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A kind of cleaning solution for removing calcium carbonate scale and its preparation method and application

A technology of cleaning liquid and clear water, which is applied in the field of chemical descaling, can solve the problems of harmfulness to human health, difficulty in biodegradation, and low efficiency of scale dissolution, and achieve the effects of slowing down the speed of scaling, good effect of scale inhibition, and slowing down the speed of corrosion

Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The cleaning solution used to remove calcium carbonate scale provided by the prior art has low scale dissolution efficiency, is not easy to biodegrade, and is harmful to human health

Method used

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  • A kind of cleaning solution for removing calcium carbonate scale and its preparation method and application

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Embodiment 1

[0039] The present embodiment provides a cleaning solution for removing calcium carbonate scale, the cleaning solution comprises the following components in mass percentage: 3% of 2-hydroxypropane-1,2,3-tricarboxylic acid, diethyltriamine 10% of pentaacetic acid, 2% of osmotic cosolvent, 0.05% of oleic acid hydroxyethyl imidazoline, the balance is water, and the pH value of the cleaning solution is 6.5. Among them, the penetration cosolvent used in Example 1 can be prepared by the following method: put 10kg of polydimethylsiloxane, 150kg of glycerol and 250kg of clear water in a 1000L enamel reaction kettle, heat to 30°C, and stir 20min, then add 1.2kg sodium butylnaphthalene sulfonate, 50kg sodium hexametaphosphate and 200kg clear water, then reduce the temperature of the reactor to 15°C, and stir for 30min under constant temperature conditions to obtain the osmotic cosolvent used in Example 1 .

[0040] The cleaning solution provided in this embodiment is prepared by the fo...

Embodiment 2

[0043] The present embodiment provides a cleaning solution for removing calcium carbonate scale, the cleaning solution comprises the following components in mass percentage: 2-hydroxypropane-1,2,3-tricarboxylic acid 5%, diethyltriamine 15% of pentaacetic acid, 3% of osmotic cosolvent, 0.08% of oleic acid hydroxyethyl imidazoline, the balance is water, and the pH value of the cleaning solution is 6.2. Wherein, the penetration co-solvent used in Example 2 can be prepared by the following method: 12kg of polydimethylsiloxane, 160kg of glycerin and 240kg of clear water are placed in a 1000L enamel reaction kettle, heated to 35°C, and stirred 25min, then add 1.1kg sodium butylnaphthalenesulfonate, 55kg sodium hexametaphosphate and 220kg clear water, then reduce the temperature of the reactor to 18°C, and stir for 35min under constant temperature conditions to obtain the osmotic cosolvent used in Example 2 .

[0044] The cleaning solution provided in this embodiment is prepared by ...

Embodiment 3

[0047] The present embodiment provides a cleaning solution for removing calcium carbonate scale, the cleaning solution includes the following components in mass percentage: 6% of 2,3-dihydroxysuccinic acid, 20% of hydroxyethyl ethylenediamine triacetic acid , 5% permeation aid solvent, 0.1% mercaptobenzothiazole, the balance is water, and the pH value of the cleaning solution is 5.8. Among them, the permeation co-solvent used in Example 3 can be prepared by the following method: put 10kg of polyoxypropylene glyceryl ether, 170kg of lauryl alcohol and 250kg of clear water in a 1000L enamel reaction kettle, heat to 40°C, and stir for 30min. Then add 1.3kg of sodium butylnaphthalene sulfonate, 50kg of sodium hexametaphosphate and 200kg of clear water, then lower the temperature of the reactor to 20°C, and stir for 40min at a constant temperature to obtain the osmotic cosolvent used in Example 3.

[0048] The cleaning solution provided in this embodiment is prepared by the followi...

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Abstract

The invention discloses a cleaning solution for removing calcium carbonate scale and a preparation method and application of the cleaning solution, and belongs to the field of chemical descaling. Thecleaning solution comprises, by mass, 3%-8% of phosphorus-free organic acid complexing agent, 10%-25% of phosphorus-free chelating agent, 2%-6% of penetration cosolvent, 0.05%-0.15% of corrosion inhibitor, and the balance water. The corrosion inhibitor is oleic acid imidazoline corrosion inhibitor and / or thiazole corrosion inhibitor. The penetration cosolvent is prepared by the following steps that anionic surfactant, polyols and clean water are added into a reaction still and heated to 30-50 DEG C, stirring is conducted for 20-40 minutes, sodium hexametaphosphate, sodium but and the clean water are added, the temperature is reduced to 15-25 DEG C, stirring is conducted for 30-50 minutes under the constant temperature conditions, and the penetration cosolvent is obtained; and the mass ratio of the anionic surfactant, the polyols to the clean water added for the first time is 1:10-20:20-30, the mass ratio of the sodium but, the sodium hexametaphosphate to the clean water added for the second time is 1:40-50:80-200, and the mass percent of the sodium but accounted for the penetration cosolvent is 0.16-0.3%. The cleaning solution is high in scale dissolving rate, good in scale inhibition effect, safe and environmentally friendly, and good in biodegradability.

Description

technical field [0001] The invention relates to the field of chemical descaling, in particular to a cleaning solution for removing calcium carbonate scale, its preparation method and application. Background technique [0002] In the oil field water injection system, due to the change of production conditions and the difference in composition between the injected liquid and the original liquid in the oil layer, the chemical balance of the liquid in the oil layer is destroyed and sedimentation occurs. Precipitation can adhere to oil well equipment or block water injection channels, seriously affecting the normal operation of oilfield production. For example, oilfield water injection has high salinity, high temperature, high carbon dioxide content, and high calcium ion content in the oil reservoir. When the crude oil flows from the high-pressure oil layer to the low-pressure wellbore during the oil field production, the carbon dioxide in the injection water of the oil layer is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G5/032
Inventor 高乃煦谢刚巨登峰闫海俊姜伟祺闫暄崎秦忠海
Owner PETROCHINA CO LTD
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