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Preparation method and application of low toxicity acidizing corrosion inhibitor

A technology of acidifying corrosion inhibitor and solvent, which is applied in the preparation of organic compounds, chemical instruments and methods, earth drilling and mining, etc. It can solve the problems of large environmental pollution, easy delamination, poor dissolution and dispersion performance, etc., and reduce the corrosion rate , Anti-corrosion, cost-saving effect

Inactive Publication Date: 2013-09-11
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, most of the raw materials used in the synthesis of Mannich bases contain formaldehyde and aniline, which are highly polluting to the environment, and there are disadvantages such as easy stratification and poor solubility and dispersion performance at high temperatures, so environmentally friendly new low-toxic raw materials are used. It is especially important to replace

Method used

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  • Preparation method and application of low toxicity acidizing corrosion inhibitor
  • Preparation method and application of low toxicity acidizing corrosion inhibitor
  • Preparation method and application of low toxicity acidizing corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 12.56g of N-methylcyclohexylamine, 26.44g of cinnamaldehyde and 5.46g of isopropanol into a three-necked flask, then slowly add 15.62g of acetophenone dropwise, stir evenly, and adjust the pH to 4 with hydrochloric acid. React at ~95°C for 7 hours, and the Mannich base can be obtained after the system is cooled. Take out 15g of the Mannich base and put it into a three-necked flask, slowly add 18g of benzyl bromide dropwise, react at 84-93°C for 3h, and cool down to room temperature to obtain the Mannich base quaternary ammonium salt. Take out 15g of Mannich base quaternary ammonium salt and 85g of methanol and stir evenly to obtain the corrosion inhibitor of the present invention, which is designated as corrosion inhibitor sample A. Wherein the Mannich base quaternary ammonium salt molecular formula is:

[0025]

Embodiment 2

[0027] Mix 11.42g of N-methylcyclohexylamine, 26.44g of cinnamaldehyde and 4.99g of isopropanol into a three-necked flask, then slowly add 12.02g of acetophenone dropwise, stir evenly, and adjust the pH to 4 with hydrochloric acid. React at ~98°C for 5 hours, and the Mannich base can be obtained after the system is cooled. Take out 15g of the Mannich base and put it into a three-necked flask, slowly add 15g of benzyl chloride dropwise, react at 86-95°C for 2h, and cool down to room temperature to obtain the Mannich base quaternary ammonium salt. Take out 17g of Mannich base quaternary ammonium salt and 83g of absolute ethanol and stir evenly to obtain the corrosion inhibitor of the present invention, which is designated as corrosion inhibitor sample B. Wherein the Mannich base quaternary ammonium salt molecular formula is:

[0028]

Embodiment 3

[0030] Mix 14.85g of N-methylcyclohexylamine, 26.44g of cinnamaldehyde and 5.45g of isopropanol into a three-necked flask, then slowly add 13.22g of acetophenone dropwise, stir evenly, and adjust the pH to 4 with hydrochloric acid. React at ~100°C for 6 hours, and the Mannich base can be obtained after the system is cooled. Take out 15g of the Mannich base and put it into a three-necked flask, slowly add 19.5g of benzyl chloride dropwise, react at 83~89°C for 4h, and cool down to room temperature to obtain the Mannich base quaternary ammonium salt. Take out 20g of Mannich base quaternary ammonium salt, 70g of methanol and 10g of dimethylformamide and stir evenly to obtain the corrosion inhibitor of the present invention, which is designated as corrosion inhibitor sample C.

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Abstract

The invention discloses a preparation method and application of a low toxicity acidizing corrosion inhibitor. The preparation method mainly includes two steps: 1. synthesizing a Mannich base quaternary ammonium salt; and 2. diluting the Mannich base quaternary ammonium salt to 15-20% (mass percentage) with a solvent. The corrosion inhibitor disclosed in the invention is a typical adsorption type corrosion inhibitor, can rapidly form a compact and firm hydrophobic protective membrane on the surface of a P110 steel test piece, thus effectively preventing an acid solution from corroding P110 steel. The corrosion inhibitor prepared in the invention belongs to a mixed corrosion inhibit inhibitor. The inhibitor employs cinnamic aldehyde with the advantages of the green, low toxicity, easy degradation and the like to replace the cancerogenic substance formaldehyde, is not added with iodide, alkynol or other synergists polluting the environment, has the advantages of simple synthesis process, small dosage, low toxicity, etc., and is suitable to oil and gas well acidizing, acid fracturing stimulation and other operations.

Description

technical field [0001] The invention relates to a preparation method and application of a low-toxic acidification corrosion inhibitor, belonging to the technical field of metal corrosion and protection. Background technique [0002] With the deepening of the development of oil and gas fields in my country, most oil and gas fields need to rely on acidizing process to treat formations in the process of exploitation, improve the recovery rate of oil and gas wells, and realize the increase and stability of oil and gas wells. The acidizing process of oil and gas wells refers to injecting acid liquid from the ground into the formation through mechanical equipment, and through the dissolution of the acid liquid on the rock, the substances that block the oil, gas and water channels are dissolved and removed, so that the pores and fractures of the formation are enlarged and unblocked, reducing the The flow resistance of oil and gas is reduced, so as to achieve the purpose of enhancin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C07C221/00C07C225/16
Inventor 卢永斌张世君杨志刚白方林李辉何飞朱世东
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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