METHOD OF PRODUCTION OF OLASOL T2P CORROSION INHIBITOR FOR PROTECTION OF STEEL DOWNHOLE EQUIPMENT AND OIL-GATHERING SYSTEMS Russian patent published in 1999 - IPC

FIELD: production of novel corrosion inhibitors for protection of steel downhole equipment and oil gathering systems. SUBSTANCE: OLASOL T2P corrosion inhibitor is produced by mixing of pitch concentrate with fat acids of tall oil and addition of ethylene diamine, and condensation in two stages. The first stage is continued for 1 h at temperature of 100 C, and the second stage, for 2 h at temperature of 125-135 C. Introduced into condensation product is aromatic solvent and acetone. Produced mixture is held at temperature of not in excess of 60 C for 1 h and again, added with aromatic solvent. Obtained inhibitor is in form of movable liquid with freezing point of not above minus 45 C. Inhibitor forms on metal surface a protective phase film featuring high protective efficiency (above 85%) and appreciable aftereffect. EFFECT: higher efficiency. 2 tbl, 1 ex