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Corrosion inhibitor for oilfield flooding and preparation method thereof

A technology of oilfield water injection and corrosion inhibitor, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc., can solve the problems of limited corrosion inhibition effect of corrosion inhibitor, difficult metal equipment and pipeline protection, etc., and achieve Good corrosion inhibition effect, choose low toxicity, and obvious corrosion inhibition effect

Inactive Publication Date: 2016-08-10
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high salinity and water temperature of oily sewage, it often carries H 2 S and dissolved oxygen are corrosive media, therefore, the corrosion of sewage treatment equipment and water injection pipelines is very serious. At present, the corrosion inhibition effect of corrosion inhibitors is limited, and it is difficult to achieve effective protection for metal equipment and pipelines under the condition of large dosage.

Method used

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  • Corrosion inhibitor for oilfield flooding and preparation method thereof
  • Corrosion inhibitor for oilfield flooding and preparation method thereof
  • Corrosion inhibitor for oilfield flooding and preparation method thereof

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preparation example Construction

[0017] The second aspect of the present invention provides the preparation method of above-mentioned oil field water injection corrosion inhibitor, and its step comprises:

[0018] A, prepare Mannich base quaternization derivative, its step comprises: get reaction raw material and join in the solvent, described reaction raw material is 2-mercaptobenzothiazole and benzaldehyde or 2-mercaptobenzothiazole and furfural, Or 2-mercaptobenzothiazole and cinnamaldehyde, stir, add aniline dropwise, adjust the system pH=2~3, react at 75~90°C for 4~10h, and obtain the Mannich base compound; cool to 50-70°C, drop Add benzyl chloride and continue the reaction for 2 to 3 hours to obtain the quaternized derivative of Mannich base;

[0019] B. Mix the quaternized derivative of Mannich base obtained in step A with acetylenic alcohol, alkali metal iodide, OP-10, urotropine and solvent in proportion.

[0020] Preferably, the molar ratio of the 2-mercaptobenzothiazole to furfural is 1.0:1.0-1.8;...

Embodiment 1

[0026] This embodiment provides a kind of corrosion inhibitor for oilfield water flooding, and its preparation step comprises the following steps:

[0027] A, preparation of Mannich base quaternized derivatives, the steps include: the mol ratio is 1.0:1.5 2-mercaptobenzothiazole, benzaldehyde and ethanol are mixed and packed into a three-necked flask, the quality of the ethanol is 1.0 times the total mass of 2-mercaptobenzothiazole and benzaldehyde, stir, then slowly add aniline dropwise, the amount of aniline added is 0.5 times the mass of 2-mercaptobenzothiazole, after stirring evenly, adjust the pH of the system with hydrochloric acid to 2~3, react at 80~85°C for 7h to obtain the Mannich base compound; cool to 60°C, add benzyl chloride dropwise, the amount of benzyl chloride added is 0.5 times the mass of 2-mercaptobenzothiazole , and continue to react for 2 to 3 hours to obtain the quaternized ammonium derivative of Mannich base, its molecular formula is:

[0028] B. Mi...

Embodiment 2

[0035] This embodiment provides a kind of corrosion inhibitor for oilfield water flooding, and its preparation step comprises the following steps:

[0036] A, preparation of Mannich base quaternized derivatives, the steps include: mixing 2-mercaptobenzothiazole, furfural and ethanol with a molar ratio of 1.0:1.0 into a three-necked flask, the quality of the ethanol is 2 - 1.5 times the total mass of mercaptobenzothiazole and furfural, stir, and then slowly add aniline dropwise. The amount of aniline added is 0.4 times the mass of 2-mercaptobenzothiazole. After stirring evenly, use hydrochloric acid to adjust the pH of the system to 2~ 3. React at 80-90°C for 9 hours to obtain the Mannich base compound; cool to 60°C, add benzyl chloride dropwise, the amount of benzyl chloride added is 0.4 times the mass of 2-mercaptobenzothiazole, continue After reacting for 2-3 hours, the quaternized ammonium derivative of Mannich base is obtained, and its molecular formula is:

[0037] B. ...

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Abstract

The invention provides an oilfield water injection corrosion inhibitor, the components comprising: 30-80% Mannich base quaternized ammonium derivatives, 10-60% solvent, 0-10% acetylenic alcohol, 0-10% by weight percentage 10% alkali metal iodide, 0-5% OP-10, 0-20% urotropine; and further provides a preparation method of the above oilfield water injection corrosion inhibitor. The invention has simple process, selects low-toxicity and easy-to-obtain synthetic raw materials, and is easy to realize industrialized production. The raw materials used in the invention have corrosion inhibition performance, and the corrosion inhibition effect is obvious after being further prepared as a corrosion inhibitor, without separation and purification, easy to use, and a small dosage has a good corrosion inhibition effect. Adding 100mg / L of the corrosion inhibitor of the present invention in the oil field water injection system can significantly reduce the corrosion rate of N80 steel, and adding 30mg / L of the corrosion inhibitor of the present invention can meet the oil and gas industry standard SY / T 5329-2012 " The recommended standard (<0.076mm / a) in "Recommended Indicators and Analysis Methods for Injection Water Quality in Clastic Reservoirs".

Description

technical field [0001] The invention relates to the technical field of metal corrosion and protection, in particular to an oilfield water injection corrosion inhibitor suitable for surface anticorrosion of oilfield sewage pipelines, water injection pipelines and oil pipes of water injection wells and a preparation method thereof. Background technique [0002] With the development of my country's oil and gas fields, the environment faced by oilfield exploitation is getting worse and worse. The output of many oil wells is declining, but the water content of the crude oil produced is gradually increasing, and the water content of most oil wells has reached more than 90%. The amount of oilfield sewage produced by dehydration of crude oil is increasing day by day, and the treatment and discharge of sewage has become a big problem. As far as oily sewage is concerned, using oilfield sewage as a water injection source can kill two birds with one stone, no matter from the economic po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 王任芳兰志威李克华杨冰冰
Owner YANGTZE UNIVERSITY
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