FIELD: oil and gas production. SUBSTANCE: when being reconditioned, oil, gas or injection well is filled with killing fluid to prevent formation liquid and gas blowout. In the well, packer with back valve is preliminarily installed above formation and killing fluid is pumped in over the packer to form fluid column providing excessive pressure as compared to pressure below the packer. Then depressurization of well is effected, downhole equipment is fulfilled, well is sealed and started up after killing fluid is preliminarily removed. EFFECT: enhanced reliability of operation. 2 dwg
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