DEVICE FOR ELECTROMAGNET LOGGING OF HOLES Russian patent published in 1996 - IPC

FIELD: geophysical testing of electric parameters of rocks; oil and gas prospecting. SUBSTANCE: device has three basic groups of electron units, i. e. telemetry and automatic control units, generators with inductive radiators and receivers for measuring electromagnetic field. M-inductive filter is mounted among inductive irradiators and receivers; m-inductive filter is combined at single unit. Switch multiplexer is mounted as well. Receivers are connected automatically through these members with automatic control unit, heterodyne frequencies unit, wideband phasemeter. Inductance coils of m-inductive filter have to elongations of transit wires and cables. Magnetic circuit of m-inductive filter is disposed in align with rods of probes. As a result, m-inductive filter and switch multiplexer form barrier for measuring circuits against electromagnet field noises and different types of conductivities. EFFECT: improved reliability of prospecting. 4 cl, 1 dwg