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Mannich base acidizing corrosion inhibitor and preparation method thereof

An acidification corrosion inhibitor and Mannich base technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of poor solubility, dispersion and slow release, and achieve excellent high temperature resistance and Highlight, promote adsorption, and promote the effect of dissolution and dispersibility

Active Publication Date: 2020-04-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a Mannich base acidification corrosion inhibitor and its preparation method, to solve the problems of the existing Mannich base corrosion inhibitors with poor solubility, dispersibility and slow-release type, especially in high temperature environment The problem of poor solubility, dispersibility and sustained release

Method used

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  • Mannich base acidizing corrosion inhibitor and preparation method thereof
  • Mannich base acidizing corrosion inhibitor and preparation method thereof
  • Mannich base acidizing corrosion inhibitor and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0029] The structural formula of the Mannich base acidification corrosion inhibitor of the present embodiment is as follows:

[0030]

[0031] Its preparation process route is:

[0032]

[0033] The preparation method of the Mannich base acidification corrosion inhibitor of the present embodiment comprises the following steps:

[0034] (1) Put 30g of paraformaldehyde into a 1000ml three-necked flask, add 100ml of ethanol and stir; take 88g of N,N-dimethylethylenediamine, dissolve it in 50ml of ethanol, slowly drop it into the flask, and heat up to 60°C React for 2 hours; add concentrated hydrochloric acid to the flask to adjust the pH to 2-3, add 120 g of acetophenone, raise the temperature to 80° C. and react for 8-12 hours to obtain a dark brown liquid that is Mannich base solution.

[0035] (2) After the above liquid is cooled to room temperature, add an appropriate amount of 30% sodium hydroxide solution to adjust the pH of the solution to 8-9, add 253g of benzyl ch...

Embodiment 2

[0043] The structural formula of the Mannich base acidification corrosion inhibitor of the present embodiment is as follows:

[0044]

[0045] Its preparation process route is:

[0046]

[0047] The preparation method of the Mannich base acidification corrosion inhibitor of the present embodiment comprises the following steps:

[0048] (1) Put 30g of paraformaldehyde into a 1000ml three-neck flask, add 100ml of ethanol and stir; take 88g of N,N-dimethylethylenediamine, dissolve it in 50ml of ethanol, slowly drop it into the flask, and heat up to 60°C React for 2 hours; add concentrated hydrochloric acid to the flask to adjust the pH to 2-3, add 120 g of acetophenone, raise the temperature to 80° C. and react for 8-12 hours to obtain a dark brown liquid that is Mannich base solution.

[0049] (2) After the above liquid is cooled to room temperature, add an appropriate amount of 30% sodium hydroxide solution to adjust the pH of the solution to 8-9, add 353g of 2-(chlorome...

Embodiment 3

[0057] The structural formula of the Mannich base acidification corrosion inhibitor of the present embodiment is as follows:

[0058]

[0059] Its preparation process route is:

[0060]

[0061] The preparation method of the Mannich base acidification corrosion inhibitor of the present embodiment comprises the following steps:

[0062] (1) Put 30g of paraformaldehyde into a 1000ml three-necked flask, add 100ml of ethanol and stir; take 88g of N,N-dimethylethylenediamine, dissolve it in 50ml of ethanol, slowly drop it into the flask, and heat up to 60°C React for 2 hours; add concentrated hydrochloric acid to the flask to adjust the pH to 2-3, add 120 g of acetophenone, raise the temperature to 80° C. and react for 8-12 hours to obtain a dark brown liquid that is Mannich base solution.

[0063] (2) After the above liquid is cooled to room temperature, add an appropriate amount of 30% sodium hydroxide solution to adjust the pH of the solution to 8-9, add 453g of 9-chlorom...

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Abstract

The invention discloses a Mannich base acidizing corrosion inhibitor and a preparation method thereof, and belongs to the technical field of corrosion inhibitor preparation. A two-step synthesis process is adopted. Firstly, paraformaldehyde, N,N-dimethyl ethylenediamine and acetophenone are subjected to a Mannich base reaction, and then benzyl chloride, 2-(chloromethyl)naphthalene or 9-chloromethyl anthracene are added to perform a quaternization reaction. Problems of excessive by-products and incomplete reaction are avoided and the yield of corrosion inhibitor products is improved. The prepared corrosion inhibitor has good solubility in an acid solution system, and can reach the first-class industry standard under the conditions of medium temperature and high temperature. A tested hangingpiece is flat in surface and free of obvious pitting corrosion, and the corrosion inhibitor has a good inhibitory effect on uniform corrosion and local corrosion.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitor preparation, in particular to a Mannich base acidification corrosion inhibitor emergency agent and a preparation method thereof. Background technique [0002] Acidizing is an effective measure to increase the production of oil and gas wells in the process of oil and gas field development. Using the chemical dissolution of acid liquid can effectively remove the pollution near the wellbore, expand or extend reservoir fractures, effectively restore and improve reservoir permeability, reduce reservoir The flow resistance of layer fluid can be reduced, so as to achieve the purpose of increasing production and injection of oil and gas wells. Although the acidizing technology of oil and gas wells can increase the production of oil and gas wells, during the acidizing process, the acid liquid will cause corrosion of oil and gas well pipe strings and downhole metal equipment, shorten the service...

Claims

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Application Information

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IPC IPC(8): C09K8/74C07C225/16C07C221/00
CPCC09K8/74C07C225/16C07C2603/24
Inventor 毛金成张恒杨小江林冲韩涤非
Owner SOUTHWEST PETROLEUM UNIV
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