Study and development of a Mannich based corrosion inhibitor for hydrochloric acid acidifying

Mannich base is a kind of excellent corrosion inhibitors,and they are widely applied in the acidifying operations of oil-gas wells.A low-cost Mannich base is developed using cyclohexylamine as raw material.It may be used as the main agent for the oil or gas well acidifying corrosion inhibitor.Taking the static corrosion rate as the experimental appraisal target,the types of raw material are selected,and the influences of reaction temperature,reaction time,reaction system pH on the corrosion inhibiting performance of the products are studied.The synthesis technological conditions of the main agent of acidifying corrosion inhibitor are optimized,and the optimal synthesis technological conditions are obtained.The corrosion inhibiting performance of the synthesized corrosion inhibitor of different concentrations to N-80 steel is tested,and the coordinative effect of the main agent with synergists is discussed.The test result shows that,the first-grade corrosion inhibitor in petroleum and natural gas industry standards can be gained by adding the synthesized corrosion inhibitor of 0.5% into the industrial hydrochloric acid of 20% at 60 ℃.