FIELD: oil and gas industry.
SUBSTANCE: reagent composition for dissolution of carbonate colmatant contains, wt%: hydrochloric acid 8.0–20.0; complexing substance – oxyethylene diphosphonic acid – 0.5–4.0; acetic acid 2.0–5.0; clay particles swelling inhibitor – tertiary amine alkyldimethylbenzylammonium chloride 0.2–1.0; corrosion inhibitor – 1-hydroxyethyl-2-alkylimidazoline 0.5–2.0; antifoaming agent – polydimethylsiloxane 0.5–1.0; water – balance.
EFFECT: high efficiency of dissolving carbonate colmatant with simultaneous preservation of clay cement from rock of terrigenous reservoir-reservoir, higher reliability and productivity of wells.
1 cl, 4 tbl
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