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Preparation method of vegetable oil acid based imidazoline carbon dioxide corrosion inhibitor

The technology of vegetable oleic acid and imidazoline is applied in the field of preparation of vegetable oleic acid imidazoline carbon dioxide corrosion inhibitor, which can solve the problems of reduced corrosion inhibition efficiency and failure, and achieves the advantages of inhibiting metal corrosion, forming dense film and solving corrosion problems. Effect

Inactive Publication Date: 2015-08-19
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the problem that the corrosion inhibition efficiency in the existing method is greatly reduced or even fails, the invention provides a preparation method of a plant oleic acid-based imidazoline carbon dioxide corrosion inhibitor

Method used

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  • Preparation method of vegetable oil acid based imidazoline carbon dioxide corrosion inhibitor

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Experimental program
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Effect test

Embodiment 1

[0031] In order to overcome the problem that the corrosion inhibition efficiency of the corrosion inhibitor is greatly reduced or even becomes invalid in the existing method, the invention provides a preparation method of a plant oleic acid-based imidazoline carbon dioxide corrosion inhibitor. This corrosion inhibitor is a mixture of a modified imidazoline (oleic acid-based imidazoline quaternary amination derivative) and various additives, which solves the problem of carbon dioxide corrosion and inhibits the corrosion of carbon dioxide on production tubing and casing.

[0032] A plant oleic acid-based imidazoline carbon dioxide corrosion inhibitor is characterized in that: in weight percent, it consists of:

[0033] Vegetable oleic acid 20%~22%;

[0034] Amines 11%~12%;

[0035] Benzyl chloride 10%~15%;

[0036] Dehydrating agent 5%~6%;

[0037] Thiourea 8%;

[0038] Potassium iodide 4%;

[0039] The rest is water.

[0040] The vegetable oleic acid is palmitic ac...

Embodiment 2

[0060] Based on the basis of Example 1, in this example, the injection concentration of the corrosion inhibitor is selected as 100 mg / L.

[0061] In this example, the selected weight percentages are: vegetable oleic acid 20%, amines 11%, benzyl chloride 10%, dehydrating agent 6%, thiourea 8%, potassium iodide 4%, and the rest is water.

[0062] A preparation method of vegetable oleic acid-based imidazoline carbon dioxide corrosion inhibitor, put the raw material amines and dehydrating agent into the reaction kettle, start stirring and heat to 30°C, then slowly add the raw material vegetable oleic acid, gradually heat up to 120°C, and react for 0.5 h;

[0063] Until the generated water no longer increases, then gradually increase the temperature to 150°C. With the increase of water in the water separator, the reaction temperature finally rises to 200°C, no more water is generated, and the reaction is terminated;

[0064] The temperature of the reaction kettle was cooled to 110...

Embodiment 3

[0068] Based on the above two embodiments, the injection concentration of the corrosion inhibitor is selected to be 150 mg / L in this embodiment.

[0069] In this example, the selected weight percentages are: vegetable oleic acid 20%, amines 11%, benzyl chloride 10%, dehydrating agent 6%, thiourea 8%, potassium iodide 4%, and the rest is water.

[0070] A preparation method of vegetable oleic acid-based imidazoline carbon dioxide corrosion inhibitor, put the raw material amines and dehydrating agent into the reaction kettle, start stirring and heat to 30°C, then slowly add the raw material vegetable oleic acid, gradually heat up to 120°C, and react for 0.5 h;

[0071] Until the generated water no longer increases, then gradually increase the temperature to 150°C. With the increase of water in the water separator, the reaction temperature finally rises to 200°C, no more water is generated, and the reaction is terminated;

[0072] The temperature of the reaction kettle was coole...

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Abstract

The invention provides a preparation method of a vegetable oil acid based imidazoline carbon dioxide corrosion inhibitor. The vegetable oil acid based imidazoline carbon dioxide corrosion inhibitor is characterized by being prepared from the following components in percentage by weight: 20-22% of vegetable oil acid, 11%-12% of amine, 10%-15% of benzyl chloride, 5%-6% of dehydrant, 8% of thiourea, 4% of potassium iodide and 42%-33% of water. The corrosion inhibitor is mainly applied to inhibiting the corrosion of an oil pipe, a sleeve and the like caused by the carbon dioxide, and has the characteristics of low dosage, low corrosion rate, environmental friendliness and the like. The corrosion inhibitor is water-soluble, stable and easily soluble, compact in film forming, good in compatibility to other agents and strong in adsorptivity to metal surfaces. The corrosion inhibitor is applied to a produced liquid by 100mg / L vegetable oil acid based imidazoline carbon dioxide corrosion inhibitor so as to effectively inhibit metal corrosion, and the corrosion rate is smaller than 0.076mm / y.

Description

technical field [0001] The invention relates to the preparation of an oilfield chemical agent, which is mainly used for suppressing the corrosion of carbon dioxide on production oil pipes and casings in high-temperature downholes, and particularly relates to a preparation method of a plant oleic acid-based imidazoline carbon dioxide corrosion inhibitor. Background technique [0002] Carbon dioxide corrosion is one of the common types of corrosion in the oil and gas industry. Carbon dioxide dissolves in water to form carbonic acid, which is extremely corrosive to steel, and its corrosiveness is even more serious than hydrochloric acid; under suitable humidity (relative humidity greater than 30%) and pressure conditions, carbon dioxide will cause damage to oil casings, etc. General corrosion and localized corrosion may even lead to failure of production oil and casing due to corrosion fracture in severe cases, shorten the production life of oil and gas wells, and cause huge ec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04
Inventor 陈怀兵李养池张新发徐军郭亮李世勇吴保玉
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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