Corrosion inhibitor suitable for complex wastewater of oilfield and preparation method thereof

A corrosion inhibitor and complex technology, applied in the field of corrosion inhibitor and its manufacturing, can solve the problems of lack of corrosion inhibitor and poor corrosion inhibition effect of sewage, etc., and achieve the effect of high salinity

Inactive Publication Date: 2010-02-24
天津中油科远石油工程有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the corrosion inhibitors used in oil field sewage pipelines are generally imidazolines, organic amines, and organic phosphorus corrosion inhibitors. Carbon dioxide and sewage with a temperature not higher than 70°C have a certain corrosion inhibition effect, but the corrosion inhibition effect is poor for sewage with high hydrogen sulfide, high carbon dioxide, high salinity and high temperature characteristics, and there is a lack of corrosion inhibitors that can prevent the above problems at the same time. corrosion inhibitor

Method used

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  • Corrosion inhibitor suitable for complex wastewater of oilfield and preparation method thereof
  • Corrosion inhibitor suitable for complex wastewater of oilfield and preparation method thereof
  • Corrosion inhibitor suitable for complex wastewater of oilfield and preparation method thereof

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Effect test

Embodiment 1

[0050] Embodiment 1, according to the first step and the second step of the manufacturing method of corrosion inhibitor of the present invention mentioned above, imidazoline chloroacetate corrosion inhibitor and alkynyloxymethylamine quaternary ammonium salt corrosion inhibitor were prepared respectively;

[0051] Synthesis of the first step imidazoline chloroacetate corrosion inhibitor

[0052] A. Synthesis of oxazoline matrix

[0053] raw material:

[0054] Polyethylene polyamine, molecular formula [CH 2 =CH 2 NH 2 ]n (property: yellow or orange-red transparent viscous liquid, co-product of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine)

[0055] Oleic acid (cis-9-+ octa(carbon)enoic acid), molecular formula CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 COOH;

[0056] By mass ratio of polyethylene polyamine and oleic acid:

[0057] [CH 2 =CH 2 NH2 ]n:CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 COOH=1.1,

[0058] Add it into the reaction kettle, rai...

Embodiment 2

[0072] Embodiment two, also according to the first step and the second step of the manufacture method of the above-mentioned corrosion inhibitor of the present invention, but during the synthesis of the oxazoline substrate in the synthetic A process of the imidazoline chloroacetate corrosion inhibitor in the first step By mass ratio of polyethylene polyamine and oleic acid:

[0073] [CH 2 =CH 2 NH 2 ]n:CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 COOH=1.2, other conditions are unchanged, respectively make imidazoline chloroacetate corrosion inhibitor and alkynoxymethylamine quaternary ammonium salt corrosion inhibitor;

[0074] The third step is to compound the corrosion inhibitor-II according to the mass ratio of imidazoline chloroacetate corrosion inhibitor: alkynyloxymethylamine quaternary ammonium salt corrosion inhibitor = 1:2.

Embodiment 3

[0075] Embodiment three, also according to the first step and the second step of the manufacturing method of corrosion inhibitor of the present invention mentioned above, respectively make imidazoline chloroacetate corrosion inhibitor and alkynoxymethylamine quaternary ammonium salt corrosion inhibitor;

[0076] The third step is to compound the corrosion inhibitor-III according to the mass ratio of imidazoline chloroacetate corrosion inhibitor: alkynyloxymethylamine quaternary ammonium salt corrosion inhibitor = 2:1.

[0077] Application of corrosion inhibitor of the present invention in Dagang area. For example, Zaoda Station in Dagang Oilfield: the temperature at this station is 65°C, the salinity is 50,000mg / L, the hydrogen sulfide content is 30mg / L, the blank corrosion rate of the on-site coupon is 1.5mm / a, and the test piece is partially corroded and pitted After adding 30mg / L of corrosion inhibitor-I of the present invention, the corrosion rate is 0.015mm / a, the corrosi...

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Abstract

The invention relates to a corrosion inhibitor suitable for complex wastewater of oilfield and a preparation method thereof. The corrosion inhibitor is prepared by compounding imidazoline chloracetatecorrosion inhibitor and oxygen acetylene methyl amine quaternary ammonium salt corrosion inhibitor. The preparation method comprises the following steps: 1, synthesis of imidazoline chloracetate corrosion inhibitor, wherein a finished product of the imidazoline chloracetate corrosion inhibitor is generated after the synthesis of imidazoline matrix and quaternary amination of imidazoline; 2, synthesis of oxygen acetylene methyl amine quaternary ammonium salt corrosion inhibitor, wherein a finished product of the oxygen acetylene methyl amine quaternary ammonium salt corrosion inhibitor is generated after the synthesis of oxygen acetylene methyl alkyl amine salt and quaternary amination of dodecyl dimethyl amine; and 3, compounding of imidazoline chloracetate corrosion inhibitor and oxygenacetylene methyl amine quaternary ammonium salt corrosion inhibitor in a mass ratio of 0.5 to 2 so as to form the corrosion inhibitor.

Description

technical field [0001] The invention relates to a corrosion inhibitor suitable for complex sewage in oilfields and a manufacturing method thereof, which belongs to the anticorrosion technology in petroleum ground engineering pipeline networks, and especially refers to a corrosion inhibitor used in petroleum pipelines to prevent sewage from corroding metal pipelines and its production method. Background technique [0002] At present, the corrosion inhibitors used in oil field sewage pipelines are generally imidazolines, organic amines, and organic phosphorus corrosion inhibitors. Carbon dioxide and sewage with a temperature not higher than 70°C have a certain corrosion inhibition effect, but the corrosion inhibition effect is poor for sewage with high hydrogen sulfide, high carbon dioxide, high salinity and high temperature characteristics, and there is a lack of corrosion inhibitors that can prevent the above problems at the same time. Corrosion inhibitor. Contents of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
Inventor 赵常龙孟广伟张巧灵张玉娟陈志军朱烨陈杰赵华
Owner 天津中油科远石油工程有限责任公司
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