FIELD: oil industry.
SUBSTANCE: invention relates to oil production and can be used for heating of high-viscosity and waxy oil directly in the well. Well heater comprises housing consisting of outer and inner walls, supply and discharge manifold with branch pipes installed coaxially with annular gap and forming a cavity for heating coolant. Besides, heater includes an additional heat exchange element made up of two cylindrical shells installed coaxially and connected to each other. Additional heat exchange element is installed in housing on pylons arranged at the ends of additional heat exchanging element. Wherein in the pylons there are channels for supply and removal of heating coolant.
EFFECT: technical result is increasing efficiency of production of high viscous and paraffin oil.
1 cl, 3 dwg
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