METHOD OF ELECTRIC HEATING OF OIL WELL AT OIL PRODUCTION COMPLEX AND DEVICE TO THIS END Russian patent published in 2014 - IPC E21B36/04 E21B43/24 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to electrical processes in oil-and-gas production and can be used for removal of waxy and other sediments from oil strings and wells. Proposed method consists in using the electric circuit for heating purposes. Note here that said electric circuit if composed by flow strings, borehole contact, casing and insulating components. Electric circuit input terminals are connected with controlled power supply composed by semiconductor converter, interconnected control system and current regulator and connected with semiconductor converter current pickup connected to supply circuit. Additionally, pump motor load transducer is introduced in said circuit while relay element with hysteresis characteristic is added in controlled power supply and connected to current regulator input and, by its output, to added pump motor current pickup. Said controlled power supply is connected to output terminals of heating electric circuit. Note here that controlled electric power source is switched on at load at oil pump motor increase above preset magnitude, for example, rated load and switched off at appropriate decrease. For this, "input-output" hysteresis characteristic is created at controlled power source.

EFFECT: higher quality of removal of waxy sediments, lower oil thickness.

2 cl, 2 dwg