Preparation method of novel acidified corrosion inhibitor and use thereof

A corrosion inhibitor and oil well acidizing technology, which is applied in the fields of earthwork drilling, organic chemistry, wellbore/well components, etc., can solve the problems of high cost, limited source of raw materials, and restrictions on the wide application of imidazoline corrosion inhibitors, etc.

Inactive Publication Date: 2009-10-28
XINJIANG UNIVERSITY
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the imidazole used in the synthesis of imidazoline quaternary ammonium salts has disadvantages such ...

Method used

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  • Preparation method of novel acidified corrosion inhibitor and use thereof
  • Preparation method of novel acidified corrosion inhibitor and use thereof
  • Preparation method of novel acidified corrosion inhibitor and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 is used to illustrate the experimental synthesis scheme and preparation method of imidazoline quaternary ammonium salt.

[0020] The experimental synthesis scheme of imidazoline quaternary ammonium salt is shown in Scheme 1:

[0021] Scheme 1:

[0022]

[0023] The specific synthesis method is as follows:

[0024] Take cottonseed oil and triethylenetetramine in a mass ratio of 1.84:1 and place them in a dry reactor, add a certain amount of xylene and 0.25% boric acid as a catalyst, N 2 Under protection, react at 140-160°C for 2 hours, connect to a water separator, program temperature rise to 210°C, react for 7 hours, and separate the water generated by the reaction. Replace the rotary evaporation, evaporate a small amount of xylene and water, pour the viscous substance in the flask into a large beaker equipped with a mixed solvent of ethanol, ethyl acetate and petroleum ether (3:3:1) while hot, Cool and remove the supernatant to obtain the cottonseed ...

Embodiment 2

[0025] Embodiment 2 is used to illustrate the compounding of imidazoline quaternary ammonium salt product and propynyl alcohol.

[0026] The synthetic imidazoline quaternary ammonium salt is mixed with 25% of the total mass of propynyl alcohol to obtain the oil field acidizing corrosion inhibitor of the present invention.

Embodiment 3

[0027] Example 3 is used to illustrate the research on the corrosion inhibition performance of the oilfield acidizing corrosion inhibitor. According to the test method and evaluation index described in the petroleum and natural gas industry standard SY / T5405-1996 of the People's Republic of China, the performance evaluation of the prepared oilfield acidizing corrosion inhibitor was carried out.

[0028] In 15% HCl environment, the influence of temperature on 0.4% mass concentration oil well acidizing corrosion inhibitor is listed in Table 1.

[0029] Table 1

[0030] Corrosion temperature (℃)

60

70

80

90

Corrosion rate (g / m 2 h)

0.70

0.78

1.03

1.44

[0031] In 60°C, 15% HCl environment, the effect of time on 0.4% mass concentration oil well acidizing corrosion inhibitor is listed in Table 2.

[0032] Table 2

[0033] Corrosion time (h)

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Abstract

The invention relates to a acidified corrosion inhibitor for oil well and preparation method thereof. The preparation has the steps of: firstly synthesizing imidazoline intermediate body, carrying out quaternization reaction with benzyl chloride, and then compounding generated quaternary ammonium salt and propiolic alcohol according to mass ratio 3:1 for obtaining the product. 0.4% (mass percentage content) of present corrosion inhibitor in 15% HCl medium has obvious inhibition for corrosion of N80 carbon steel. The corrosion rate is 0.70 g/mh after 4h of corrosion at 60 DEG C, the corrosion inhibition efficiency thereof can reach to 99.39%; the corrosion rate is 1.44 g/mh after 4h of corrosion at 90 DEG C, which is superior to oil and gas industry standard of the People's Republic of China SY/T5405-1996 corrosion evaluating indicator first grade product standard (at 60 DEG C, first grade product standard is 2-3g/mh; at 90 DEG C, first grade product standard is 3-4g/mh).

Description

technical field [0001] The invention relates to an oil well acidification corrosion inhibitor, which is mainly used for preventing acid liquid from corroding pipelines, storage tanks and metal equipment during the oil well acidification process. technical background [0002] Acidizing refers to a technology that injects a large amount of high-concentration acid liquid into the formation to compress and acidify limestone oil and gas wells to restore or increase the permeability of the formation, and realize the increase of production of oil and gas wells and the increase of injection of water wells. However, during the acidizing process, the injection of high-concentration and large amounts of acid will cause the pipelines, storage tanks and process equipment in the oil-water well to be corroded to varying degrees. In order to prevent or reduce the corrosion of equipment and downhole pipelines by acid liquid, corrosion inhibitors are usually added to acid liquid. At present,...

Claims

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Application Information

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Owner XINJIANG UNIVERSITY
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