INHIBITOR OF CORROSION OF FERRIC METALS IN ACID MEDIA Russian patent published in 2002 - IPC

FIELD: corrosion protection. SUBSTANCE: inhibitory composition contains 25-50% of product of condensation of coal-origin pyridine bases with coal phenols, 10-40% of free coal-origin pyridine bases, and 10-50% of benzene and its methyl-derivatives. Inhibitor can be used both in low-acidic and in high-acidic media with elevated protection effects. When used for acid treatment of wells, inhibitor does not reduce effects of concentrated (15-30%) acid solution on producing formation. EFFECT: increased anticorrosion efficiency and reduced expenses on raw materials. 2 cl, 5 tbl