COMPOSITION FOR IMPACT ON DOMANIC DEPOSITS Russian patent published in 2020 - IPC C09K8/74 

FIELD: oil industry.

SUBSTANCE: composition for action on house deposits contains, wt %: aqueous solution of synthetic hydrochloric acid of 24 % concentration of 56.0–63.0; acid-corrosion inhibitor TH-IKKS 14.0–6.5; surfactant Efril 3.5–8.0; technical lignosulphonates, which are a mixture of lignosulphonic acid salts with an admixture of reducing substances and mineral salts, obtained by evaporating bisulphite alkali formed during pulping of cellulose from wood chips to concentration of dry substances of not less than 50 %, 17.0–22.0.

EFFECT: technical result is improved physical and chemical and processing properties of treatment composition, slower reaction rate with dense rocks of house deposits, reduced filtration resistance in the formation due to limitation of formation of secondary precipitation, low interfacial tension at the boundary "acid composition—oil" and compatibility with formation fluids, wider field of application of the treatment composition.

1 cl, 9 tbl