COMPOSITION FOR REMOVAL OF DEPOSITS OF INORGANIC SALTS IN WELL (VERSIONS) Russian patent published in 2019 - IPC C09K8/528 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry, in particular to compositions for removal of deposits of inorganic salts in well and oil-field equipment during extraction of viscous and ultraviscous oil. Composition for removal of deposits of inorganic salts in well, which includes disodium salt of ethylenediaminetetraacetic acid and water, additionally contains ammonium acetate, with following ratio of components, wt. %: disodium salt of ethylenediaminetetraacetic acid - 5–15, ammonium acetate - 0.1–3.0, fresh water - balance, wherein content of ammonium acetate is 2–20 % of mass of disodium salt of ethylenediaminetetraacetic acid. According to another version, composition for removal of deposits of inorganic salts in well, which includes disodium salt of ethylenediaminetetraacetic acid and water, additionally contains ammonium acetate and high-temperature inhibitor of Neuting at following ratio of components, wt. %: disodium salt of ethylenediaminetetraacetic acid - 5–15, ammonium acetate - 0.1–3.0; said inhibitor - 0.01–1.0, fresh water - balance, wherein content of ammonium acetate is equal to 2–20 % of weight of disodium salt of ethylenediaminetetraacetic acid.

EFFECT: technical result is high efficiency of the composition for removing deposits of inorganic salts in the well by increasing the solvent capacity of the composition and reducing corrosion activity with respect to oil-field equipment.

2 cl, 1 tbl