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Corrosion inhibitor for inhibiting corrosion of high-temperature high-pressure carbon dioxide and preparation method thereof

A carbon dioxide, high temperature and high pressure technology, applied in the field of corrosion inhibitor and its preparation, can solve the problems of poor effect and high concentration of use, and achieve the effect of less use, corrosion prevention and high effect

Active Publication Date: 2011-05-25
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few corrosion inhibitors for high temperature and high carbon dioxide partial pressure corrosion in China, and there are problems such as high concentration and poor effect

Method used

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  • Corrosion inhibitor for inhibiting corrosion of high-temperature high-pressure carbon dioxide and preparation method thereof
  • Corrosion inhibitor for inhibiting corrosion of high-temperature high-pressure carbon dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example is used to prepare corrosive media.

[0037] Add 2 grams of sodium bicarbonate, 0.3 g of sodium sulfate, 0.2 g of calcium chloride, 0.2 g of magnesium chloride, and 13 g of sodium chloride into 1000 g of water, and stir to completely dissolve the sodium chloride to obtain a 3.0% by weight sodium chloride solution as a corrosive medium.

Embodiment 2

[0039] This example is used to prepare thioimidazolone derivatives

[0040] Put 120g of ethylenediamine and 40g of ethanol into a 500ml reaction kettle, and slowly add 160g of carbon disulfide dropwise at room temperature under the conditions of reflux condensation and stirring. After completion, turn on the power, heat to 60°C, and reflux for 10 hours. The obtained product was cooled in an ice bath, and the precipitate was washed with acetone to obtain a thioimidazolone derivative.

Embodiment 3

[0042] This example is used to prepare thioalkyl quaternary ammonium salt

[0043] Put 120g of octadecylamine, 50g of ethanol, and 60g of benzyl chloride into a 500ml reaction kettle. Under the condition of reflux condensation and stirring, react at 100°C for 4 hours, cool down, add 70g of ethanol solvent and stir, after cooling The product obtained is the alkyl quaternary ammonium salt.

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Abstract

The invention provides a corrosion inhibitor for inhibiting the corrosion of high-temperature high-pressure carbon dioxide and a preparation method thereof. The corrosion inhibitor comprises 1 to 80 weight percent of thioimidazolone derivative, 1 to 50 weight percent of quaternary alkylammonium salt, 0.01 to 20 weight percent of sulfur-containing low molecular weight organic matter, 0 to 70 weight percent of water, 0 to 30 weight percent of nonionic surfactant, 0 to 70 weight percent of solvent, and 1 to 20 weight percent of alkynol. The corrosion inhibitor has good effect of resisting the corrosion of the high-temperature high-pressure carbon dioxide, can form a layer of effective protective film on the surface of metal, prevent hypersalinity wastewater from corroding the metal at high temperature and high partial pressure of carbon dioxide, and can be used in oil wells with high temperature and high partial pressure of carbon dioxide.

Description

technical field [0001] The invention relates to a corrosion inhibitor for inhibiting high temperature and high pressure carbon dioxide corrosion and a preparation method thereof. It is especially suitable for inhibiting corrosion caused by high temperature and high pressure carbon dioxide. Background technique [0002] Carbon dioxide is often a component of natural gas or petroleum-associated gas and exists in oil and gas. CO 2 It is extremely corrosive to steel when dissolved in water. At the same pH value, the total acidity of carbon dioxide is higher than that of hydrochloric acid, and the corrosion of steel is more serious than that of hydrochloric acid. Carbon dioxide corrosion may make the life of oil and gas wells much lower than the design life, and the corrosion rate of low carbon steel can be as high as 7mm / a, sometimes even higher. In foreign countries, there have long been reports about CO 2 Case reports of rapid general corrosion and severe local corrosion ...

Claims

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Application Information

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IPC IPC(8): C23F11/16
Inventor 付朝阳郭兴蓬万雷鸣王峰刘长宇黄天杰
Owner HUAZHONG UNIV OF SCI & TECH
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