A NEW CORROSION INHIBITOR FOR GELLED ACID

The corrosion inhibitor is a very important additive in the acid fluid. Aiming at the corrosion of gelled acid to the tubing, casing and well equipment, the inhibiting effect of a series of single corrosion inhibitor have been studied, and a compound corrosion inhibitor NKJ used in high temperature has been developed. The result of the static corrosion experiment indicates that the inhibitor efficiency of the compound corrosion inhibitor is 98.0% in the gelled acid at 90℃ and the concentration of hydrochloric acid in the gelled acid is 20%, and it achieves the third level standard. The result of the dynamic experiment under high temperature and pressure indicates that the average corrosion rate of the corrosion inhibitor is 28.96 g/(m2·h), and it achieves the first level standard.