FIELD: oil and gas industry.
SUBSTANCE: acid composition for treatment of low-permeable high temperature formations with high clay and carbonate contents contains, by mass %: hydrochloric acid of 4-6; formic or acetic acid of 5-8; corrosion inhibitor such as CGI-118, or Prod Ci-300 of 0.1-0.5; surfactant Neftenol-VVD of 0.1-0.5; iron stabiliser Hi-Iron 0.75-2; water - the rest.
EFFECT: intensification of oil inflow, increase in the formation permeability, slow down of the reaction rate of the formation treatment composition with the rock and elimination of silicic acid formation in reaction with clays at high formation temperature.
3 tbl, 4 ex
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