RESEARCH AND EVALUATION ON CORROSION INHIBITING SYSTEM OF ACIDIZING AT HIGH PRESSURE

A compound corrosion inhibiting system was formed by mixing acetylenic alcohol, solvent, surfactant and enhancing corrosion inhibition agent in a certain proportion and its performance of corrosion inhibition as also evaluated. The result showed that at high pressure, 120℃, in 20% hydrochloric acid, 2% corrosion inhibiting system could make the corrosion rate of N80 steel decrease from 2001.3 to 10.53 g/(m 2·h)and in 15% conventional mud acid, 2% 2% corrosion inhibiting system could make the corrosion rate of N80 steel decrease from 1899.9 to 8.08 g/(m 2·h). The corrosion rates in the two kinds of acid all achieved the first standard and the effect of corrosion inhibition system were quite prefect. In addition the corrosion inhibiting system could dissolve in the acid well and after the reaction with the N08 steel, there is no deposition induced. The compatibleness of the mixtures with other acid additives was also well.