COMPOSITION FOR ACID TREATMENT OF BOTTOMHOLE ZONE OF CARBONATE RESERVOIRS Russian patent published in 2023 - IPC C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: composition for acid treatment of the bottomhole zone of carbonate reservoirs contains, wt.%: acetic acid 55-65; propionic, butyric, formic and/or succinic acids 1.5-5; organic solvent 10-20; corrosion inhibitor based on methenamine, thiourea and copper (II) sulfate 1.0-1.5; water the rest.

EFFECT: intensification of oil production from productive formations with a carbonate type of reservoir with low values of permeability and porosity by increasing the depth of penetration of the composition into the formation, the ability to remove iron hydroxide from the treatment zone, the absence of organochlorine compounds in the reaction products.

4 cl, 2 tbl, 4 ex