CORROSION INHIBITOR FOR ACID TREATMENT AT 200°C AND USE THEREOF Russian patent published in 2024 - IPC C23F11/04 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: present invention relates to the field of increasing production and transformation of oil and gas formations, namely to a corrosion inhibitor used in acid treatment, which is effective at temperature of 200°C, and its application. Inhibitor includes component A and component B. Component A contains 30–45 parts by weight of aldehyde-ketone-amine condensation product, 5–8 parts by weight of quinoline quaternary ammonium salt, 1–17 parts by weight of organic acid, 3–10 parts by weight of alkynol derivative, 15–40 parts by weight of organic promoter, 5–15 parts by weight of alcohol solvent and 5–15 parts by weight of dispersant. Quinoline quaternary ammonium salt is synthesized by quaternisation of quinoline with one or a combination of two or more of benzyl chloride, benzyl methyl alcohol, benzyl propyl alcohol and cetyldimethyl benzyl ammonium chloride. Component B is selected from one or a combination of two or more of copper chloride, potassium iodide, potassium pyroantimonate, antimony trioxide and sodium molybdate. Weight ratio of component A to component B is (4.0–5.0):(0.5–1.5).

EFFECT: possibility of using inhibitor at temperature up to 200°C, reduced risk of corrosion of downhole tubing strings during acid treatment and transformation of superdeep and ultrahigh temperature carbonate rocks.

15 cl, 1 dwg, 6 tbl, 7 ex