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Machine translation
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)
Applicants:
Inventors:
Priority Data:
892284 31.03.1978 US
Title (EN) METAL TYPE DETECTOR
(FR) DETECTEUR DU TYPE D"UN METAL
Abstract: front page image
(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)