Magnetic head for conductivity imaging for use in boreholes

Details Magnetic head for conductivity imaging for use in boreholes Magnetic head for conductivity imaging for use in boreholes

G - Physics

01

V

G01V 3/00 (2006.01) G01R 33/12 (2006.01) G01V 3/18 (2006.01)

Patent

CA 2647025

A sensor for performing micro-conductivity measurements during well logging measurements in a borehole includes a magnetic core having a conductive insert wherein windings are driven with alternating current. Some embodiments include a sensor further having a conductive case. Various aspects of the sensor, such as dimensions and conductive properties of fabrication materials are selected to maximize performance of the sensor. Methods for using the sensor call for, among other things, placing the sensor in a well logging tool, and placing the tool in a well bore. A substantial focusing of the magnetic field on the wall of the borehole is achieved and provides for high quality data.

L'invention concerne un capteur servant à effectuer des mesures de micro-conductivité pendant les mesures de diagraphie de puits dans un trou de sonde, ledit capteur comprenant un noyau magnétique muni d'un insert conducteur dans lequel des bobinages sont excités par un courant alternatif. Certains modes de réalisation comprennent un capteur comportant en outre un boîtier conducteur. Divers aspects du capteur, comme les dimensions et les propriétés de conductivité des matériaux de fabrication, sont choisis de façon à maximiser les performances du capteur. Les procédés d'utilisation du capteur impliquent, entre autres, de placer le capteur dans un outil de diagraphie de puits et de placer l'outil dans un trou de sonde. Une concentration sensible du champ magnétique sur la paroi du trou de sonde est réalisée et permet d'obtenir des données de grande qualité.

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