FIELD: protection of boreholes and pipelines against corrosion, hydrogen saturation and salt deposition. SUBSTANCE: proposed composition comprises, wt. %: polystyrene or wastes resulting from polystyrene production (trade name "KORE", USSR standard TU3830022-81) 10-30, still residue of caprolactam production, formed in benzol acid synthesis stage (USSR standard TU-113-03-28-30-87) 20-40, nitrilotrimethylene phosphonic acid calcium salt 20-40, and hydroxyethylidene diphosphonic acid sodium salt 10-30. EFFECT: composition prolongs term of action of inhibitors used to protect oil extraction equipment simultaneously against salt deposition, corrosion and hydrogen saturation. 1 cl, 1 tbl
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