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1. WO2018132086 - STACKED SOFT MAGNETIC INSERTS AND SLOTTED SHIELD DESIGNS FOR TILTED COIL ANTENNAS

Publication Number WO/2018/132086
Publication Date 19.07.2018
International Application No. PCT/US2017/012829
International Filing Date 10.01.2017
IPC
E21B 47/00 2006.01
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47Survey of boreholes or wells
G01V 3/26 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
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
G01V 3/10 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
08operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
10using induction coils
G01V 3/08 2006.01
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation
08operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
CPC
E21B 47/00
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
47Survey of boreholes or wells
G01V 3/28
GPHYSICS
01MEASURING; TESTING
VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
3Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
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
H01Q 1/04
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
QANTENNAS, i.e. RADIO AERIALS
1Details of, or arrangements associated with, antennas
04Adaptation for subterranean or subaqueous use
H01Q 1/526
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
QANTENNAS, i.e. RADIO AERIALS
1Details of, or arrangements associated with, antennas
52Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
526Electromagnetic shields
H01Q 7/08
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
QANTENNAS, i.e. RADIO AERIALS
7Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
06with core of ferromagnetic material
08Ferrite rod or like elongated core
Applicants
  • HALLIBURTON ENERGY SERVICES, INC. [US]/[US]
Inventors
  • BITTAR, Michael
  • MA, Jin
  • WU, Hsu-Hsiang
Agents
  • TUMEY, Corey, S.
Priority Data
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) STACKED SOFT MAGNETIC INSERTS AND SLOTTED SHIELD DESIGNS FOR TILTED COIL ANTENNAS
(FR) INSERTS MAGNÉTIQUES SOUPLES EMPILÉS ET CONCEPTIONS DE BLINDAGE À FENTES POUR ANTENNES À BOBINE INCLINÉE
Abstract
(EN)
An antenna assembly includes a tool mandrel having a tool axis and a coil including a plurality of windings wrapped about the tool mandrel at a winding angle offset from the tool axis. An antenna shield is secured to the tool mandrel and positioned radially outward from the coil. The antenna shield defines a plurality of slots extending perpendicular to the coil at any angular location about a circumference of the tool mandrel and the plurality of slots is provided in two or more dissimilar lengths.
(FR)
La présente invention concerne un ensemble antenne comprenant un mandrin d'outil ayant un axe d'outil, et une bobine comprenant une pluralité d'enroulements enroulés autour du mandrin d'outil selon un angle d'enroulement décalé par rapport à l'axe d'outil. Un blindage d'antenne est fixé au mandrin d'outil et positionné radialement vers l'extérieur à partir de la bobine. Le blindage d'antenne définit une pluralité de fentes s'étendant perpendiculairement à la bobine au niveau de tout emplacement angulaire autour d'une circonférence du mandrin d'outil et la pluralité de fentes sont prévues dans au moins deux longueurs différentes.
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