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High-temperature acidification corrosion inhibitor and preparation method thereof

A technology of acidification corrosion inhibitor and high temperature, which is applied in the field of high temperature acidification corrosion inhibitor and its preparation, can solve the problems of insignificant corrosion inhibition effect, single application range, poor temperature resistance, etc., and achieve good corrosion inhibition effect and compatibility, Good water solubility and strong temperature resistance

Active Publication Date: 2013-03-27
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of traditional acidification corrosion inhibitors such as single application range, poor temperature resistance, insignificant corrosion inhibition effect, high toxicity, and high cost.

Method used

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  • High-temperature acidification corrosion inhibitor and preparation method thereof
  • High-temperature acidification corrosion inhibitor and preparation method thereof
  • High-temperature acidification corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0020] Prepare the high-temperature acidification corrosion inhibitor according to the weight of each component in Table 1, add the raw materials in Table 1 to the reaction kettle in turn, and stir at 60°C for 20-30 minutes to prepare two acidification corrosion inhibitors HKS01 and HKS02, as shown in Table 1. Show.

[0021] Table 1 Composition of different high temperature acidizing corrosion inhibitors

[0022]

[0023] The N-ethylamino-2-perfluorononylimidazoline quaternary ammonium salt adopted in the present embodiment adopts structural formula (1), shown in (2), wherein R 1 for CF 3 -(CF 2 ) 8 , R 2 For ethyl. The hydrocarbon imidazoline quaternary ammonium salt used in this embodiment is 1-benzyl 1-aminoethyl-2-heptylalkylimidazoline quaternary ammonium salt.

Embodiment 2

[0024] Example 2: Toxicity test of N-ethylamino-2-perfluorononylimidazoline quaternary ammonium salt, the main agent of high-temperature acidification corrosion inhibitor

[0025] Take a sample of N-ethylamino-2-perfluorononyl imidazoline quaternary ammonium salt and send it to Shaanxi Food and Drug Inspection Institute LD 50 In the test, the result showed 1046.41mg / kg, indicating that the product is of low toxicity level.

Embodiment 3

[0026] Embodiment 3: corrosion inhibitor evaluation example:

[0027] Evaluation of fluorine-containing imidazoline quaternary ammonium hydrochloride corrosion inhibitor: chemically pure acid solution is used, prepared with deionized water, the concentration measurement is carried out according to GB622-89, and the dosage of corrosion inhibitor is uniformly calculated and added according to weight percentage. Add a corrosion inhibitor (according to the amount of hydrochloric acid) into the uniformly configured 15% hydrochloric acid solution, mix well, heat to 90°C, and then add it to the high-pressure reactor. Tie the treated N80 steel test piece to the hanging hole of the PTFE disc of the kettle cover with a PTFE tape, and cover the kettle cover. When the temperature rises to 138°C, adjust the rotating speed to 100r / min, start recording the time and pressure, keep it at 140°C for 4 hours, and then cool it quickly with cooling water. When the temperature was lowered to 90°C, ...

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Abstract

The invention relates to a high-temperature acidification corrosion inhibitor and a preparation method thereof. The high-temperature acidification corrosion inhibitor is prepared from the following components in parts by weight: 1-5 parts of N-alkylamino-2-perfluoroalkyl imidazoline quaternary ammonium salt, 30-50 parts of hydrocarbon imidazoline quaternary ammonium salt, 0-5 parts of sodium molybdate, 5-15 parts of thiocarbamide, 20-30 parts of ethanol and 10-20 parts of water. The preparation method comprises the following steps: adding the raw materials into a reaction kettle in turn, and stirring at 20-80 DEG C for 10-30 minutes to obtain the high-temperature acidification corrosion inhibitor. As the high-temperature acidification corrosion inhibitor contains the N-alkylamino-2-perfluoroalkyl imidazoline quaternary ammonium salt with special properties, compared with the conventional acidification corrosion inhibitor, the high-temperature acidification corrosion inhibitor provided by the invention has the advantages of low addition amount, good water solubility, strong temperature resistance, high corrosion inhibition rate and the like. When being used under acidification conditions at 150-200 DEG C, the high-temperature acidification corrosion inhibitor still has good corrosion inhibition effect and compatibility. The invention has the advantages of high corrosion-inhibition efficiency, low toxicity, environmental protection, high temperature resistance, wide application systems and the like, and can be used as the component of a high-temperature acidification liquid corrosion inhibitor.

Description

technical field [0001] The invention relates to a corrosion inhibitor, in particular to a high-temperature acidification corrosion inhibitor and a preparation method thereof. It belongs to the technical field of metal anticorrosion. Background technique [0002] With the deepening of the development of oil and gas fields in my country, a large number of oil and gas fields need to rely on acidizing to treat formations in the process of exploitation, so as to realize the stable and increased production of oil and gas wells. The commonly used hydrochloric acid, hydrofluoric acid, etc. are highly corrosive to metal products such as metal pipelines and equipment, causing equipment damage, pipeline corrosion and other accidents, seriously affecting the normal production of oil and gas. At the same time, due to the continuous increase in the depth of formation drilling and the emergence of high-temperature and ultra-high-temperature oil and gas fields, conventional corrosion inhib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 陈晓东张向东刘世川程雯刘彦峰王喜叶
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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