FIELD: oil-and-gas industry.
SUBSTANCE: inventions group refers to methods and systems for hydrocarbons, hydrogen and/or other products production from various underground formations. Method of underground formation heating is means that melted salt is injected in first channel of pipe-in-pipe heater at first place. At that the melted salt injection to the first channel includes the melted salt injection in the internal pipe of the pipe-in-pipe heater, and melted salt passes through the flow switch to re-direct the flow from the internal pipe to the ring are between the internal and external pipes. The melted salt passes through the pipe-in-pipe heater in the formation to the second place at distance from the first place, at that during the melted salt passage through the pipe-in-pipe heater the heat is transferred from the melted salt to the treated area. The melted salt is removed from the pipe-in-pipe heart at specified second place.
EFFECT: higher efficiency of formation heating.
21 cl, 1 tbl, 12 dwg
