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1. (US20160109612) Methods and apparatuses to remove a net detected residual magnetization in a nuclear magnetic resonance (NMR) operation

Office : United States of America
Application Number: 14516404 Application Date: 16.10.2014
Publication Number: 20160109612 Publication Date: 21.04.2016
Grant Number: 09915750 Grant Date: 13.03.2018
Publication Kind : B2
IPC:
G01V 3/00
G01V 3/32
G01V 3/38
G01N 24/08
G01R 33/561
G01R 33/565
G PHYSICS
01
MEASURING; TESTING
V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
G PHYSICS
01
MEASURING; TESTING
V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
18
specially adapted for well-logging
32
operating with electron or nuclear magnetic resonance
G PHYSICS
01
MEASURING; TESTING
V
GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3
Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
38
Processing data, e.g. for analysis, for interpretation or for correction
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
24
Investigating or analysing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
08
by using nuclear magnetic resonance
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
48
NMR imaging systems
54
Signal processing systems, e.g. using pulse sequences
56
Image enhancement or correction, e.g. subtraction or averaging techniques
561
by reduction of the scanning time, i.e. fast acquiring systems, e.g. using echo-planar pulse sequences
G PHYSICS
01
MEASURING; TESTING
R
MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
33
Arrangements or instruments for measuring magnetic variables
20
involving magnetic resonance
44
using nuclear magnetic resonance (NMR)
48
NMR imaging systems
54
Signal processing systems, e.g. using pulse sequences
56
Image enhancement or correction, e.g. subtraction or averaging techniques
565
Correction of image distortions, e.g. due to magnetic field inhomogeneities
CPC:
G01N 24/081
G01R 33/5617
G01R 33/56563
G01R 33/5659
G01V 3/32
G01V 3/38
Applicants: Schlumberger Technology Corporation
Inventors: Martin D. Hurlimann
Yi-Qiao Song
Jeffrey L. Paulsen
Shin Utsuzawa
Priority Data:
Title: (EN) Methods and apparatuses to remove a net detected residual magnetization in a nuclear magnetic resonance (NMR) operation
Abstract: front page image
(EN)

In one aspect, a nuclear magnetic resonance (NMR) system includes a transmitter to output a main refocusing pulse sequence and at least one subsequent refocusing pulse sequence into a zone of interest, a randomizing pulse module to output a randomizing pulse into the zone of interest to remove a net detected residual magnetization, and a receiver to output an NMR data set from the zone of interest. In another aspect, a method of generating a nuclear magnetic resonance (NMR) data set includes outputting a main refocusing pulse sequence and at least one subsequent refocusing pulse sequence into a zone of interest, outputting a randomizing pulse from a randomizing pulse module into the zone of interest to remove a net detected residual magnetization, and sensing the NMR data set from the zone of interest.