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Novel preparation method of schiff base oil well acidification corrosion inhibitor and application of preparation method

A technology of Schiff base oil well and acidizing corrosion inhibitor, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of increasing the cost of acidizing fracturing mining technology, loss of tubing steel, and unsatisfactory strong acid anticorrosion effect, etc. Achieve the effects of wide application temperature range, good dispersion and easy production

Inactive Publication Date: 2012-07-11
XIAN SANHUAN TECH DEV GENERAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At the same time, with the continuous change of mining temperature, tubing steels of different materials have been used in oil and gas mining, but the anticorrosion effect against strong acid in the acidizing process is not satisfactory, resulting in the loss of tubing steels and increasing the acidification fracturing mining technology. the cost of

Method used

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  • Novel preparation method of schiff base oil well acidification corrosion inhibitor and application of preparation method
  • Novel preparation method of schiff base oil well acidification corrosion inhibitor and application of preparation method
  • Novel preparation method of schiff base oil well acidification corrosion inhibitor and application of preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 36.96g of cinnamon oil and 19.84g of cyclohexylamine into a three-necked flask, then add 100g of the azeotrope of benzene and ethanol (67.6g of ethanol, 32.4g of benzene) and mix evenly, and heat up to the reflux temperature of the azeotrope of benzene and ethanol 65 ~ 70 ° C, after 5 hours of heat preservation reaction, the azeotrope of water, benzene and ethanol was distilled off under reduced pressure at 58 ~ 65 ° C, and then recrystallized twice with ethanol to obtain the compound 1-phenyl-3-(1 -cyclohexylamine)-1-propene, the product is obtained by liquid chromatography-mass spectrometry; then take 10g 1-phenyl-3-(1-cyclohexylamine)-1-propene, 0.5g cyclohexane Amine, 2g of methoxypropylamine, 3g of cetyltrimethylammonium chloride, 15g of N'N-dimethylformamide, and 69.5g of methanol can be mixed and stirred evenly.

[0024] Table 1 shows the evaluation results for N80 steel in 90°C, 15% HCl (weight) solution with different concentrations of corrosion inhibitors,...

Embodiment 2

[0028] Add 36.96g of cinnamon oil and 19.84g of cyclohexylamine into a three-necked flask, then add 100g of the azeotrope of benzene and ethanol (67.6g of ethanol, 32.4g of benzene) and mix evenly, and heat up to the reflux temperature of the azeotrope of benzene and ethanol 65 ~ 70 ° C, after 5 hours of heat preservation reaction, the azeotrope of water, benzene and ethanol was distilled off under reduced pressure at 58 ~ 65 ° C, and then recrystallized twice with ethanol to obtain the compound 1-phenyl-3-(1 -cyclohexylamine)-1-propene, the product is obtained by liquid chromatography-mass spectrometry; then take 15g 1-phenyl-3-(1-cyclohexylamine)-1-propene, 0.5g cyclohexane Amine, 1g of methoxypropylamine, 3g of cetyltrimethylammonium chloride, 20g of N'N-dimethylformamide, and 60.5g of methanol can be mixed and stirred evenly.

[0029] Table 2 shows the evaluation results of the corrosion inhibitor in 15% HCl (weight) solution for N80 steel at different temperatures, and th...

Embodiment 3

[0033] Add 36.96g of cinnamon oil and 19.84g of cyclohexylamine into a three-necked flask, then add 100g of the azeotrope of benzene and ethanol (67.6g of ethanol, 32.4g of benzene) and mix evenly, and heat up to the reflux temperature of the azeotrope of benzene and ethanol 65 ~ 70 ° C, after 5 hours of heat preservation reaction, the azeotrope of water, benzene and ethanol was distilled off under reduced pressure at 58 ~ 65 ° C, and then recrystallized twice with ethanol to obtain the compound 1-phenyl-3-(1 -cyclohexylamine)-1-propene, the product is obtained by liquid chromatography-mass spectrometry; then take 15g 1-phenyl-3-(1-cyclohexylamine)-1-propene, 2g cyclohexylamine , 1g of methoxypropylamine, 3g of cetyltrimethylammonium chloride, 15g of N'N-dimethylformamide, and 64g of ethanol can be mixed and stirred evenly.

[0034] Table 3 shows the evaluation results for different materials in 15% HCl (weight) solution at 90° C. under the concentration of 1% (weight) corrosi...

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Abstract

The invention relates to a novel preparation method of a schiff base oil well acidification corrosion inhibitor and application of the preparation method. The corrosion inhibitor comprises the following components in percentage by weight: 5-20 percent of schiff base compound, 0.5-2 percent of cyclohexylamine, 1-3 percent of methoxy amine, 3-5 percent of hexadecyl trimethyl ammonium chloride, 15-20 percent of N'N-dimethyl formamide and 50-75.5 percent of solvent. The corrosion inhibitor has extremely strong adsorption, can form a compact protective film on a metal surface and is extremely suitable for corrosion resistance of different oil pipe steel in acid fracturing construction of petroleum exploitation industry. The acidification corrosion inhibitor used for the oil pipe steel can also be promoted and used in pipeline acid washing of industries of chemical industry, water supply and drainage, boilers, steel mill and the like. The application temperature of the corrosion inhibitor in an acidification process can reach 140 DEG C; and the corrosion inhibitor is suitable for hydrochloric acid with concentration of reaching up to 25 percent, and has the characteristics of less using amount, high efficiency, wide application temperature range, suitability for oil pipes of different materials, good dispersion in acid solution, easiness and convenience for production and the like.

Description

technical field [0001] The invention belongs to the protection of metal materials in the field of petrochemical industry, and in particular relates to a preparation method and application of a novel Schiff base oil well acidification corrosion inhibitor, which is especially suitable for the corrosion protection of oil pipe steel in the oil well acidification process. Background technique [0002] Acid fracturing technology usually uses acid fluid to permeate into the oil and gas layer through the wellbore to achieve a series of application purposes, one of which is to increase the permeability of the formation. The increase of formation permeability can improve formation oil and gas recovery. [0003] In the acidizing technology, the acid liquid is injected into the formation under a certain pressure and flows into the pores of the formation. The acid solution reacts with the acid-soluble substances in the formation, resulting in an increase in the porosity and permeability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC23F11/146
Inventor 方晓君王远张娟涛上官丰收尹成先严密林
Owner XIAN SANHUAN TECH DEV GENERAL
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