The utility model comprises a paraffin bag provided with paraffin wax, and an electric heater is arranged in the paraffin bag.
实用新型包括石蜡袋子带有石蜡，并且一台电暖气在石蜡袋子被安排。
2
The utility model is a superconducting device of self heat source of oil well avoiding wax and reducing viscosity, and belongs to novel field of heat transfer technology of vacuum tube.