Oil-soluble corrosion inhibitor, its preparation method

An oil-soluble corrosion inhibitor and corrosion inhibitor technology, which is applied in the directions of earthwork drilling, wellbore/well components, etc., can solve the problems of cumbersome preparation of imidazoline quaternary amine compounds, poor corrosion inhibition effect, etc., and achieves simple manufacturing, chemical Good stability and thermal stability, the effect of a wide range of applications

Active Publication Date: 2014-06-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1966774A discloses a kind of suppressing oil and gas field exploitation, gathering and transporting process associated H 2 S and CO 2 Corrosion inhibitor, but the preparation of imidazoline quaternary ammonium compound in the corrosion inhibitor is cumbersome, and the corrosion inhibition effect of the corrosion inhibitor is poor above 100°C and in a higher pressure environment

Method used

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  • Oil-soluble corrosion inhibitor, its preparation method
  • Oil-soluble corrosion inhibitor, its preparation method
  • Oil-soluble corrosion inhibitor, its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Mix and stir thiourea and β-hydroxyethylethylenediamine according to the molar ratio of 1:1.2, heat up to 160°C and react for 4 hours; after cooling below 80°C, add according to the molar ratio of 1:1 to thiourea After the addition of isooctanoic acid, react at a temperature of 150°C for 4 hours, and obtain the imidazolidinethione derivative I after cooling.

[0028] Mix and stir thiourea and 3-hydroxyethylethylenediamine according to the molar ratio of 1:1, raise the temperature to 150°C and react for 3 hours; after cooling below 80°C, add lauryl according to the molar ratio of 1:0.8 to thiourea Acid (dodecanoic acid), react at a temperature of 180° C. for 2 hours after the addition, and obtain imidazolidinethione derivative II after cooling.

[0029] Mix and stir thiourea and β-hydroxyethylethylenediamine at a molar ratio of 1:1.1, heat up to 150°C for 3 hours; cool to below 80°C and add positive Octanoic acid, react at a temperature of 180° C. for 2 hours after the ...

Embodiment 2

[0031] Mix and stir n-octanol and phosphorus pentoxide at a molar ratio of 1:1.5, raise the temperature to 50° C., react for 3 hours, and obtain mixed alkyl phosphate IV after cooling.

[0032] Mix and stir n-dodecyl alcohol and phosphorus pentoxide at a molar ratio of 1:1, raise the temperature to 80°C, react for 5 hours, and obtain mixed alkyl phosphate V after cooling.

Embodiment 3

[0034] Obtain imidazolidinethione derivatives I, II, III and mixed alkyl phosphate IV, V respectively with C according to Examples 1-2 6 ~C 10 Aromatics were stirred and mixed according to the weight ratio to prepare different corrosion inhibitors, as shown in Table 1.

[0035] The composition of table 1 corrosion inhibitor

[0036]

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Abstract

The invention discloses an oil-soluble corrosion inhibitor, and its preparation method. The oil-soluble corrosion inhibitor comprises 30-70wt% of imidazolidinethione derivative of formula (1), 10-40wt% of alkyl phosphate of formula (2), and 10-50wt% of organic solvent, in the formula (1), R1 represents C6-C15 alkyl, R2 represents C6-C12 alkyl, R3 is R2 or H, and R4 is R2 or H. The corrosion inhibitor of the invention can inhibit the corrosion of metal surface in an environment containing H2S and CO2, has good metal surface film-forming property, can be used in high-temperature high-pressure oil wells or gathering and distribution system, and has good effect of protecting the surfaces of metal pipelines and devices.

Description

technical field [0001] The invention belongs to the field of metal corrosion inhibition, and more specifically relates to a method for inhibiting H 2 S / CO 2 Corrosion oil-soluble corrosion inhibitors and methods for their preparation. Background technique [0002] During the development of oil and gas fields, the accompanying oil and gas contain a large amount of CO 2 、H 2 S and Cl - Corrosive media such as corrosive media, together with formation water and condensate water, is one of the main reasons for the damage of metal materials in the process of oil and gas well exploitation and transportation, shortening the service life of oil and gas field equipment and gathering and transportation pipelines. In recent years, with the rapid development of the oil and gas industry, CO 2 、H 2 Oil and gas fields where S and other corrosive media coexist have appeared one after another, and the accidents caused by this have become more and more serious, causing huge economic loss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
Inventor 于凤昌段永锋李春贤崔中强唐应彪苗普
Owner CHINA PETROLEUM & CHEM CORP
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