FIELD: oil industry. SUBSTANCE: invention specifically refers to technique preventing freezing of well-heads of water-injection wells in cold season. Heat of ground is used to prevent freezing of well-head. Additional energy is stored under condition of cyclic flooding during planned injection of water. For this purpose mechanical energy of flow of injected water is partially converted to electric energy. Later stored electric energy is employed for forced circulation of water. Forced circulation of water in well-head is started when temperature of it drops below +4 C. EFFECT: possibility of cyclic flooding both in summer and winter, that is round-the year, under autonomous condition. 1 cl
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