Cleaning fluid for removing rust, preparation method and application thereof

A technology of cleaning liquid and rust, which is applied in the field of cleaning liquid for removing rust, can solve the problems of eutrophication of water body, slow scale dissolution rate, hydrogen embrittlement of atomic hydrogen, etc., to slow down the corrosion rate, increase the scale dissolution rate, and slow down hydrogen embrittlement Effect

Active Publication Date: 2018-04-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of realizing the present invention, the inventor has found that there are at least the following problems in the prior art: the existing cleaning solution for removing rust has a slow scale dissolution rate and a low scale removal rate, and the atomic hydrogen produced by the reaction is extremely easy Formation of hydrogen embrittlement, causing stress concentration
In addition, the phosphoric acid in the existing cleaning solution will cause eutrophication of the water body and cause environmental pollution

Method used

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preparation example Construction

[0051] In a second aspect, an embodiment of the present invention provides a method for preparing the above-mentioned cleaning solution, which specifically includes the following steps:

[0052] Add clean water into the liquid mixing tank, add organic acid, organic acid salt, chelating agent, osmotic cosolvent and corrosion inhibitor in sequence under stirring, and stir for 20-40 minutes to obtain the cleaning solution.

[0053] The preparation method has a simple process, does not require complex equipment, and has low cost, which is beneficial to popularization and application of the cleaning solution provided by the embodiment of the present invention.

[0054] In a third aspect, an embodiment of the present invention provides an application of the above-mentioned cleaning solution in removing rust in an oil field.

[0055] The cleaning solution provided by the embodiments of the present invention has a good ability to remove rust generated in various positions in the oil f...

Embodiment 1

[0072] This embodiment provides a cleaning solution for removing rust, and the cleaning solution includes the following components in mass percentages based on the total mass of the cleaning solution as 100%:

[0073] 2-Hydroxypropane-1,2,3-tricarboxylic acid, 5%;

[0074] 8-Hydroxyquinoline citrate, 2.15%;

[0075] Tetrasodium glutamate diacetate, 10%;

[0076] Penetration aid, 3%;

[0077] 2-methyl-2-imidazoline, 0.1%;

[0078] Water, 79.75%.

[0079] Wherein, the penetration co-solvent is prepared by the following method:

[0080] Weigh 3kg of sodium dodecylbenzenesulfonate, 200kg of ethylene glycol and 285kg of clear water according to the measurement and pour them into a 1000L enamel reaction kettle, heat the temperature of the reaction kettle to 40°C, stir and react for 30min, and then continue to add 40kg of tripolyphosphine into the reaction kettle sodium dodecylbenzenesulfonate, 16kg of sodium dodecylbenzenesulfonate, and 260kg of clear water with a pH of 6.5 to ...

Embodiment 2

[0092] This embodiment provides a cleaning solution for removing rust, and the cleaning solution includes the following components in mass percentages based on the total mass of the cleaning solution as 100%:

[0093] 2-Hydroxypropane-1,2,3-tricarboxylic acid, 10%;

[0094] 8-Hydroxyquinoline citrate, 4.5%

[0095] Tetrasodium glutamate diacetate, 10%;

[0096] Penetration aid, 4%;

[0097] 2-methyl-2-imidazoline, 0.1%;

[0098] Water, 71.4%.

[0099] Wherein, the penetration co-solvent is prepared by the following method:

[0100] Weigh 3kg of sodium dodecylbenzenesulfonate, 180kg of ethylene glycol and 270kg of clear water according to the measurement and pour them into a 1000L enamel reaction kettle, heat the temperature of the reaction kettle to 40°C, stir and react for 30min, and then continue to add 40kg of tripolyphosphine into the reaction kettle sodium dodecylbenzenesulfonate, 16kg of sodium dodecylbenzenesulfonate, and 320kg of clear water with a pH of 6.5 to 7....

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Abstract

The invention discloses a cleaning fluid for removing rust, a preparation method and application thereof, and belongs to the technical field of chemical rust removal. The cleaning fluid comprises 2%-10% of an organic acid, 0.5%-4.5% of an organic acid salt, 10%-25% of a chelating agent, 2%-6% of a permeation aiding solvent, 0.15%-0.25% of a corrosion inhibitor and the balance of water, wherein theorganic acid is 2-hydroxy propane-1,2,3-tricarboxylic acid and / or 2,3-dihydroxy succinic acid, the organic acid salt is 8-hydroxyquinoline citrate or 2,3-sodium tartrate, and the chelating agent is tetrasodium glutamate diacetate. The cleaning fluid is high in scale dissolving rate, high in descaling rate, low in corrosion rate, good in biodegradability is good and particularly suitable for removing the rust in the oil field.

Description

technical field [0001] The invention relates to the technical field of chemical rust removal, in particular to a cleaning solution for removing rust, a preparation method and an application thereof. Background technique [0002] Rust is a layer of dense, hard brown or gray-black substance formed after long-term accumulation at a certain temperature and pressure. Its main component is iron oxide α-FeOOH (common name: goethite, accounting for 60% Above), the chemical properties of α-FeOOH are unstable, and it is dehydrated and oxidized in the air, often as FeO, Fe 2 o 3 , Fe 3 o 4 The existence of oxides such as oxidants will cause corrosion of oilfield pipe networks, downhole pipe strings and downhole tools, and will also pollute the reservoir and cause reservoir blockage. Therefore, rust needs to be removed in time. [0003] At present, the commonly used rust removal methods mainly include physical cleaning and chemical cleaning. Among them, the physical cleaning metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/06C23G1/08
CPCC23G1/061C23G1/088
Inventor 胡书宝谢刚巨登峰杜清珍高乃煦闫海俊闫暄崎姜伟祺王润哲
Owner PETROCHINA CO LTD
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