COMPOSITION FOR TREATING THE BOTTOMHOLE ZONE OF THE BOREHOLE Russian patent published in 2022 - IPC C09K8/74 

FIELD: petroleum industry.

SUBSTANCE: invention relates to the petroleum industry and can be used in the treatment of the bottomhole zone of injection and production boreholes in low-permeability carbonate reservoirs. Composition for treating the bottomhole zone contains, vol.%: hydrochloric acid or mud acid 10 to 24; multifunctional reagent 2 to 5; iron stabiliser 0.5 to 1; water the rest. Said multifunctional reagent constitutes a salt of alkyl C_10-16trialkylammonium by the general formula (R₁R₂R₃R₄N)⁺An^-, wherein R₁=C₁₀H₂₁-C₁₆H₃₃, R₂=R₃=R₄=CH₃, An^- = phosphonate, formate, or acetate ion. The composition for treating the bottomhole zone may additionally contain a corrosion inhibitor in an amount of 1 to 2 vol.%.

EFFECT: increase in the permeability of the layer due to the increase in the depth of treatment, treatment of low-permeability zones of the layer, prevented mudding of the bottomhole zone with the reaction products, prevented development of biocoenosis, cake removal from the bottomhole zone of the layer.

2 cl, 1 dwg, 5 tbl