DEVICE FOR MEASUREMENT OF GEOPHYSICAL AND TECHNOLOGICAL PARAMETERS IN PROCESS OF DRILLING WITH ELECTROMAGNETIC COMMUNICATION CHANNEL Russian patent published in 2014 - IPC E21B47/13 G01V3/18 

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of geophysical survey of wells, namely, to devices for measurement of geophysical and technological parameters in process of drilling. The device according to the invention comprises a bottomhole telemetering system (BTS), including a drilling string, a body, a power supply unit, measurement modules, a transceiving module, an electric separator, made in the form of a separate adapter. The ABM is installed directly above a bit. At the same time the bit comprises a body with a central washing hole, on which the central electrode is placed. In its turn the central electrode is arranged between insulators and is electrically insulated from the body, where electric circuits, measurement sensors, source of power supply and transmitting device are installed. At the same time the ABM is equipped with a probe of measurement of specific electric resistance of a bed, including a current meter connected to the bottom of the drilling string and the central electrode of the specified module, and the meter of potential difference between the bottom of the drilling string and the central electrode of the specified module. Besides, the outlets of the current meter and the specified meter of potential difference are connected to the outlet unit of the transmitting device of the ABM.

EFFECT: increased information value of measurements and accuracy of geonavigation in process of drilling due to arrangement of a probe for measurement of specific electric resistance at the maximum close distance to a bit in an above bit module (ABM).

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