Mannich base type acidizing corrosion inhibitor and preparation method thereof

Abstract

The invention relates to a mannich base type acidizing corrosion inhibitor and a preparation method thereof. The mannich base type acidizing corrosion inhibitor is characterized by being prepared from the following components in percentage by mass: 25-30% of a host corrosion inhibitor, 30-45% of an organic solvent and 30-40% of water. The preparation method comprises the following steps: (1) adding 2-mercaptobenzothiazole and benzaldehyde, or 2-mercaptobenzothiazole and furfural or 2-mercaptobenzothiazole and cinnamyl aldehyde in a mole ratio of 1.0:(1.0-1.8) as a host corrosion inhibitor raw material into ethanol, mechanically stirring, slowly dropping adding phenylamine, adjusting the pH value of the solution to be 2-4, implementing reaction for 4-10 hours at 75-90 DEG C, and cooling to be the room temperature, thereby synthesizing a host corrosion inhibitor mannich base compound; and (2) dissolving the host corrosion inhibitor in an organic solvent according to a ratio, and uniformly mixing and stirring with water, thereby obtaining the mannich base type acidizing corrosion inhibitor. As synthesized raw materials which are environment-friendly, low in toxicity and easy to degrade are adopted, the acidizing corrosion inhibitor provided by the invention can effectively prevent corrosion of an acid liquid to metal, and has the characteristics of simple synthesis method, safe production and operation, stable and remarkable corrosion inhibition property, low cost and environment friendliness.

Description

Technical field: [0001] The invention relates to a Mannich base type acidification corrosion inhibitor and a preparation method thereof, belonging to the technical field of chemical anticorrosion application in oil and gas field exploitation. Background technique: [0002] With the deepening of the development of oil and gas fields in my country, most oil and gas fields need to rely on acidizing process to treat the formation in the process of exploitation, so as to improve the recovery rate of oil and gas wells and realize the increase and stability of oil and gas well production. The acidizing process of oil and gas wells refers to the injection of a certain amount of acid liquid into the formation by mechanical means, the flow and reaction of the acid liquid in the intercrystals, cavities and micro-cracks of the formation voids, and the dissolution of the clogging substances in the formation near the bottom of the well. And certain components in formation rocks, expand oi...

AI Technical Summary

Problems solved by technology

At present, there are few varieties of high-temperature hydrochloric acid corrosion inhibitors used in China, and the performance of most corrosion inhibitor products is not stable, and the cost is high, which is far from meeting the actual needs of current oil and gas field development.

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