DEVICE FOR ELECTROMAGNETIC LOGGING OF HOLES Russian patent published in 2003 - IPC

FIELD: field geophysical equipment. SUBSTANCE: invention is meant for measurement and study of distribution of specific electric resistance of rocks both along axis of hole and along directions lying in planes perpendicular to its axis in order to expose crack collectors, to study horizontal and inclined-directional holes. Device has high-frequency generator, system of spatially matched generator coils arranged on electric insulation rod, system of spatially matched near and far receiving coils put on electric insulation rod, switch unit, amplification-conversion unit, information separation and processing unit, switch of generator coils, switch of receiving coils, output terminals. System of generator coils and system of near and far receiving coils have k generator, near and far receiving coils. In each system of coils magnetic moments of coils are shifted relative one another through angle equal to and lie in planes perpendicular to axis of electric insulation rod and magnetic moments of generator, near and far receiving coils possessing similar numbers are complanar. Amplification-conversion unit comes in the form of either amplitude-to-code converter or phase-to-code converter. EFFECT: increased precision in measurement of specific electric resistance of azimuthally inhomogeneous media, reduced labor input in manufacture of device and in its operation. 4 cl, 9 dwg