Circulating heating device for oil pumping conduit

The utility model discloses an oil-pumping pipe circulation heating device, comprising a heat-conducting pipe; a through hole is arranged at the utmost bottom end of the heat-conducting pipe, and the heat-conducting pipe is arranged in a hollow oil-pumping pipe in a penetrating way, and the heat-conducting pipe is an integral body along the pipe length direction. In a preferable embodiment, the heat-conducting pipe is heat insulating, for example, the pipe wall of the heat-conducting pipe is composed of a metal inner layer, a metal outer layer and a nonmetal heat insulating layer arranged between the metal inner layer and the metal outer layer. The oil-pumping pipe circulation heating device can ensure that back flow of heating medium of the whole heat-conducting pipe in the mid-way owning to short circuit can not happen, so as to affect the heating to the oil-pumping pipe at the well depth position; the device is more reliable, and can lead the high-temperature medium poured in the heat-conducting pipe to st