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Application of an ester-containing diquaternary ammonium salt as a corrosion inhibitor for carbon steel oil and gas fields

A double quaternary ammonium salt and corrosion inhibitor technology is applied in the application field of ester-containing double quaternary ammonium salt as a corrosion inhibitor for carbon steel oil and gas fields. It can solve the problems of anti-corrosion performance indicators and zero pollutant discharge. Significant application value, strong sustained action ability, and wide-ranging effects

Inactive Publication Date: 2018-11-09
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic corrosion inhibitors currently occupying a major market share, such as imidazolines and quaternary ammonium salts, still have the problem of anti-corrosion performance indicators and zero pollutant discharge that cannot be taken into account. Therefore, non-toxic and environmentally friendly corrosion inhibitors will become the future development of corrosion inhibitors. bottleneck

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective corrosion inhibitor component is 1,3-bis[(2-ethyl laurate) bimethyl Quaternary ammonium group]-2-hydroxypropyl dichloride, the medium is 3% sodium chloride solution, the dosage is 1L, carbon dioxide gas is passed into the solution to saturation, and 1,3-bis[(2-ethyl laurate)bis The effective content of methylquaternary ammonium]-2-hydroxypropyl dichloride is 10mg, the temperature is 25°C, and the immersion time is 3 days.

[0021] The corrosion inhibition efficiency obtained through the experimental test is: weight loss 35.1%, electrochemical impedance spectroscopy 37.7%, and potentiodynamic polarization curve 37.2%, indicating that the compound has a certain corrosion inhibition effect.

Embodiment 2

[0023] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective corrosion inhibitor component is 1,3-bis[(2-ethyl laurate) bimethyl Quaternary ammonium group]-2-hydroxypropyl dichloride, the medium is 3% sodium chloride solution, the dosage is 1L, carbon dioxide gas is passed into the solution to saturation, and 1,3-bis[(2-ethyl laurate)bis The effective content of methyl quaternary ammonium base]-2-hydroxypropyl dichloride is 20mg, the temperature is 25°C, and the immersion time is 3 days.

[0024] The corrosion inhibition efficiency obtained through the experimental test is: weight loss 41.6%, electrochemical impedance spectrum 42.4%, dynamic potential polarization curve 42.8%, indicating that the compound has a certain corrosion inhibition effect.

Embodiment 3

[0026] Conditions: The experimental material is carbon steel (Fe: 99.5%, Mn: 0.4-0.5%, C: 0.1-0.2%), and the effective corrosion inhibitor component is 1,3-bis[(2-ethyl laurate) bimethyl Quaternary ammonium group]-2-hydroxypropyl dichloride, the medium is 3% sodium chloride solution, the dosage is 1L, carbon dioxide gas is passed into the solution to saturation, and 1,3-bis[(2-ethyl laurate)bis The effective content of methylquaternary ammonium]-2-hydroxypropyl dichloride is 30mg, the temperature is 25°C, and the immersion time is 3 days.

[0027] The corrosion inhibition efficiency obtained through the experimental test is: weight loss 55.7%, electrochemical impedance spectroscopy 55.5%, and potentiodynamic polarization curve 56.8%, indicating that the compound has a certain corrosion inhibition effect.

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Abstract

The invention belongs to the technical field of steel (carbon steel) corrosion and protection and particularly relates to an application of ester-group-containing biquaternary ammonium salt as a carbon steel oil-gas field corrosion inhibitor. The effective constituent of the carbon steel oil-gas field corrosion inhibitor is 1,3-bis[(2-ethyl laurate) dimethyl quaternary ammonio]-2-hydroxypropyl-dichloro. The carbon steel oil-gas field corrosion inhibitor can prevent carbon steel materials and products of the carbon steel materials from generating a corrosion electrochemical reaction (local corrosion and general corrosion) when the carbon steel materials and the products of the carbon steel materials make contact with a saturated carbon dioxide saline solution in a oil-gas field environment or under a corresponding acid condition. The carbon steel oil-gas field corrosion inhibitor is small in dosage, free from toxicity, environmentally friendly, high in efficiency, high in continuous acting capacity and capable of effectively restraining corrosion damage to the carbon steel and has significant application value and broad market prospect.

Description

technical field [0001] The invention belongs to the technical field of steel (carbon steel) corrosion and protection, and in particular relates to the application of an ester group-containing bis-quaternary ammonium salt as a corrosion inhibitor for carbon steel oil and gas fields. Background technique [0002] Carbon dioxide corrosion is the most common form of corrosion in the production process of oil and gas fields. It seriously threatens the safe production of the petrochemical industry, often causing huge economic losses and even endangering personal safety. As a low-cost, effective and easy-to-implement method, corrosion inhibitor protection technology is especially suitable for oil and gas well production and collection systems. For internal corrosion, the advantage is more obvious. The use of corrosion inhibitors can take into account the protection of oil casings, downhole collection tools, and uphole transportation equipment and pipelines. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
CPCC23F11/143
Inventor 曹琨张青
Owner NEIJIANG NORMAL UNIV
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