLUMBERGER CANADA LIMITED
SERVICES PETROLIERS SCHLUMBERGER
SCHLUMBERGER TECHNOLOGY B.V.
SCHLUMBERGER TECHNOLOGY CORPORATION
Inventors: HURLIMANN, Martin
BULU, Irfan
SONG, Yi-Qiao
Title: NMR WELL LOGGING INSTRUMENT AND METHOD WITH SYNTHETIC APERTURES
Abstract:
An apparatus for measuring nuclear magnetic resonance (NMR) properties of subsurface formations includes a magnet for pre-polarizing nuclear spins in the formations. A plurality of transmitter antennas is spaced apart along a length of the apparatus. The apparatus includes at least one of a receiver circuit selectively coupled to at least one of the plurality of transmitter antennas and a separate receiver antenna. The apparatus includes circuitry for applying radio frequency current pulses selectively to each of the plurality of transmitter antennas such that during a NMR measurement sequence while the apparatus is moving substantially only those of the plurality of transmitter antennas having radio frequency current pulses applied thereto are disposed longitudinally along a same region of interest in the subsurface formations.