FIELD: oil and oil-and-gas producing industry, more specifically, well operation, applicable for instance, in well servicing. SUBSTANCE: method includes introduction of viscoelastic separating composition, preparation and injection into well of killing fluid with purposeful additives for counterbalancing of formation pressure. Killing fluid is used in form of aqueous solution of carnallite ore with solution density of 1.23-1.25 t/cu.m. Thickening agent is used in form of xanthane resin in amount of 0.1-1.0 wt. %. In preparation of said solution, if is subjected to setting for 30-45 min. EFFECT: preserved reservoir properties of bottomhole zone. 2 tbl, 6 ex
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