FIELD: gas and oil producing industry. SUBSTANCE: method consists in mixing compressed air with water injected into formation under pressure being enough to promote dissolving of oxygen contained in air in water as its amount in air is lower than that of nitrogen. Gas phase comprised of nitrogen is removed from air-water mixture at same increased pressure. Then, gaseous nitrogen removed under pressure is mixed with surfactant and supplied into water injected into one of wells which is to be completed, or whose bottom-hole zone is to be cleaned with foamy system. The latter is used for replacement of drilling mud and reduction of well bottom-hole pressure. EFFECT: higher efficiency of well system completion provided with pressure water line. 1 dwg
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