Abstract: 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/(m2h), and it achieves the first level standard.
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Key words: gelled acid, compound corrosion inhibitor, corrosion rate, inhibitor efficiency