DOWNHOLE DEVICE FOR MONITORING TEMPERATURE OF SUBMERSIBLE ELECTRIC MOTOR AND PRESSURE AT PUMP INTAKE Russian patent published in 1997 - IPC

FIELD: designed for investigation of wells to select optimal operating conditions of electric installations in oil recovery with consideration of operating conditions and necessity of protection of submersible electric motors from abnormal conditions. SUBSTANCE: generator controlled by voltage produces complicated frequency-modulated signal carrying concurrently information on actual pressure values at pump intake and temperature of windings of submersible electric motor measured by pressure and temperature transducers. Generated signal amplified by amplifier is directed through isolation transformer and capacitor to communication line in form of current supplying cable of submersible electric motor and secondary winding of power transformer of the surface station. Modulating frequency is produced by voltage-frequency converter. Use of generator 4 increases confidence of control of pressure and temperature, and quick response of the device. EFFECT: HIGHER EFFICIENCY. 2 cl, 3 dwg