High temperature acidizing corrosion inhibitor and preparation method thereof

An acidifying corrosion inhibitor, high temperature technology, used in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. The effective concentration of propargyl alcohol and other issues can achieve the effects of good acid solubility, significant corrosion inhibition effect and safe use.

Active Publication Date: 2010-11-24
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since propynyl alcohol is simply compounded into nitrogen-containing compounds, it cannot maximize the corrosion-inhibiting performance of propynyl alcohol
In addition, due to the high volatility of propynyl alcohol, after being added to the a...

Method used

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  • High temperature acidizing corrosion inhibitor and preparation method thereof
  • High temperature acidizing corrosion inhibitor and preparation method thereof
  • High temperature acidizing corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Put 56 grams of propynyl alcohol, 30 grams of paraformaldehyde, and 107 grams of N-methylaniline into a three-necked flask equipped with a stirring and condensing device, and simultaneously use glacial acetic acid to adjust the pH value to 2-3. Turn on the condensing device and start heating and stirring the reaction. When the reaction temperature reaches 100°C, keep the temperature at reflux for 8 hours to obtain about 190 grams of Mannich base, slowly add 127 grams of benzyl chloride dropwise to the generated Mannich base, keep the temperature at 100°C, and continue the reaction for 5 Hour, obtain the Mannich base quaternary ammonium salt of following formula:

[0034]

[0035] Stir and mix 50 grams of the above-mentioned Mannich base quaternary ammonium salt, 20 grams of dimethylformamide and 30 grams of isopropanol to obtain 100 grams of high-temperature acidification corrosion inhibitor.

[0036] Sustained release performance evaluation:

[0037] The industry ...

Embodiment 2

[0043] 84 grams of pentynyl alcohol, 75 grams of formalin aqueous solution (concentration is 40%), and 73 grams of diethylamine were put into a three-necked flask equipped with a stirring and condensing device, while glacial acetic acid was used to adjust the pH value to 2-3. Turn on the condensing device and start heating and stirring the reaction. When the reaction temperature reaches 100°C, keep the temperature at reflux for 8 hours to obtain about 200 grams of Mannich base, slowly add 126 grams of benzyl chloride dropwise to the generated Mannich base, keep the temperature at 100°C, and continue the reaction 5 hours, obtain the Mannich base quaternary ammonium salt of following formula:

[0044]

[0045] Stir and mix 55 grams of the above-mentioned Mannich base quaternary ammonium salt, 15 grams of dimethylformamide and 30 grams of isopropanol to obtain 100 grams of high-temperature acidification corrosion inhibitor.

[0046] Table 2

[0047]

[0048] It can be see...

Embodiment 3

[0050]Put 98 grams of hexynol, 75 grams of formalin aqueous solution (concentration of 40%) and 107 grams of N-methylaniline into a three-necked flask equipped with a stirring and condensing device, while using glacial acetic acid to adjust the pH value to 2-3. Turn on the condensing device and start heating and stirring the reaction. When the reaction temperature reaches 100°C, keep the temperature at reflux for 8 hours to obtain about 250 grams of Mannich base, slowly add 94 grams of chloroacetic acid dropwise to the generated Mannich base, keep the temperature at 100°C, and continue the reaction for 5 hours. A Mannich base quaternary ammonium salt of the formula is obtained:

[0051]

[0052] Stir and mix 60 grams of the above-mentioned Mannich base quaternary ammonium salt, 20 grams of dimethylformamide and 20 grams of isopropanol to obtain 100 grams of high-temperature acidification corrosion inhibitor.

[0053] table 3

[0054]

[0055] It can be seen from the da...

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Abstract

The invention relates to a high temperature acidizing corrosion inhibitor. The corrosion inhibitor consists of 45 to 60 weight parts of mannich base quaternary ammonium salt, 15 to 30 weight parts of dimethylformamide and 20 to 35 weight parts of isopropanol, wherein the mannich base quaternary ammonium salt has a structural formula shown as a formula (I); n is an integer of 0 to 3; R is a low alkyl group substituted phenyl group, a low alkyl group substituted carboxyl group and low alkyl group substituted hydroxyl group; and R1 and R2 are the low alkyl group and the low phenyl group respectively. The invention also relates to a method for preparing the high temperature acidizing corrosion inhibitor. The high temperature acidizing corrosion inhibitor is used as a corrosion inhibitor in oil field exploitation.

Description

technical field [0001] The invention relates to an acidification corrosion inhibitor and a preparation method thereof, in particular to a high-temperature acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] With the deepening of oil and gas field exploitation, more and more high-temperature wells begin to appear, which requires higher and higher requirements for acidizing corrosion inhibitors. [0003] At present, the main body of acidifying corrosion inhibitors is mostly nitrogen-containing organic compounds, such as pyridine, quinoline quaternary ammonium salt, ketoaldehyde amine condensate, etc., their acid solubility is poor, and the addition amount is relatively large, and the addition concentration in the acid solution Precipitation is prone to occur when it is higher. [0004] On the other hand, in order to make the acidification corrosion inhibitor meet the anticorrosion requirements at high temperature, propynyl alcohol...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/54
Inventor 刘刚芝彭雪飞王贵冯浦涌胡红福杨永庆金邦能
Owner CHINA NAT OFFSHORE OIL CORP
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