FIELD: measuring equipment.
SUBSTANCE: invention relates to the field of geophysical research in oil wells, namely to a device for studying the electrical properties of the rock (reservoir) surrounding a borehole, the method of electromagnetic logging. Invented device comprises a base in the form of a non-magnetic conductive metal tube arranged coaxially with it a receiving coil with a ferromagnetic toroidal core and is provided with a sealed enclosure of a nonmagnetic metal which is electrically connected to the substrate. Receiving toroidal coil with a ferromagnetic core comprises at least two windings, one signal, the second - compensating. Winding connected to the signal input of the amplifier-converter feedback to the compensating coil - amplifier output converter feedback. On a base near the reception toroidal coil with a ferromagnetic core a receiving toroidal coil with a non-ferromagnetic core is placed. Both coils are mounted inside the housing with an insulating gap.
EFFECT: increase of measurement accuracy while simplifying the construction.
3 cl, 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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