FIELD: oil industry.
SUBSTANCE: invention relates to oil industry, namely to compositions for acid treatment of bottomhole formation zone with carbonate and terrigenous reservoirs. Acid composition for treatment of bottomhole formation zone contains, wt%: hydrogen chloride 6.0–24.0; complex reagent SNPKh-8903A 2.0–4.0; iron ion stabilizer SNPKh-8905 1.0–2.0; water is the rest. If the content of hydrogen chloride HCl is 10.0–21.0 wt%, the acid composition can additionally contain hydrogen fluoride HF in amount of 1.0–5.0 wt%. Acid composition can additionally contain Desulfone – SNPKh-1300 — 0.1–0.5 wt% hydrogen sulfide scavenger.
EFFECT: intensification of oil inflow, increase of injectivity of wells, reduction of corrosiveness of the composition in relation to structural steel, compatibility with formation fluids, prevention of formation of emulsions and gum formation, provision of control over iron ions.
4 cl, 3 tbl, 21 ex
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