METHOD AND DEVICE FOR DESTRUCTION OF ASPHALT-RESINOUS, HYDRATE-PARAFFIN AND GLACIAL DEPOSITS IN OIL AND GAS WELLS Russian patent published in 1998 - IPC

FIELD: oil and gas recovery; technology of removal of deposits formed in course of operation of wells. SUBSTANCE: method consists in action on deposits by means of electric heaters of various construction which are lowered in well by means of logging cable or pipes. Thermal flows are divided, concentrated and directed to working surfaces of heaters which are in contact with deposits. Electric and thermal power of heater is concentrated in its nose portion. To this end, housing of device where heaters are located may be solid or may be made from separate parts (connected or not connected) at stepped, straight or wavy generatrix and diameter increasing in cross sections from nose portion to head portion. Cubic resistance-heat radiator is mounted in series with heaters in nose portion of housing. EFFECT: enhanced efficiency. 17 cl, 9 dwg