A kind of organic acid system Mannich base acidification corrosion inhibitor and preparation method thereof

A technology of Mannich bases and acidizing corrosion inhibitors, applied in the direction of organic chemistry, etc., to achieve the effect of preventing corrosion, fast film formation, and easy to achieve

Active Publication Date: 2020-06-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main ingredients of the patented acidifying corrosion inhibitor and its preparation method (CN201410284220.1) and an acidizing corrosion inhibitor and its preparation and application (CN201310416383) are Mannich bases, but they are all aimed at inorganic acid corrosion. No examples for 10% HCl + 10% HEDP (hydroxyethylidene diphosphonic acid)

Method used

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  • A kind of organic acid system Mannich base acidification corrosion inhibitor and preparation method thereof
  • A kind of organic acid system Mannich base acidification corrosion inhibitor and preparation method thereof
  • A kind of organic acid system Mannich base acidification corrosion inhibitor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0048] In this example, the preparation of the organic acid system Mannich base acidifying corrosion inhibitor is divided into two steps: the first step is the synthesis of the main agent, phenmimidazole Mannich base, and the second step is the preparation of the corrosion inhibitor.

[0049] Add benzoimazole, paraformaldehyde, and diethylamine into a three-necked flask at a molar ratio of 1:1.5:1, then add toluene and mix well, use hydrochloric acid with a mass concentration of 30% as a catalyst to adjust the pH value of the solution between 2 and 3 Between, be warming up to toluene reflux temperature again, insulation reaction 6 hours, obtain phentermine Mannich base;

[0050]Then, according to mass percentage, 25% of Mannich base of benzoimidazole, 15% of ammonium thiocyanate, 3% of propynyl alcohol, MOA-76% and 51% of dimethylformamide were uniformly mixed to obtain the organic acid system Mannich Nische base acidification corrosion inhibitor, code name TG203-1.

Embodiment 2

[0052] Add benzoimazole, paraformaldehyde, and dipropylamine into a three-necked flask at a molar ratio of 1:1.4:1, then add toluene and mix well, and use industrial acetic acid with a mass concentration of 75% as a catalyst to adjust the pH value of the solution between 2 and 3. Between, be warming up to toluene reflux temperature again, insulation reaction 6 hours, obtain phentermine Mannich base;

[0053] Then, in terms of mass percentage, 30% of phenylbenzimidazole Mannich base, 10% of ammonium thiocyanate, 3% of butynediol, 10% of MOA-9 and 47% of dimethylformamide were uniformly mixed to obtain an organic acid system Mannich base acidification corrosion inhibitor, code name TG203-2.

Embodiment 3

[0055] Add benzoimazole, paraformaldehyde, and dibutylamine into a three-necked flask at a molar ratio of 1:1.2:1, then add toluene and mix evenly, use hydrochloric acid with a mass concentration of 30% as a catalyst to adjust the pH value of the solution between 2 and 3 Between, be warming up to toluene reflux temperature again, insulation reaction 6 hours, obtain phentermine Mannich base;

[0056] Then, according to mass percentage, 20% of Mannich base of benzoimidazole, 15% of ammonium thiocyanate, 3% of butynediol, 95% of MOA-95% and 57% of isopropanol were uniformly mixed to obtain the organic acid system Mannich Greek alkali acidification corrosion inhibitor, code name TG203-3.

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Abstract

The invention relates to a Mannich base acidizing corrosion inhibitor for an organic acid system, and a preparation method of the Mannich base acidizing corrosion inhibitor. The method comprises the steps of adding benzimidazole, aldehyde and organic amine into a container according molar ratio of 1 to (1.2-1.5) to 1, then adding toluene and mixing uniformly, and adjusting the pH value to 2-3 by using a catalyst; then, heating up to a reflux temperature of the toluene, and carrying out a reaction for 6h under the condition of heat preservation so as to obtain benzimidazole Mannich base; evenlymixing the following materials by mass percent: 10-15% of thiocyanate, 3-5% of alkynol, 5-10% of a surfactant, 40-62% of a solvent and 20-30% of the benzimidazole Mannich base so as to obtain the Mannich base acidizing corrosion inhibitor for the organic acid system. The Mannich base acidizing corrosion inhibitor for the organic acid system has an excellent protection effect on carbon steel oil pipes and equipment in a strong acid environment. The product solves the problem of corrosion of the organic acid system in an acidizing fracturing operation process, thus achieving the aim of protecting the oil pipes.

Description

technical field [0001] The invention belongs to the protection of oil and gas well pipelines and equipment in the petroleum and petrochemical field, and in particular relates to an organic acid system Mannich base acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] In the acidizing of oil and gas wells, especially in the acidizing of concentrated hydrochloric acid or deep wells with a large amount of acid, the primary task is to solve the problem of corrosion of the oil well casing equipment by the acidizing fluid. [0003] As early as the end of the 1960s, the former Soviet Union reported the effects of different corrosion inhibitor formulations on steel in hydrochloric acid in the article "The protective effect of nitrogen-containing and alkyne-containing corrosion inhibitors on certain steels in hydrochloric acid" Corrosion inhibition test in 4N HCl solution at 110-250°C, Table 1 shows the test results. It can be seen from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D235/06C23F11/10C23F11/14
CPCC07D235/06C23F11/10C23F11/149
Inventor 张娟涛李循迹尹成先王福善张小龙胡建国马磊宋文文熊茂县
Owner BC P INC CHINA NAT PETROLEUM CORP
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