COMPOSITION FOR INHIBITING SALT DEPOSITION Russian patent published in 2019 - IPC C09K8/528 C09K8/54 C02F5/10 C23F11/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to compositions for preventing inorganic deposits of calcium and barium, which can be used in oil industry, in particular in wells and on well equipment, in oil collection, preparation and transportation system. Composition for preventing loss of calcium carbonate, calcium sulphates and barium, which are difficult to dissolve in water, including oxyethylidene diphosphonic, nitrilotrimethylphosphonic acids, monoethanolamine, methanol and water, additionally contains hydrolysed polyacrylonitrile in form of its solution with density from 1.1 to 1.3 g/cm³ in following ratio of components, wt%: oxyethylidenediphosphonic acid – 8.0–12.0, nitrilotrimethylphosphonic acid – 2.0–3.0, monoethanolamine – 10.0–12.0, hydrolysed polyacrylonitrile in form of said solution with density of 1.1 to 1.3 g/cm³ (on dry) — 0.38–0.63, methanol – 36.0–44.0, water – balance.

EFFECT: high inhibiting power and low corrosion aggressiveness.

1 cl, 5 tbl