FIELD: gas and petroleum industry.
SUBSTANCE: invention relates to the petroleum and gas industry. The dry acid composition for acid treatment of terrigenous reservoirs comprises, % wt.: ammonium chloride 25.0 to 35.0; ammonium fluoride 2.0 to 6.0; acid corrosion inhibitor Invol 2B 0.05 to 0.15; acid corrosion inhibitor Sonkor 9510K 0.05 to 0.15; ampholytic surface-active agent "Neftenol VUPAV" 0.5 to 1.5; polyoxyethylene glycol ethers of higher fatty acids - OS-20 preparation 2.0 to 5.5; citric acid 10.0 to 20.0; sulfamic acid the rest.
EFFECT: technical result is increased efficiency of dissolution of a terrigenous collector, including those with an increased clay content and in a wide range of formation temperatures, prevented secondary deposition under conditions of increased formation temperatures due to reduced inter-phase tension at the boundary with hydrocarbons with simultaneous inhibition of the process of hydrolysis and decrease in corrosive activity.
1 cl, 5 tbl, 8 ex
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