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Corrosion inhibitor for gas dehydration glycol regeneration unit in gas field

A regenerative device and ethylene glycol technology, which is applied in corrosion inhibition of gas production equipment and gas production in oil and gas fields, can solve problems such as corrosion and perforation of regeneration towers, and achieve the effects of prolonging life, accelerating dehydration speed and low chemical degradation rate

Active Publication Date: 2011-12-21
PETROCHINA CO LTD
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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 provide a corrosion inhibitor for gas field gas dehydration glycol regeneration device to solve or slow down the severe corrosion and even perforation of process pipelines, valves, regeneration towers and other parts of the gas field gas dehydration glycol regeneration system

Method used

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  • Corrosion inhibitor for gas dehydration glycol regeneration unit in gas field
  • Corrosion inhibitor for gas dehydration glycol regeneration unit in gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Preparation of composite corrosion inhibitor for gas field gas dehydration ethylene glycol regeneration unit: at room temperature, add each component into the reactor by weight, stir for 45 minutes, and stir evenly; the weight of each component is: 12 0.5 part of alkyl hydroxyethyl imidazoline, 0.1 part of methyl pentynol; 0.2 part of hydroxyethylidene diphosphonic acid, 16 parts of triethanolamine, 0.5 part of Mannich base, 0.1 part of dehydroascorbic acid; Hydroquinone 0.03 part. The hanging plate experiment was carried out indoors, and the experimental results are as follows:

[0019] Indoor experiment effect table

[0020] dosage

Embodiment 2

[0021] Example 2: The preparation of the composite corrosion inhibitor for the gas field gas dehydration glycol regeneration unit is the same as that in Example 1. The parts by weight of each component are: 0.45 parts of cycloalkyl KLSS-A imidazoline; 0.13 parts of methylpentynol; 0.3 parts, 18 parts of triethanolamine, 0.35 parts of Mannich base, 0.12 parts of dehydroascorbic acid; 0.06 parts of tert-butyl hydroquinone. Use: Add at the inlet of the ethylene glycol aqueous solution of the ethylene glycol dehydration regeneration equipment; detect the pH value of the liquid in the ethylene glycol rich liquid tank; etchant. Glycol dehydration speed increased by 20%. The on-site use effect is as follows:

[0022] On-site use effect table

[0023]

Embodiment 3

[0024] Example 3: The method of preparation and use of the composite corrosion inhibitor for gas field gas dehydration glycol regeneration unit is the same as that of Example 2. The parts by weight of each component are: 0.55 parts of carboxymethyl amphoteric imidazoline; 0.14 parts of methylpentynol; 0.45 parts of hydroxyethylidene diphosphonic acid, 17 parts of triethanolamine, 0.45 parts of Mannich base, and 0.14 parts of dehydroascorbic acid Parts; 0.09 parts of tert-butyl hydroquinone. Glycol dehydration speed increased by 22%.

[0025] On-site use effect table

[0026]

[0027] After 9 months of field tests, it has been proved that the ethylene glycol regeneration equipment is in stable operation, has no effect on the performance of ethylene glycol, has no side effects on the operation of reboilers, regeneration towers and other equipment, and can control the corrosion of ethylene glycol regeneration equipment to within 0.20mm / a or less; after equipment maintenance ...

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Abstract

The invention relates to a gas field gas dehydrated ethanediol regenerator corrosion inhibitor, which is applied to the technical field of oil gas field gas extraction equipment corrosion inhibition and belongs to a special composite corrosion inhibitor for inhibiting the corrosion of a gas field gas dehydrated ethanediol regenerator. The gas field gas dehydrated ethanediol regenerator corrosion inhibitor comprises the following ingredients in weight parts: 0.35 to 0.55 part of imidazolone, 0.09 to 0.15 part of dormison, 0.1 to 0.5 part of 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDPA), 16 to 18 parts of triethanolamine, 0.35 to 0.55 part of Mannich base, 0.09 to 0.15 part of dehydroascorbic acid and 0.02 to 0.1 part of ditertbutylhydroquinone. The gas field gas dehydrated ethanediol regenerator corrosion inhibitor has the effect that the serious corrosion problems of serious corrosion in parts of process pipelines, valves, regeneration towers and the like of the existing gas field gas dehydrated ethanediol regenerating system , even perforation and the like are solved.

Description

technical field [0001] The invention relates to the technical field of gas production in oil and gas fields, in particular to the technical field of corrosion inhibition for gas production equipment. It is a special composite corrosion inhibitor that can successfully slow down the corrosion of the current gas field gas dehydration glycol regeneration unit. Background technique [0002] Currently, ethylene glycol is widely used in gas field gas dehydration systems. Since the ethylene glycol-rich solution (aqueous solution) can be regenerated at high temperature and oxidized by heat to generate organic acids during use, the pH value drops, and the ethylene glycol-rich solution becomes an acidic solution. At the same time, the dissolved oxygen in the ethylene glycol-rich solution , carbon dioxide and a small amount of hydrogen sulfide gas in natural gas, and the accumulation of bicarbonate ions and chloride ions in the associated water further strengthen the acidity of the eth...

Claims

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Application Information

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IPC IPC(8): C23F11/167C23F11/04B01D53/28B01D53/14
Inventor 何帆杨宏霞刘智勇丁亮
Owner PETROCHINA CO LTD
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