FIELD: oil and gas industry.
SUBSTANCE: system for thermal treatment in situ for hydrocarbons extraction from underground formation contains many well bores in formation; pipelines are arranged at least in two well bores. Moreover it includes the system of fluid circulation connected to the said pipelines; heat source is configured for heating liquid heat-carrier circulating with the aid of circulation system through pipelines with formation heating up to temperatures that allow extraction of hydrocarbons from formation. It also contains one or more electric heaters connected to pipelines configured for initial heating of pipelines up to the temperature exceeding the temperature of liquid heat-carrier hardening. Note that said electric heaters contain one or more conductors connected to the pipelines. Note that the said conductors are configured in such a way to provide power supply to pipelines for their resistance heating. Method for underground formation heating includes heating of liquid heat-carrier by heat exchanging with heat source. Note that the pipelines are heated up to the temperature enough for prevention of liquid heat-carrier hardening in pipelines. Hydrocarbons are extracted from formation.
EFFECT: increase of hydrocarbons production efficiency.
19 cl, 10 dwg, 1 tbl
