BOTTOMHOLE TELEMETRIC SYSTEM Russian patent published in 1999 - IPC

FIELD: geophysical well logging. SUBSTANCE: bottomhole telemetric system consists of downhole module with measuring transducers, transmitter and surface receiving and processing apparatuses. Transmitter is made in form of electric dipole installed in upper part of drill string formed due to separation of drill string lower part from upper part and connected with downhole module by wire communication channel. Transmitter has turbogenerator; power supply unit, connected with microcomputer unit and with downhole module by means of wire communication line; communication controller connected with microcomputer unit and with downhole module with the help of wire line; and power amplifier whose inputs are connected with power supply unit and microcomputer unit, and whose outputs are connected with upper part and lower part of drill string. Information on parameters arrives from downhole module through wire communication line to transmitter, where it is coded, amplified in power, and signal is directed with the help of electric dipole from transmitter via intermediate casing string to surface casing into rock. Signal propagated in rock is received by antenna and directed to receiving and processing complex. EFFECT: increased distance and velocity of transmission of information on downhole parameters in real time in course of drilling of horizontal well irrespective of its depth and electric resistance of rocks. 2 cl, 2 dwg