Corrosion inhibitor based on benzimidazole derivatives as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of acidification and simulation of oil wells, and discloses a corrosion inhibitor based on benzimidazole derivatives as well as a preparation method and application thereof. The corrosion inhibitor based on the benzimidazole derivative consists of 2-(4-methoxyphenyl)-1H benzimidazoles and 2-phenyl-1H-benzimidazole in a molar ratio of 1 to 1. The preparation method of the corrosion inhibitor based on the benzimidazole derivatives comprises the following steps: synthesizing the benzimidazole derivatives in a round-bottom flask based on that the molarratio of 2-(4-methoxyphenyl)-1H benzimidazoles and 2-phenyl-1H-benzimidazole is 1 to 1; stimulating 2mol of aromatic aldehyde, 2mol of o-phenylenediamine, 0.1g of boracic acid and 1ml of water for 15minutes to 30 minutes at a room temperature; and adding 5ml of water after reaction is carried out completely, and then stirring for 10 minutes to obtain precipitants; filtering from ethanol and performing re-crystallizing E. The corrosion inhibitor disclosed by the invention has the advantages that a human body is not destroyed, and a green and chemical value theory is met; the efficiency is high, the corrosion inhibition effect is good, the using concentration is low; the corrosion inhibition effect is up to 95 percent or above; raw materials are cheap and easy to get, and the cost is low; and the corrosion inhibitor has biological and pharmacoligical activities.

Description

technical field [0001] The invention belongs to the technical field of oil well acidification simulation, and in particular relates to a corrosion inhibitor based on benzimidazole derivatives and a preparation method and application thereof. Background technique [0002] At present, the closest existing technology: the prior art mainly adopts ammoniation and emulsion polymerization. The defect of this method is that the emulsifier in the system is not easy to remove. Low oxidizing agents are used as initiators. In petroleum production technology, well simulation or acidizing involves introducing an acidic solution into an oil well, usually under high pressure. As the well depth increases, thermal decomposition leads to a decrease in corrosion inhibitor performance. In order to collect the effect of temperature increase on the corrosion rate of N80 steel in 15% HCl at 30, 50, 70 and 90 °C, the corrosion of N80 steel with no BZs and optimal BZs concentration was studied spe...

AI Technical Summary

Problems solved by technology

[0003] In summary, the existing problems in the prior art are: there are many intermediate steps in the ammoniation and emulsion polymerization methods used in the prior art, resulting in many pollutants, and the additives are not easy to remove

[0005] The significance of solving the above technical problems: In order to solve the serious corrosion of equipment and pipelines caused by oilfield sewage, an economical and practical method for synthesizing corrosion inhibitors is provided in the process of oilfield sewage treatment

Images