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1. (WO1979000855) METAL TYPE DETECTOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1979/000855 International Application No.: PCT/US1979/000195
Publication Date: 01.11.1979 International Filing Date: 23.03.1979
IPC:
E21B 47/00 (2012.01) ,E21B 47/09 (2012.01) ,G01D 9/42 (2006.01) ,G01N 27/72 (2006.01) ,G01V 3/10 (2006.01)
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47
Survey of boreholes or wells
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
47
Survey of boreholes or wells
09
Locating or determining the position of objects in boreholes or wells; Identifying the free or blocked portions of pipes
G PHYSICS
01
MEASURING; TESTING
D
MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
9
Recording measured values
42
Recording indications of measuring instruments by photographic means, e.g. of counters
G PHYSICS
01
MEASURING; TESTING
N
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27
Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
72
by investigating magnetic variables
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
08
operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
10
using induction coils
Applicants:
Inventors:
Priority Data:
89228431.03.1978US
Title (EN) METAL TYPE DETECTOR
(FR) DETECTEUR DU TYPE D"UN METAL
Abstract:
(EN) A combination of magnetics and a special geometric environment is employed to distinguish whether an instrument is positioned within a pipe formed of magnetizable or non-magnetizable material, and is the bases, in part, for a method and an apparatus used in controlling picture taking at the bottom of a well bore. A coil (20) is energized repetitively in a circuit (98, 118, 20) in which the voltage across the coil (20), or the current that flows through the coil (20), can be measured. Whether the coil (20) is in a magnetic (12) or non-magnetic (14) environment is determined by the magnitude of the change in coil voltage or current.
(FR) Une combinaison magnetique et un milieu geometrique special sont utilises pour determiner si un instrument est place dans un tube fait en materiau magnetisable ou non magnetisable et forment, en partie, la base d"une methode et d"un appareil utilises pour la commande de prise de photos au fond d"un forage. Une bobine (20) est excitee de maniere repetee dans un circuit (98, 118, 20) ou la tension de la bobine (20) ou le courant passant au travers de la bobine (20) peut etre mesure. L"amplitude du changement de la tension ou du courant de la bobine determine si la bobine (20) se trouve en milieu magnetique (12) ou non magnetique (14).
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)