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Polymeric asphaltene precipitation inhibitor and preparation method thereof

A precipitation inhibitor and asphaltene technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor high temperature stability, single action mechanism, high cost of raw materials, and achieve excellent high temperature resistance performance and excellent effect. , the effect of low product toxicity

Pending Publication Date: 2022-06-21
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] (1) The mechanism of action is single, and the effect of inhibiting asphaltene aggregation and precipitation is limited;
[0017] (2) Aromatic hydrocarbons need to be used as solvents during implementation, the cost of raw materials is high, and it will cause harm to the environment;
[0018] (3) Poor high temperature stability, unable to play a good role in high temperature and high pressure environment

Method used

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  • Polymeric asphaltene precipitation inhibitor and preparation method thereof
  • Polymeric asphaltene precipitation inhibitor and preparation method thereof
  • Polymeric asphaltene precipitation inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) 9.81g (0.1mol) maleic anhydride and 42.66ml (0.12mol) 1-octadecene were firstly added to 50ml o-xylene, and stirred to dissolve; 1% of the mass) AIBN to make it fully dissolved, replace the air in the reaction vessel with nitrogen, react at 80°C for 4h, and raise the temperature to 120°C for another 1h. The polymer solution after the reaction was slowly dropped into methanol, and the product was washed with methanol, filtered and dried to obtain a polymaleic anhydride-1-octadecene polymer.

[0045] (2) Dissolve 3.5 g (0.01 mol) of the above product and 1.2 ml (0.01 mol) of 1-(3-aminopropyl) imidazole in 50 ml of dimethylformamide, and react at 70°C for 12 h. The polymer solution was slowly dropped into ether, and the final product was obtained after washing, suction, filtration and drying. figure 1 .

[0046] The precipitation inhibitor prepared by this method was added to the prepared model oil, the initial precipitation point of asphaltene was delayed from 47% t...

Embodiment 2

[0048] (1) 9.81g (0.1mol) maleic anhydride and 46.77ml (0.12mol) 1-docosene were added to 50ml o-xylene, and stirred to dissolve; 0.2g (the dosage was the reactant) 0.5% of the total mass) AIBN to make it fully dissolved, replace the air in the reaction vessel with nitrogen, react at 70° C. for 6 hours, and then raise the temperature to 120° C. for another 1.5 hours. The polymer solution after the reaction was slowly dropped into methanol, and the product was washed with methanol, filtered and dried to obtain a polymaleic anhydride-1-docosene polymer.

[0049] (2) Dissolve 3.8 g (0.01 mol) of the above product and 1.26 ml (0.01 mol) of 1-(3-aminopropyl)-2-pyrrolidone in 50 ml of dimethylformamide, and react at 90°C for 14 hours. The finished polymer solution was slowly dropped into ether, and the final product was obtained after washing, suction, filtration and drying. figure 2 .

[0050] The precipitation inhibitor prepared by this method was added to the prepared model oi...

Embodiment 3

[0052] (1) 9.81g (0.1mol) maleic anhydride and 38.2ml (0.12mol) 1-hexadecene were first added to 50ml o-xylene, and stirred to dissolve; 1% of the mass) AIBN to make it fully dissolved, replace the air in the reaction vessel with nitrogen, react at 80° C. for 5 hours, and then raise the temperature to 120° C. for another 2 hours. The polymer solution after the reaction was slowly dropped into methanol, and the product was washed with methanol, filtered and dried to obtain polymaleic anhydride-1-hexadecene.

[0053] (2) Dissolve 3.2 g (0.01 mol) of the above product and 1.8 ml (0.02 mol) of 2-amino-3-hydroxypyridine in 50 ml of dimethylformamide, and react at 80°C for 15 h, and the polymer after the reaction is completed. The solution was slowly dropped into ether, and the final product was obtained after washing, suction, filtration and drying. image 3 .

[0054] The precipitation inhibitor prepared by this method was added to the prepared model oil, the initial precipitati...

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Abstract

The invention provides a polymeric asphaltene precipitation inhibitor and a preparation method thereof, and relates to the field of oilfield chemical assistants. The precipitation inhibitor is a polymeric inhibitor with a maleic anhydride-alpha-olefin copolymer as a main chain and an amino-containing heteroaromatic ring as a branched chain. The preparation method comprises the following steps: firstly, reacting maleic anhydride with alpha-olefin to generate a maleic anhydride-alpha-olefin copolymer, and then connecting an aromatic heterocyclic ring with alpha-amino to the copolymer, thereby obtaining the maleic anhydride-alpha-olefin copolymer. The precipitation inhibitor can enhance adsorption of asphaltene molecules through electron acceptor-electron donor, pi-pi conjugation, acid-base interaction, hydrogen bonds and other acting forces, meanwhile, the introduced long-chain alkyl group has a steric hindrance effect, and an aromatic heterocyclic structure is introduced into the side chain of the copolymer, so that the heat resistance of the copolymer is improved; therefore, asphaltene precipitation can be effectively inhibited, and the device can adapt to the working environment of a high-temperature and high-pressure oil field.

Description

technical field [0001] The invention belongs to the field of oilfield chemical additives, and relates to a polymeric asphaltene precipitation inhibitor and a preparation method thereof. Background technique [0002] In the process of oil and gas field development, formation blockage and wellbore blockage caused by the precipitation and deposition of asphaltenes is an important reason for the decline of productivity, and it is also a serious problem faced by the petroleum industry. Sinopec Xinjiang Shunbei Oilfield currently has serious asphaltene wellbore deposition, which seriously affects the normal production at the site. However, the Shunbei block is a karst fracture-cave type volatile light oil and gas reservoir, which is characterized by ultra-deep (7200-9000m), high temperature (>150℃), and high pressure (>85MPa). Precipitation measures are difficult to implement. Asphaltenes are the components with the highest molecular weight, highest aromaticity and polarit...

Claims

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Application Information

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IPC IPC(8): C08F210/14C08F222/06C08F8/32C09K8/524
CPCC08F210/14C08F8/32C09K8/524C08F222/06
Inventor 赵海洋曹畅刘磊杨祖国任波闫科举程仲富范伟东邢钰焦保雷李亮孙桓郭强王磊磊王莎
Owner CHINA PETROLEUM & CHEM CORP
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