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Corrosion inhibitor suitable for delivery pipeline in H2S/CO2-containing corrosive environment of oil and gas field and preparation method of corrosion inhibitor

A technology for corrosive environment and transportation pipeline, which is applied in the field of corrosion inhibitor and preparation field of transportation pipeline in corrosive environment containing H2S/CO2 in oil and gas fields, can solve the problem that pipeline steel cannot achieve corrosion inhibition effect, etc. The effect of high corrosion inhibition efficiency

Active Publication Date: 2016-04-13
中国石油集团石油管工程技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these corrosion inhibitors at higher H 2 Under the partial pressure of S, it cannot achieve a good corrosion inhibition effect on domestic pipeline steel

Method used

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  • Corrosion inhibitor suitable for delivery pipeline in H2S/CO2-containing corrosive environment of oil and gas field and preparation method of corrosion inhibitor
  • Corrosion inhibitor suitable for delivery pipeline in H2S/CO2-containing corrosive environment of oil and gas field and preparation method of corrosion inhibitor
  • Corrosion inhibitor suitable for delivery pipeline in H2S/CO2-containing corrosive environment of oil and gas field and preparation method of corrosion inhibitor

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preparation example Construction

[0020] While the present invention provides the above-mentioned corrosion inhibitor formula, it also provides a kind of H2-containing corrosion inhibitor based on the above that is suitable for oil and gas fields. 2 S / CO 2 A method for preparing a corrosion inhibitor for a pipeline in a corrosive environment, the preparation method comprising the following steps:

[0021] 1) Synthesis of propynyl alcohol Mannich base quaternary ammonium salt:

[0022] 1.1) Add propynyl alcohol, benzene, and paraformaldehyde into a three-necked flask equipped with a water separator, heat up to 60°C and stir for 30 minutes, then add dodecylamine dropwise at a rate of 1-2 drops per second; After the addition, heat up to reflux temperature of 80°C and start reflux; the molar ratio of propynyl alcohol, paraformaldehyde, dodecylamine and benzene is 2:2:1:5; when the moisture separated from the anti-water separator reaches the theoretical When the amount of water or the separated moisture is consta...

Embodiment 1

[0029] 1) Synthesis of dodecylamine propynyl alcohol Mannich base quaternary ammonium salt:

[0030] Add 100ml of solvent benzene, 33.6g of propynyl alcohol, and 18g of paraformaldehyde into a three-neck flask (equipped with a water separator), and then raise the temperature to 60°C. After reacting for 30 minutes, weigh 55.7g of dodecylamine, and use drops Slowly add amine to the liquid funnel. After the drop is completed, heat up and reflux for reaction until the water separated from the water separator reaches the theoretical water amount or when the separated water is constant, the reaction is completed. After cooling down, the solvent in the product is distilled off under reduced pressure. Benzene to give the corresponding Mannich base. Add 38g of benzyl chloride to the flask again, control the temperature at about 90°C for a constant reaction for 20-25 hours, and cool down to obtain the quaternary ammonium salt of dodecylamine propynyl alcohol Mannich base, see figure 1 ...

Embodiment 2

[0035] Take 25% of dodecylamine propynyl alcohol Mannich base quaternary ammonium salt by mass ratio, add 30.5% ethanol, add 19% of 8-hydroxyquinoline quaternary ammonium salt after stirring, add fatty alcohol polyoxyethylene ether successively after stirring Phosphate potassium salt 14%, 2-ethylaminoethanol 10%, Tween 1.5%, stir evenly to obtain the corrosion inhibitor.

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Abstract

The invention relates to the field of oil field chemical engineering, in particular to a corrosion inhibitor suitable for a delivery pipeline in a H2S / CO2-containing corrosive environment of an oil and gas field and a preparation method of the corrosion inhibitor. The corrosion inhibitor is prepared from, by mass percentage, 20% to 30% of propargyl alcohol Mannich base quaternary ammonium salt, 15% to 20% of 8-hydroxyquinoline, 10% to 17% of fatty alcohol-polyoxyethylene ether phosphate sylvite, 5% to 12% of 2-ethylethanolamine, 1% to 2% of an emulsifying agent and 30% to 35% of a solvent. By the adoption of the corrosion inhibitor, corrosion of H2S, CO2 and Cl- systems can be reduced, and the corrosion inhibitor can be used for corrosion resistance in a gathering pipeline and equipment; corrosion of H2S / CO2 / CO2-H2S-H2O systems can be inhibited, the metal pipeline and the equipment are effectively protected in the high-salinity sewage environment containing CO2 and H2S; and the corrosion inhibitor has the characteristics of being small in use amount, high in corrosion inhibition efficiency, easy and convenient to prepare, low in cost and the like in the industrial production and application processes.

Description

technical field [0001] The invention relates to the field of oilfield chemical industry, in particular to a 2 S / CO 2 Corrosion inhibitor and preparation method, especially relate to a kind of suitable for oil and gas field containing H 2 S / CO 2 A corrosion inhibitor for pipelines in corrosive environments and a preparation method thereof. Background technique [0002] With the large-scale development of oil and gas fields, the CO 2 and / or H 2 S corrosion problem is becoming more and more serious, CO 2 and / or H 2 S is the main corrosive gas in the oil and gas industry. They dissolve in water to form weak acids, which cause serious corrosion to oil and natural gas mining, refining, and gathering and transportation equipment, resulting in a greatly reduced service life of the equipment. Oil casing and gathering pipelines contain CO 2 、H 2 S and Cl - If the corresponding protective measures are not taken, corrosion and perforation are prone to occur, resulting in the p...

Claims

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Application Information

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IPC IPC(8): C23F11/04
CPCC23F11/04
Inventor 王远张娟涛田峰刘强罗金恒武刚白强
Owner 中国石油集团石油管工程技术研究院
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