| 摘要 |
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 |
