FIELD: oil industry.
SUBSTANCE: device has current conductor with pipe body mounted below it. On the surface of pipe body long-dimensional heating element is placed - cable with low electric resistance. Cable is mounted in ferromagnetic pipe along pipe body with possible forming of closed contour and feeding of powering alternating voltage into it through current conductor. Long-dimensional heating element is placed in form of multi-passage series of parallel long-dimensional heating element. Ferromagnetic pipe is made separated on sections. As long-dimensional heating element oil-resistant cable is used. Ferromagnetic pipe is welded to pipe body by discontinuous seam. Above long-dimensional heating element a layer of isolating material is applied for amplification of heating.
EFFECT: higher efficiency of well electric heater.
6 cl, 3 dwg, 1 tbl, 1 ex
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