WIRE CHANNEL FOR TELEMETERING COMMUNICATION Russian patent published in 2003 - IPC

FIELD: telemetry, drilling and examination of wells in oil and gas industry. SUBSTANCE: wire channel for telemetering communication includes ground and well parts intercommunicated by communication line. Ground part has power supply unit which is source of D C voltage connected with one lead to communication line and with another lead to current-to-voltage converter connected to communication line. Ground part is provided with key element placed in parallel with resistor in current-to- voltage converter and connected by controlling lead to microprocessor system and with first differentiation circuit connected to current-to-voltage converter and placed in series with first hysteresis element linked to microprocessor system. Well part includes measurement unit, downhole power supply unit, controlled current source connected with two leads to communication line and with control lead to microcontroller which is connected to measurement unit, input unit connected with input leads to communication line and with output leads to stabilizer diode and well power supply source, second differentiation circuit connected to communication line and placed in series with second hysteresis element which is connected to microcontroller. EFFECT: increased noise immunity while transmitting information with simultaneous prevention of break of power supply to downhole logging instrument in process of transmission of information over single- core cable, provision for bi-directional information transmission. 2 dwg