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Corrosion inhibitor for controlling corrosion of high-concentration hydrogen sulfide in acid liquor medium and preparation method thereof

A corrosion inhibitor and high-concentration technology, applied in earthwork drilling, organic chemistry, wellbore/well components, etc., can solve the problems of unsatisfactory hydrogen stress corrosion effects, achieve excellent corrosion inhibition performance, enhance adsorption capacity, combine good effect

Inactive Publication Date: 2011-09-14
YANGTZE UNIVERSITY
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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 kind of having higher corrosion inhibition performance and better water-solubility, have better biological activity again at the same time, to solve existing corrosion inhibitor or only for acid corrosion; Or only for acid corrosion h 2 S corrosion works, and the effect on hydrogen damage and stress corrosion is not ideal. It can reduce the corrosion of oil and gas well acidification process, and improve the service life of downhole pipes and equipment. Corrosion inhibitor for controlling high concentration hydrogen sulfide corrosion in acid liquid medium and its preparation method

Method used

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  • Corrosion inhibitor for controlling corrosion of high-concentration hydrogen sulfide in acid liquor medium and preparation method thereof
  • Corrosion inhibitor for controlling corrosion of high-concentration hydrogen sulfide in acid liquor medium and preparation method thereof
  • Corrosion inhibitor for controlling corrosion of high-concentration hydrogen sulfide in acid liquor medium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The first step: Synthesis of 2-amino-5-methylthiazole:

[0044] Add 73.6g of n-propanol and 3.2g of water into a 250mL three-necked bottle equipped with a thermometer, stirrer, air guide tube, tail gas tube and an alkali absorption bottle, weigh and record. At 10°C (if necessary, cool with water or ice water), slowly introduce chlorine gas, and start the stirrer to stir. When the weight of the three-necked bottle reaches 24.5g-49g, stop the chlorine gas flow. The cumulative time for chlorine gas injection is From 2h to 4h, the amount of chlorine gas introduced is 1 / 3mol. Separate the heavy layer, add 10.5 g of a mixture of thiourea and water with a weight ratio of 2.5:1, heat up to 60-90°C and heat to reflux, and simultaneously use copper sulfate test solution or thin-layer chromatography to detect the reaction. The reaction time is about 4 After ~5h, propanol was recovered by distillation, and an oily substance was obtained in the three-necked flask. Add 2.1 g of wat...

Embodiment 2

[0051] The first step: Synthesis of 2-amino-5-methylthiazole:

[0052] Add 73.6g of n-propanol and 3.2g of water into a 250mL three-necked bottle equipped with a thermometer, stirrer, air guide tube, tail gas tube and an alkali absorption bottle, weigh and record. At 10°C (if necessary, cool with water or ice water), slowly introduce chlorine gas, and start the stirrer to stir. When the weight of the three-necked bottle reaches 24.5g-49g, stop the chlorine gas flow. The cumulative time for chlorine gas injection is From 2h to 4h, the amount of chlorine gas introduced is 1 / 3mol. Separate the heavy layer, add 10.5 g of a mixture of thiourea and water with a weight ratio of 2.5:1, heat up to 60-90°C and heat to reflux, and simultaneously use copper sulfate test solution or thin-layer chromatography to detect the reaction. The reaction time is about 4 After ~5h, propanol was recovered by distillation, and an oily substance was obtained in the three-necked flask. Add 2.1 g of wat...

Embodiment 3

[0058] The first step: Synthesis of 2-amino-5-methylthiazole:

[0059] Add 73.6g of n-propanol and 3.2g of water into a 250mL three-necked bottle equipped with a thermometer, stirrer, air guide tube, tail gas tube and an alkali absorption bottle, weigh and record. At 10°C (if necessary, cool with water or ice water), slowly introduce chlorine gas, and start the stirrer to stir. When the weight of the three-necked bottle reaches 24.5g-49g, stop the chlorine gas flow. The cumulative time for chlorine gas injection is From 2h to 4h, the amount of chlorine gas introduced is 1 / 3mol. Separate the heavy layer, add 10.5 g of a mixture of thiourea and water with a weight ratio of 2.5:1, heat up to 60-90°C and heat to reflux, and simultaneously use copper sulfate test solution or thin-layer chromatography to detect the reaction. The reaction time is about 4 After ~5h, propanol was recovered by distillation, and an oily substance was obtained in the three-necked flask. Add 2.1 g of wat...

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Abstract

The invention relates to a corrosion inhibitor for controlling corrosion of high-concentration hydrogen sulfide in an acid liquor medium and a preparation method thereof, which belong to the technical field of mechanically chemical preparation. In the invention, a corrosion inhibitor finished product is prepared by synthesizing 2-amino-5-methylthiazol, synthesizing 2-amino(1,4- diphenyl-3-oxobutyl)-5-methylthiazol and brominating 2-amino(1,4-diphenyl-3-oxobutyl)-5-methylthiazol; the corrosion inhibitor contains a thiazole ring; atoms S and atoms N on the thiazole ring form multiple adsorptioncenters with the metal surface and are directly adsorbed to the metal surface, so as to enhance the adsorbing capacity of molecules; therefore, a better corrosion inhibition effect is obtained and the problems that the traditional corrosion inhibitor only works on acid corrosion or only works on H2S corrosion and the effects on hydrogen damage and stress corrosion are not ideal are solved; and the corrosion inhibition rate of the corrosion inhibitor provided by the invention in a hydrochloric acid medium can reach up to 96% while the corrosion inhibition rate in a mud acid medium can be more than 92%.

Description

Technical field: [0001] The invention relates to a corrosion inhibitor for controlling high-concentration hydrogen sulfide corrosion in acid liquid medium and a preparation method thereof, belonging to the technical field of organic chemical preparation. Background technique: [0002] h 2 S (hydrogen sulfide) exists in oil and gas as an associated component of oil and natural gas, and is extremely corrosive to metal materials (especially low carbon steel and stainless steel) after being dissolved in water. by the high concentration of H 2 The corrosion of metal materials caused by S occurs from time to time in the process of oil and gas exploitation at home and abroad, which not only causes huge economic losses, but also threatens the life safety of workers during mining, and brings immeasurable social consequences. high concentration of H 2 S corrosion and protection is a key technical problem to be solved in oil and gas development. h 2 When S exists alone, due to the...

Claims

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Application Information

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IPC IPC(8): C09K8/54C07D277/42C23F11/04C23F11/16
Inventor 艾俊哲梅平陈武
Owner YANGTZE UNIVERSITY
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