FIELD: drilling operations, measurement and transmission of downhole parameters in screening formations of high conductivity in process of drilling. SUBSTANCE: downhole telemetric system includes ground receiving-processing equipment, downhole logging tool with primary measurement converters and transmitter comprising upper and lower parts interconnected with the aid of cable and electric divider. Electric divider is positioned beneath jig in drilled hole and above screening formation and functions in the capacity of dipole formed as result of electric division of drill pipe string. Lower part of downhole logging tool is installed in mix of bottom-hole assembly of drill pipe string or above downhole motor, is centered and fixed in mounting device. The latter has receiving grooves which secure unambiguous circumferential orientation of lower part of downhole logging tool in string of drill pipes. Cable can be connected to upper part of downhole logging tool and mounted for rotation with reference to electric divider. System incorporates power supply source joined to upper part of downhole logging tool and comes in the form of electric generator or storage battery. Primary measurement converters can be built on basis of gyroscopic transmitters or ferrosonde transducers and mounting device can be made of magnetically permeable material in the form of tube that is part of mix of bottom-hole assembly. EFFECT: capability to transmit information through screening formations of high conductivity thanks raised level of signal. 4 cl, 1 dwg
