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A kind of imidazoline quaternary ammonium salt composite type corrosion inhibitor and preparation method thereof

A technology of imidazoline quaternary ammonium salt and corrosion inhibitor, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problems of long synthesis time, complex composition, oxygen embrittlement, etc., and achieve shortening effect time, raw materials are easy to obtain, and the effect of improving corrosion inhibition efficiency

Active Publication Date: 2017-12-15
广西经正科技开发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the comprehensive water content of oilfield wells continues to increase, and the produced water has high salinity and a large amount of corrosive substances, which may cause surface pitting, oxygen embrittlement, and weightlessness corrosion of construction equipment, oil and gas well pipes, and downhole metal tools. Candles, and sometimes may lead to sudden rupture of downhole pipes, resulting in serious economic losses; for these corrosion, the quick and effective way is to add corrosion inhibitors to slow down the corrosion of metals
However, due to the complex composition of oil and gas field sewage, the effect of a single corrosion inhibitor is not good, and it is difficult to meet the actual needs. In practice, most of the corrosion inhibitors are used in combination; Long synthesis time virtually increases the cost of power consumption, and the dosage is large, with certain toxicity and unstable performance, so it cannot be widely used in actual production

Method used

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  • A kind of imidazoline quaternary ammonium salt composite type corrosion inhibitor and preparation method thereof
  • A kind of imidazoline quaternary ammonium salt composite type corrosion inhibitor and preparation method thereof
  • A kind of imidazoline quaternary ammonium salt composite type corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the compound corrosion inhibitor of imidazoline quaternary ammonium salt is a suspension, and its components and their weight percentages are: imidazoline quaternary ammonium salt 11.6%, Fe 3 o 4 0.017% of particles, 1.7% of surface modifier, 5.8% of sodium gluconate, and the balance is water.

[0031] The preparation method of imidazoline quaternary ammonium salt composite corrosion inhibitor described in this example comprises the following steps:

[0032] (1) Add a small amount of ceramic particles and 0.1mol diethylenetriamine to a three-necked flask connected with a thermometer, a spherical condenser, and a stirrer, raise the temperature to 110°C and add 6.5g of calcium oxide as a water remover, and use a constant pressure separatory funnel Add 0.1mol methyl oleate drop by drop, finish dropping within 30 minutes, heat up to 140-150°C, carry out intermolecular amidation dealcoholization reaction for 3.5 hours; continue to stir and heat up to 200-21...

Embodiment 2

[0036] In this example, the imidazoline quaternary ammonium compound corrosion inhibitor is composed of components and their weight percentages are: imidazoline quaternary ammonium salt 20%, Fe 3 o 4 0.03% of particles, 3% of surface modifier, 7% of sodium gluconate, and the balance is water.

[0037] The preparation method of imidazoline quaternary ammonium salt composite corrosion inhibitor described in this example comprises the following steps:

[0038] (1) Add a small amount of ceramic particles and 0.18mol diethylenetriamine into a three-necked flask connected with a thermometer, a spherical condenser, and a stirrer, raise the temperature to 110°C and add 6.5g of calcium oxide as a water remover, and use a constant pressure separatory funnel Add 0.15mol methyl oleate drop by drop, finish dropping within 30 minutes, raise the temperature to 140-150°C, carry out intermolecular amidation dealcoholization reaction for 3.5 hours; continue to stir and heat up to 200-210°C, ca...

Embodiment 3

[0042] In this example, the imidazoline quaternary ammonium compound corrosion inhibitor consists of components and their weight percentages are: imidazoline quaternary ammonium salt 28.5%, Fe 3 o 4 0.1% of particles, 9.5% of surface modifier, 14.2% of sodium gluconate, and the balance is water.

[0043] The preparation method of imidazoline quaternary ammonium salt composite corrosion inhibitor described in this example comprises the following steps:

[0044] (1) Add a small amount of ceramic particles and 0.13mol tetraethylenepentamine to a three-necked flask connected with a thermometer, a spherical condenser, and a stirrer, raise the temperature to 110°C and add 6.5g of calcium oxide as a water remover, and use a constant pressure separatory funnel Add 0.1mol laurate drop by drop, finish dropping within 30 minutes, heat up to 150-160°C, carry out intermolecular amidation dealcoholization reaction for 5 hours; continue to stir and heat up to 210-220°C, carry out intramolec...

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Abstract

The invention provides an imidazoline-quaternary ammonium salt compound corrosion inhibitor and a preparation method thereof. The imidazoline-quaternary ammonium salt compound corrosion inhibitor is a suspension and contains the following components in percentage by weight: 10-30% of imidazoline-quaternary ammonium salt, 0.01-0.1% of Fe3O4, 1-10% of surfactant, 5-15% of sodium gluconate and the balance of water. According to the technical scheme, only after a little corrosion inhibitor is needed, a better corrosion inhibition effect can be achieved; besides, the preparation process is environment-friendly and pollution-free, the raw materials are simple and easily available, and the production cost is low.

Description

technical field [0001] The invention relates to the fields of industrial water treatment and environmental protection, in particular to an imidazoline quaternary ammonium salt complex corrosion inhibitor and a preparation method thereof. Background technique [0002] In recent years, a considerable part of my country's onshore oilfields have entered the middle and late stages of water injection production, and acidification technical measures need to be used to increase production of oil and gas wells and increase injection of water injection wells; at the same time, with the increase of acid concentration and the emergence of deep well mining, corrosion problems have become more and more serious. more serious. At the same time, the comprehensive water content of oilfield wells continues to increase, and the produced water has high salinity and a large amount of corrosive substances, which may cause surface pitting, oxygen embrittlement, and weightlessness corrosion of constr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54C09K8/74C23F11/04
CPCC09K8/54C09K8/74C09K2208/32C23F11/04
Inventor 黄映恒李燕覃金凤韦菲罗春林侯蕾覃筱燕陈清
Owner 广西经正科技开发有限责任公司