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High-temperature compound acidizing corrosion inhibitor and preparation method thereof

A technology of acidizing corrosion inhibitor and high temperature is applied in the field of high temperature composite acidifying corrosion inhibitor and its preparation, which can solve the problems of waste of resources, endangering the health of construction workers, reducing effective components, etc., and achieves less environmental harm, good acid solubility, The effect of high corrosion inhibition rate

Active Publication Date: 2016-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the continuous improvement of the drilling depth of formations and the emergence of high-temperature oil and gas fields, conventional acidification corrosion inhibitors with a single component can no longer meet the anti-corrosion requirements under high-temperature conditions. It is usually necessary to add a synergist to the main agent to improve the anti-corrosion effect
Alkyne alcohols are the most commonly used high-temperature acidification corrosion inhibitor synergists, but these substances are highly volatile. After being added to the acid solution, some active ingredients will volatilize together with hydrochloric acid, which not only reduces its active ingredients, It causes a waste of resources, and at the same time, it is also a highly toxic substance, which seriously endangers the health of construction workers.

Method used

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  • High-temperature compound acidizing corrosion inhibitor and preparation method thereof
  • High-temperature compound acidizing corrosion inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 2 mol of quinoline in a reaction kettle, use 200 mL of absolute ethanol as a solvent, heat up to 78°C and reflux for 1 hour, then add 1 mol of 1,3-dibromo-2-propanol, continue heating and reflux for 24 hours, then cool and filter, each time with 60 mL 1,3-diquinoline propanol bromide was obtained by recrystallization three times from anhydrous ethanol-acetone mixture with a volume ratio of 1:1. Mix 1,3-diquinoline propanol bromide, rosinamine, and ethanol at a mass ratio of 60:15:25 to obtain a high-temperature composite acidification corrosion inhibitor.

[0027] In 15% HCl solution, 0.3% mass fraction of this high-temperature compound acidification corrosion inhibitor can make the corrosion inhibition rate of N80 oil pipe steel reach 99.19% at 90°C; 0.5% mass fraction of this high-temperature compound acidification corrosion inhibitor can The corrosion inhibition rate of N80 oil pipe steel at 90°C reaches 99.64%.

Embodiment 2

[0029] Take 2.4mol of quinoline in a reaction kettle, use 240mL of absolute ethanol as a solvent, heat up to 78°C and reflux for 1 hour, then add 1 mol of 1,3-dibromo-2-butanol, continue to heat and reflux for 12 hours, then cool and filter. 120 mL of anhydrous ethanol-acetone mixture with a volume ratio of 1:1 was recrystallized three times to obtain 1,4-diquinoline butanol bromide. Mix 1,4-diquinoline butanol bromide, rosinamine, and formaldehyde in a mass ratio of 70:20:10 to obtain a high-temperature composite acidification corrosion inhibitor.

[0030] In 15% HCl solution, 0.3% mass fraction of this high-temperature composite acidification corrosion inhibitor can make the corrosion inhibition rate of N80 oil pipe steel reach 99.23% at 90 °C; 0.5% mass fraction of this high-temperature composite acidification corrosion inhibitor can Make the corrosion inhibition rate of N80 oil pipe steel reach 99.67% at 90°C.

Embodiment 3

[0032] Take 2mol of pyridine in a reaction kettle, 400mL of absolute ethanol as a solvent, heat up to 78°C and reflux for 0.5h, then add 1mol of 1,3-dichloro-2-propanol, and continue heating to reflux. After reacting for 24 hours, cool and filter, and recrystallize 3 times with 100 mL of anhydrous ethanol-acetone mixture with a volume ratio of 1:1 each time to obtain 1,3-dipyridinepropanol chloride. Mix 1,3-dipyridylpropanol chloride, rosinamine, and ethanol uniformly in a mass ratio of 60:20:20 to obtain a high-temperature composite acidification corrosion inhibitor.

[0033] In 15% HCl solution, 0.4% mass fraction of this high-temperature composite acidification corrosion inhibitor can make the corrosion inhibition rate of N80 oil pipe steel reach 99.02% at 90 °C; 0.5% mass fraction of this high-temperature composite acidification corrosion inhibitor can Make the corrosion inhibition rate of N80 oil pipe steel reach 99.39% at 90°C.

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Abstract

The invention provides a high-temperature compound acidizing corrosion inhibitor and a preparation method thereof. The high-temperature compound acidizing corrosion inhibitor is prepared from, by mass, 60-80 parts of hydroxyl bis-quaternary ammonium salt, 10-20 parts of synergist and 10-25 parts of solvent. The preparation method includes the preparation steps that (1) the hydroxyl bis-quaternary ammonium salt is synthesized, a nitrogen heterocyclic compound is selected to be placed in a reaction kettle, absolute ethyl alcohol is used as the solvent, reflux is conducted when the temperature is raised to 78 DEG C through heating, then bis-halohydrin is added, cooling and filtering are conducted after reflux is conducted for 12-24 hours through continuous heating, absolute ethyl alcohol-acetone mixed liquor is used for recrystallization three times, and accordingly the hydroxyl bis-quaternary ammonium salt is obtained; and (2) the synthesized hydroxyl bis-quaternary ammonium salt is evenly mixed with the synergist and the solvent so that the high-temperature compound acidizing corrosion inhibitor can be obtained. The high-temperature compound acidizing corrosion inhibitor prepared through the method has the advantages of being good in acid-soluble property, small in dosage, high in inhibition rate, low in toxicity, environmentally friendly and the like.

Description

technical field [0001] The invention relates to the technical field of metal surface corrosion and protection, in particular to a high-temperature compound acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] In the process of oilfield construction, acidizing is an important and effective measure to increase the production of oil and gas wells and injection wells. The commonly used acidizing reagent is 15-28% hydrochloric acid solution. Under certain pressure conditions, the acid liquid is injected into the formation, and the acid liquid can dissolve or dissolve with the rock cement and the blockages in the formation pores and fractures, so as to improve the porosity and permeability of the formation, and achieve increased production and injection. the goal of. However, the acid liquid has a corrosive effect on downhole pipe strings and metal equipment, especially when high-concentration hydrochloric acid is used for acidificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/04
Inventor 任占春马收卢娜娜左家强黄波张子麟李爱山张潦源张军峰刘伟隋文
Owner CHINA PETROLEUM & CHEM CORP
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