FIELD: oil industry.
SUBSTANCE: invention specifically relates to enhanced oil recovery of low-permeability clay-containing formations. The pyrotechnic composition for claying the formation contains oxidizing agents - ammonium nitrate and potassium nitrate, combustible components - polytrifluorochloroethylene and polyvinyl chloride in the following ratio, wt.%: ammonium nitrate 60-75; potassium nitrate 8-23; polytrifluorochloroethylene 8-19; polyvinyl chloride 5-15.
EFFECT: increasing the efficiency of the claying action due to deep penetration into the formation of combustion products active in relation to clay components - a mixture of hydrochloric and hydrofluoric acids with concentrations not exceeding 12 and 3%, respectively, as well as the formation of potassium fluoride in the combustion products, which, in the presence of organic matter is capable of forming an additional amount of hydrofluoric acid.
1 cl, 3 ex
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