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1. WO2020112805 - POWER-EFFICIENT TRANSIENT ELECTROMAGNETIC EVALUATION SYSTEM AND METHOD

Publication Number WO/2020/112805
Publication Date 04.06.2020
International Application No. PCT/US2019/063295
International Filing Date 26.11.2019
IPC
G01F 1/58 2006.01
GPHYSICS
01MEASURING; TESTING
FMEASURING VOLUME, VOLUME FLOW, MASS FLOW, OR LIQUID LEVEL; METERING BY VOLUME
1Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through the meter in a continuous flow
56by using electric or magnetic effects
58by electromagnetic flowmeters
G01N 27/10 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
02by investigating impedance
04by investigating resistance
06of a liquid
08which is flowing continuously
10Investigation or analysis specially adapted for controlling or monitoring operations or for signalling
G01N 27/90 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72by investigating magnetic variables
82for investigating the presence of flaws
90using eddy currents
G01N 29/24 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
29Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
22Details
24Probes
H01F 7/06 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
7Magnets
06Electromagnets; Actuators including electromagnets
G01V 1/40 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
1Seismology; Seismic or acoustic prospecting or detecting
40specially adapted for well-logging
CPC
E21B 47/00
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
47Survey of boreholes or wells
E21B 49/00
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
49Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
G01V 3/28
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
3Electric or magnetic prospecting or detecting
18specially adapted for well-logging
26operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
28using induction coils
Applicants
  • BAKER HUGHES, A GE COMPANY, LLC [US]/[US]
Inventors
  • FORGANG, Stanislav
  • KOUCHMESHKY, Babak
  • DUTTA, Sushant
  • GOLD, Randy
Agents
  • EVANS, Taylor, P.
Priority Data
16/204,62629.11.2018US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) POWER-EFFICIENT TRANSIENT ELECTROMAGNETIC EVALUATION SYSTEM AND METHOD
(FR) SYSTÈME ET PROCÉDÉ D'ÉVALUATION ÉLECTROMAGNÉTIQUE TRANSITOIRE À FAIBLE CONSOMMATION D'ÉNERGIE
Abstract
(EN)
A system (400) for performing downhole logging operations includes a power supply (402) for providing a current and a conductor coil (406) electrically coupled to receive the current from the power supply (402). The system (400) further includes a switch (410) electrically coupled to the power supply (402) for controlling current provided to the conductor coil (406) and enabling a pulse of current to be supplied to the conductor coil (406) for an "on" duration and turning off current provided to the conductor coil (406) for an "off' duration after the "on" duration, in which the "off' duration lasts longer than the "on" duration. The system (400) also includes a permanent magnet (408) coupled to the conductor coil (406). The conductor coil (406) receives the pulse of current from the power supply (402) during the "on" duration and not receiving current during the "off' duration. The pulse of current causes the permanent magnet (408) to reverse polarity and generate a transient magnetic field.
(FR)
L'invention concerne un système (400) servant à effectuer des opérations de diagraphie de fond comprenant une alimentation électrique (402) pour fournir un courant et une bobine conductrice (406) électriquement couplée pour recevoir le courant provenant de l'alimentation électrique (402). Le système (400) comprend en outre un commutateur (410) couplé électriquement à l'alimentation électrique (402) pour commander le courant fourni à la bobine conductrice (406) et permettant de fournir une impulsion de courant à la bobine conductrice (406) pendant une durée « marche » et d'éteindre le courant fourni à la bobine conductrice (406) pendant une durée « arrêt » après la durée « marche », la durée « arrêt » étant plus longue que la durée « marche ». Le système (400) comprend également un aimant permanent (408) couplé à la bobine conductrice (406). La bobine conductrice (406) reçoit l'impulsion de courant provenant de l'alimentation électrique (402) pendant la durée « marche » et ne reçoit pas de courant pendant la durée « arrêt ». L'impulsion de courant amène l'aimant permanent (408) à inverser la polarité et à générer un champ magnétique transitoire.
Also published as
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