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A kind of Mannich base type acidification corrosion inhibitor and preparation method thereof

A technology of acidifying corrosion inhibitor and Mannich base, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., and can solve the problems of high cost, unstable corrosion inhibitor performance, and few varieties , to achieve the effect of low cost, stable and significant corrosion inhibition performance, and improved reaction energy barrier

Inactive Publication Date: 2017-08-29
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • A kind of Mannich base type acidification corrosion inhibitor and preparation method thereof
  • A kind of Mannich base type acidification corrosion inhibitor and preparation method thereof
  • A kind of Mannich base type acidification corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 8.4g of 2-mercaptobenzothiazole, 5.3g of benzaldehyde and 24.4g of ethanol and put it into a three-necked flask, then slowly add 3.7g of aniline, stir well, adjust the pH to 2~3 with hydrochloric acid, at 80~85℃ The reaction was carried out for 7 hours, and the Mannich base compound could be obtained after the system was cooled. Wherein the molecular formula of the Mannich base compound is:

[0030]

Embodiment 2

[0032] Mix 8.4g of 2-mercaptobenzothiazole, 6.7g of furfural and 29.7g of ethanol and put it into a three-necked flask, then slowly add 4.7g of aniline, stir well, adjust the pH to 3~4 with hydrochloric acid, at 80~90℃ After reacting for 9 hours, the Mannich base compound can be obtained after the system is cooled. Wherein the molecular formula of the Mannich base compound is:

[0033]

Embodiment 3

[0035] Mix 8.4g of 2-mercaptobenzothiazole, 10.6g of cinnamaldehyde and 24.6g of ethanol and put it into a three-necked flask, then slowly add 5.6g of aniline, stir evenly, adjust the pH to 2~3 with hydrochloric acid, and set the temperature at 75~85℃ The reaction was carried out for 10 hours, and the Mannich base compound could be obtained after the system was cooled. Wherein the molecular formula of the Mannich base compound is:

[0036]

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/54
CPCC09K8/54C09K8/74C09K2208/32
Inventor 李克华兰志威王任芳杨冰冰
Owner YANGTZE UNIVERSITY
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