Corrosion inhibitor for resisting carbon dioxide corrosion, preparation method and application thereof

A carbon dioxide and corrosion inhibitor technology, applied in chemical instruments and methods, earthwork drilling, drilling composition and other directions, can solve the problems of unstable corrosion inhibition performance, affecting the normal exploitation of oil and gas, formation damage, etc., and achieve corrosion inhibition. Good effect, the effect of expanding oil and gas production and reducing corrosion

Active Publication Date: 2022-03-08
DESHI ENERGY TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the increasing maturity of oil and gas extraction technology, the depth of the well being exploited is increasing, and the temperature at the bottom of the well is gradually increasing. The existing corrosion inhibitors are prone to problems such as unstable corrosion inhibition performance in the high-temperature bottom-hole environment, which will not only cause Affect the normal exploitation of oil and gas, and may also cause formation damage

Method used

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  • Corrosion inhibitor for resisting carbon dioxide corrosion, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Weigh 400.0g N-vinylpyrrolidone, 2.5g allyl polyoxyethylene methyl ether, 10.0g allyl polyoxyethylene epoxy ether, 87.5g bisallyl polyether (molecular weight average molecular weight 6000) was dissolved in 495.0g of absolute ethanol, nitrogen gas was introduced, then the temperature was raised to 65°C, 5.0g of azobisisobutyronitrile was added, stirred evenly, and reacted for 3 hours to obtain the first intermediate;

[0063] (2) Dissolve 100.0g of the first intermediate, 250.0g of N,N-methylenebisacrylamide, 100.0g of acrylamide and 50.0g of formaldehyde into 495.0g of absolute ethanol, add 5.0g of zinc fluoroborate, Adjust the pH to 2-3, then raise the temperature to 85°C, stir evenly and react for 6 hours to obtain the second intermediate;

[0064] (3) Weigh 500.0g of the second intermediate, raise the temperature to 85°C, add 70.0g of acetylenic alcohol and stir to react for 3 hours; then cool down to 40°C, add 30.0g of antimony trichloride, and stir for 0.5h to ...

Embodiment 2

[0066] (1) Weigh 150.0g N-vinylpyrrolidone, 5.0g allyl polyoxyethylene methyl ether, 10.0g allyl polyoxyethylene epoxy ether, 135.0g bisallyl polyether (average molecular weight is 10000) was dissolved in 698.0g of absolute ethanol, nitrogen gas was introduced, and then the temperature was raised to 75°C, 2.0g of azobisisobutyronitrile was added, stirred evenly, and reacted for 1 hour to obtain the first intermediate;

[0067] Steps (2) (3) are the same as in Example 1 to prepare corrosion inhibitor 2#.

Embodiment 3

[0069] (1) Weigh 545.5g N-vinylpyrrolidone, 1.8g allyl polyoxyethylene methyl ether, 9.1g allyl polyoxyethylene epoxy ether, 43.6g bisallyl polyether (average molecular weight is 4000) was dissolved in 390.0g of ethanol, nitrogen gas was introduced, then the temperature was raised to 75°C, 10.0g of azobisisobutyronitrile was added, stirred evenly, and reacted for 1 hour to obtain the first intermediate;

[0070] (2) (3) Same as Example 1, to prepare corrosion inhibitor 3#.

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Abstract

The application discloses a corrosion inhibitor for resisting carbon dioxide corrosion and its preparation method and application, belonging to the technical field of carbon dioxide displacement. The corrosion inhibitor is prepolymerized by the first monomer and N-vinylpyrrolidone to obtain the first intermediate, and the first intermediate, the second monomer and the third monomer react to obtain the second intermediate, and the second The intermediate is compounded by adding antimony trichloride after reacting with acetylenic alcohol. The preparation method of the corrosion inhibitor of the present invention is simple, and the prepared corrosion inhibitor can react with carbon dioxide, reduce the generation of acid solution, can be adsorbed on the metal surface to form a protective film, and prevent the acid solution from contacting the metal, thereby reducing the corrosion of the metal; At the same time, the high temperature performance is stable, and it can also play a good role in corrosion inhibition in the bottom of the well with high temperature.

Description

technical field [0001] The application relates to a corrosion inhibitor for resisting carbon dioxide corrosion and its preparation method and application, belonging to the technical field of carbon dioxide displacement. Background technique [0002] Carbon dioxide flooding technology is a kind of supercritical carbon dioxide fluid (the critical point of carbon dioxide is 7.4 MPa, temperature 31.2 ℃) is injected into the oil layer as an oil displacement agent, and the injected carbon dioxide can reduce the viscosity of crude oil, improve the oil-water mobility ratio, The characteristics of expanding the volume of crude oil and enhancing the energy of oil reservoirs can realize miscible displacement under certain conditions, so as to achieve the purpose of expanding the degree of sweep and improving the recovery of oil reservoirs. [0003] However, carbon dioxide forms a miscible fluid with water in the downhole, that is, acid liquid, which will cause strong corrosion to pipel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F285/00C08F222/38C08F220/56C09K8/54C23F11/173
CPCC08F285/00C09K8/54C23F11/173C09K2208/32C08F222/385C08F220/56
Inventor 崔仕章王黎明宋新旺郭玉玺高瑞美张向红吴艳青
Owner DESHI ENERGY TECH GRP CO LTD
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