COMPOSITION FOR ACID TREATMENT OF BOTTOMHOLE FORMATION ZONE Russian patent published in 2018 - IPC C09K8/74 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used for the acid treatment of the bottomhole formation zone represented by carbonate reservoirs. Composition for the acid treatment of the bottomhole formation zone includes, wt%: inhibited hydrochloric acid 37.5–95.8; surfactant – reagent ITPS-906 grade K 0.5–6.0; mixture of carbohydrates and a solution of surfactants in mineral acid – reagent ITPS-708 grade A 0.5–2.0; water – balance.

EFFECT: development of a composition for acid treatment of the bottomhole formation zone, which is fully compatible with the oil of PJSC Tatneft, namely by dispersing the deposits of tar sediments and eliminating the formation of emulsions upon contact of the acid composition with oil, high reduction of iron ions, as well as low corrosion rate and high permeability in the formation due to slowing of the reaction rate of the acid with the carbonate rock of the formation.

1 cl, 3 tbl