Cleaning solution for removing calcium carbonate scale and preparation method and application of cleaning solution

A cleaning solution and clear water technology, applied in the field of chemical descaling, can solve the problems of difficult biodegradation, low scale dissolution efficiency, harmful to human health, etc., achieve good scale inhibition effect, slow down scaling speed, and high removal rate

Active Publication Date: 2018-01-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The cleaning solution used to remove calcium carbonate scale provided by the prior art

Method used

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  • Cleaning solution for removing calcium carbonate scale and preparation method and application of cleaning solution

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Example Embodiment

[0038] Example 1

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

[0040] The cleaning solution provided in this embodiment is prepared by the following method:

[0041] According t...

Example Embodiment

[0042] Example 2

[0043] This embodiment provides a cleaning solution for removing calcium carbonate scale. The cleaning solution includes the following components in mass percentage: 2-hydroxypropane-1,2,3-tricarboxylic acid 5%, diethyltriamine Pentaacetic acid 15%, penetration cosolvent 3%, oleic hydroxyethyl imidazoline 0.08%, the balance is water, and the pH of the cleaning solution is 6.2. Among them, the penetration aid used in Example 2 can be prepared by the following method: place 12kg of polydimethylsiloxane, 160kg of glycerol and 240kg of water in a 1000L enamel reactor, heat to 35°C, and stir 25min, then add 1.1kg sodium butyl naphthalene sulfonate, 55kg sodium hexametaphosphate and 220kg water, then lower the temperature of the reactor to 18℃, stir for 35min under constant temperature conditions, to obtain the penetration aid used in Example 2 .

[0044] The cleaning solution provided in this embodiment is prepared by the following method:

[0045] According to the m...

Example Embodiment

[0046] Example 3

[0047] This embodiment provides a cleaning solution for removing calcium carbonate scale. The cleaning solution includes the following components in mass percentage: 2,3-dihydroxysuccinic acid 6%, and hydroxyethylethylenediaminetriacetic acid 20% , Penetration cosolvent 5%, mercaptobenzothiazole 0.1%, the balance is water, and the pH of the cleaning solution is 5.8. Among them, the penetration cosolvent used in Example 3 can be prepared by the following method: put 10kg polyoxypropylene glycerol ether, 170kg dodecanol and 250kg clean water in a 1000L enamel reactor, heat to 40°C, stir for 30min, Then, 1.3 kg of sodium butyl naphthalene sulfonate, 50 kg of sodium hexametaphosphate and 200 kg of water were added, and then the temperature of the reactor was lowered to 20° C., and stirred at a constant temperature for 40 minutes to obtain the penetration aid used in Example 3.

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

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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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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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