Anticorrosive agent suitable for CO2 corrosion resistant cement paste system and preparation method of anticorrosive agent

A kind of anti-corrosion agent and system technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem that cement stone cannot be continuously anti-corrosion, etc., and can meet the requirements of anti-CO2 corrosion, stable compressive strength, and good stability Effect

Inactive Publication Date: 2021-01-19
中石化石油工程技术服务有限公司 +2
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of anti-CO 2 Preparation method and product of anti-corrosion agent for corroding cement slurry system, to solve the problem of cement stone being covered by CO 2 The problem of inability to sustain corrosion after the intrusion of corrosive media

Method used

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  • Anticorrosive agent suitable for CO2 corrosion resistant cement paste system and preparation method of anticorrosive agent
  • Anticorrosive agent suitable for CO2 corrosion resistant cement paste system and preparation method of anticorrosive agent
  • Anticorrosive agent suitable for CO2 corrosion resistant cement paste system and preparation method of anticorrosive agent

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preparation example Construction

[0017] Suitable for anti-CO 2 The specific steps of the preparation method of the corrosion inhibitor of the corrosion cement slurry system:

[0018] 1) Put the reaction monomer formaldehyde in the reaction device, raise the reaction temperature to 40~45°C, add the first part of the reaction monomer, adjust the pH value with NaOH solution, and make the pH of the reaction system weakly alkaline;

[0019] 2) Raise the temperature to 65~70°C and react for 50 minutes, adjust the pH value of the reaction system to acidic 4.5~5.4 with formic acid solution, and continue the reaction for 20 minutes;

[0020] 3) Adjust the pH value of the reaction to 5.4~6 with NaOH solution, add the second part of the reaction monomer, and react at constant temperature for 25 minutes;

[0021] 4) Use NaOH solution to adjust the pH value of the reaction to 6~6.5, add the third part of the reaction monomer, and continue the constant temperature reaction for 15 minutes;

[0022] 5) Adjust the pH value ...

Embodiment 1

[0024] A suitable for anti-CO 2 Preparation method of anti-corrosion agent for corrosive cement slurry system (referred to as anti-corrosion resin ZJ-1).

[0025] Weigh 48g of formaldehyde and put it into a three-necked flask to completely dissolve, raise the temperature to 42°C, add 42g of the first part of the monomer and use NaOH solution to adjust the pH of the system to be weakly alkaline, raise the temperature to 67°C and react at a constant temperature for 40min, and use formic acid to adjust the pH of the system to 4.5 Continue the reaction at constant temperature for 20 minutes, adjust the pH value of the reaction to 6 with NaOH solution, add 15 g of the second part of the monomer, and react at the constant temperature for 25 minutes; adjust the pH value of the reaction to 6.5 with NaOH solution, add 3 g of the third part of the monomer, and continue the constant temperature After reacting for 15 minutes, adjust the pH value of the reaction to 8 with NaOH solution, co...

Embodiment 2

[0027] A suitable for anti-CO 2 Preparation method of anti-corrosion agent for corrosive cement slurry system (referred to as anti-corrosion resin ZJ-2).

[0028] Weigh 48g of formaldehyde and put it into a three-necked flask to completely dissolve, raise the temperature to 42°C, add the first part of monomer 42g and use NaOH solution to adjust the pH of the system to be weakly alkaline, raise the temperature to 70°C for 50min, and adjust the pH of the system to 5.0 Continue to react at constant temperature for 20 minutes, adjust the pH value of the reaction to 5.5 with NaOH solution, add 15 g of the second part of monomer, and react at constant temperature for 25 minutes; adjust the pH value of the reaction to 6 with NaOH solution, add 3 g of the third part of monomer, and continue at constant temperature After reacting for 15 minutes, adjust the pH value of the reaction to 9 with NaOH solution, cool down to 40°C and discharge to obtain the synthesized anti-corrosion resin ZJ...

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Abstract

The invention relates to a preparation method of an anticorrosive agent suitable for a CO2 corrosion resistant cement paste system, wherein the method comprises the steps: putting formaldehyde into areaction device, raising the reaction temperature to 40-45 DEG C, adding a first part of reaction monomer, and regulating the pH value of the reaction system to alkalescence by using alkali; raising the temperature to 65-70 DEG C for reaction, adjusting the pH value of the reaction system to be acidic by using acid, and continuing the reaction; adjusting the pH value of the reaction to 5.4-6 by using an alkaline solution, adding a second part of reaction monomer, and reacting at a constant temperature; adjusting the pH value of the reaction to 6-6.5 by using an alkaline solution, adding a third part of reaction monomer, and continuing the constant-temperature reaction for 15-20 min; and adjusting the pH value of the reaction to 8-9 by using an alkaline solution, cooling and discharging. The synthesized anticorrosive agent is milk white liquid, is stable in performance and good in water solubility, and has good compatibility and corrosion resistance with cement paste.

Description

technical field [0001] The invention relates to a kind of anti-CO2 in the field of oil well chemical materials 2 The invention discloses a preparation method and product of an anticorrosion agent for corroding a cement slurry system. Background technique [0002] Currently, domestic oil well cement CO 2 Anti-corrosion materials mainly use ultra-fine inert materials and active silicon materials. For example, Sinopec Dezhou Research Institute added inert ultra-fine barite and other materials, and Li Guanying of Taiwan National Cheng Kung University added active materials such as fly ash and silica powder. The accumulation effect to reduce the permeability of cement stone and react with cement minerals to reduce the alkalinity of cement stone to improve the resistance of cement stone to CO 2 Corrosion performance, this method only weakens the exchange source of dissolved ions, and slows down the CO 2 The infiltration rate of the corrosive medium, once the corrosive medium en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/02C09K8/467
CPCC08G16/0225C08G16/0256C08G16/0231C09K8/467
Inventor 齐志刚曹会莲曹成章王毅高辉薛玉伟路志平苗勇饶鸿飞马丁李国峰解蒙
Owner 中石化石油工程技术服务有限公司
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