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Imidazoline mannich base corrosion inhibitor and preparation method thereof

A Mannich base-like and imidazoline-like technology is applied in the field of imidazoline-like Mannich base corrosion inhibitor and its preparation, and can solve problems such as wellbore pipe wall corrosion, safety accident, oil pipe fracture and the like

Active Publication Date: 2019-08-09
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of injecting acid liquid into the formation, it will cause serious corrosion to the wall of the wellbore pipe, and even cause the oil pipe to break and cause a safety accident

Method used

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  • Imidazoline mannich base corrosion inhibitor and preparation method thereof
  • Imidazoline mannich base corrosion inhibitor and preparation method thereof
  • Imidazoline mannich base corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The imidazoline Mannich base corrosion inhibitor of this embodiment has the structure shown in formula I:

[0029]

[0030] R is CH 3 (CH 2 ) 7 CH=CH(CH 2 ) 7 —.

[0031] The imidazoline Mannich base corrosion inhibitor of the present embodiment is made from the raw materials in the following mass percentages: 18.1% benzaldehyde, 12.4% methyl ethyl ketone, 47.9% imidazoline oleate, 17.2% ethanol, 4.3% concentrated hydrochloric acid, Catalyst AlCl 3 0.1%.

[0032] Described imidazoline oleate is made by the preparation method comprising the following steps:

[0033] 1) Mix oleic acid and diethylenetriamine at a molar ratio of 1:1.2, heat to 160°C, keep at a constant temperature for 2 hours, and continue to heat up to 180°C for 2 hours to obtain an amide;

[0034] 2) Continue to heat up the amide obtained in step 1) to 210°C, keep the temperature constant for 2 hours, then continue to heat up to 230°C, keep the temperature for 2 hours, stop heating after the p...

Embodiment 2

[0042] The structure of the imidazoline Mannich base corrosion inhibitor in this embodiment is the same as that in Embodiment 1.

[0043] The imidazoline Mannich base corrosion inhibitor of the present embodiment is made from the raw materials in the following mass percentages: 15% benzaldehyde, 10.2% butanone, 49.2% imidazoline oleate, 21.2% ethanol, 4.2% concentrated hydrochloric acid, Catalyst InCl 3 0.2%.

[0044] Described imidazoline oleate is made by the preparation method comprising the following steps:

[0045] 1) Mix oleic acid and diethylenetriamine at a molar ratio of 1:1.2, heat to 150°C, keep at a constant temperature for 2 hours, and continue to heat up to 170°C for 2 hours to obtain an amide;

[0046] 2) Continue to heat up the amide obtained in step 1) to 200°C, keep the temperature for 2 hours, then continue to heat up to 220°C, keep the temperature for 2 hours, stop heating after the produced water meets the requirements, and obtain oleic acid imidazoline...

Embodiment 3

[0051] The structure of the imidazoline Mannich base corrosion inhibitor in this embodiment is the same as that in Embodiment 1.

[0052]The imidazoline Mannich base corrosion inhibitor of the present embodiment is made from the raw materials in the following mass percentages: 12.7% benzaldehyde, 8.6% methyl ethyl ketone, 50.2% imidazoline oleate, 24% ethanol, 4.2% concentrated hydrochloric acid, Catalyst NbCl 5 0.3%.

[0053] Described imidazoline oleate is made by the preparation method comprising the following steps:

[0054] 1) Mix oleic acid and diethylenetriamine at a molar ratio of 1:1.2, heat to 155°C, keep at a constant temperature for 1 hour, and continue to heat up to 175°C for 1 hour to obtain an amide;

[0055] 2) Continue to heat up the amide obtained in step 1) to 205°C, keep the temperature for 2 hours, then continue to heat up to 225°C, keep the temperature for 2 hours, stop heating after the produced water meets the requirements, and obtain oleic acid imid...

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Abstract

The invention relates to the technical field of corrosion inhibitors, and in particular relates to an imidazoline mannich base corrosion inhibitor and a preparation method thereof. The imidazoline mannich base corrosion inhibitor is of the structure shown in the formula I. The imidazoline mannich base corrosion inhibitor is prepared from, by mass, 10-20% of benzaldehyde, 5-15% of butanone, 40-60%of oleic acid imidazoline, 10-30% of ethanol, 1-5% of concentrated hydrochloric acid and 0.1-0.5% of a catalyst. According to the imidazoline mannich base corrosion inhibitor, a benzene ring, an imidazole ring and an ultra-long hydrophobic alkyl chain on imidazoline are introduced, the benzene ring in benzaldehyde and N atoms in the imidazoline ring have relatively high electron cloud density andcan form a firm coordination bond with an empty d track of metal, and the super-long hydrophobic alkyl chain forms a hydrophobic membrane layer away from the surface of the metal and has a peripheralshielding effect on the surface of the metal, so that the corrosion inhibitor has excellent corrosion inhibition performance in a high-temperature acidification environment.

Description

technical field [0001] The invention relates to the technical field of corrosion inhibitors, in particular to an imidazoline Mannich base corrosion inhibitor and a preparation method thereof. Background technique [0002] Acidizing is an effective measure for increasing production of oil and gas wells and increasing injection of water injection wells during the development of oil and gas reservoirs. Acidizing operations have been widely used in major oil and gas fields. However, during the process of injecting the acid liquid into the formation, it will cause serious corrosion to the wellbore pipe wall, and even cause the oil pipe to break and cause a safety accident. In order to reduce corrosion, corrosion inhibitors must be added during acidification construction. [0003] Mannich base corrosion inhibitors are a class of acidification corrosion inhibitors developed in recent years with excellent performance. They are widely used in oil and natural gas production, and are ...

Claims

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Application Information

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IPC IPC(8): C07D233/16C09K8/54C09K8/74
CPCC07D233/16C09K8/54C09K8/74C09K2208/32
Inventor 赵起锋徐慧秦俊岭狄志刚尚跃再马胜军廖伍彬刘博王伟杰
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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