FIELD: oil and gas industry.
SUBSTANCE: reagent composition for dissolving sulphate colmatant contains, wt%: complexing agent 13.0–16.0; potassium hydroxide 12.0–14.0; peroxy compound 1.0–2.0; water – balance. Complexing substance consists of ethylenediaminotetraacetic and nitrilotriacetic acids taken in ratio (3.00–3.33):1.
EFFECT: high efficiency of dissolving sulfate colmatant, high reliability and productivity of wells.
1 cl, 5 tbl
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