CN-121990774-A - Preparation method of carbon dioxide corrosion prevention material and corresponding cement slurry system

CN121990774ACN 121990774 ACN121990774 ACN 121990774ACN-121990774-A

Abstract

According to the preparation method of the carbon dioxide corrosion prevention material and the corresponding cement slurry system, the method comprises the steps of carrying out ultrasonic dispersion on kaolin with the kaolin mineral content being more than 95% in water to obtain a kaolin suspension, sequentially carrying out centrifugal dispersion, dehydration and superfine wet grinding treatment on the kaolin suspension added with an intercalator to obtain a micro-nano-scale kaolin material, then carrying out high-temperature calcination on the micro-nano-scale kaolin material to obtain micro-nano-scale metakaolin, and mixing the micro-nano-scale metakaolin and micro-nano-scale silicon dioxide powder according to a preset proportion to obtain the carbon dioxide corrosion prevention material. The kaolin adopted by the technical scheme has stability and chemical inertness at high temperature, and is subjected to ultrasonic dispersion, centrifugal dispersion, high-temperature calcination and the like to obtain micro-nano metakaolin which is uniformly distributed and has high durability, and then the micro-nano metakaolin is mixed with silicon dioxide to prepare the material with high carbon dioxide corrosion resistance.

Inventors

LIU LINSONG
GUO YUCHAO
ZHANG JIAYING
LIU ZISHUAI
ZHANG HAIZHI
LIU HUITING
QU CONGFENG
YU YONGJIN
ZHANG XIAOBING
QI FENGZHONG
ZHANG CHI
ZHANG HUA
XU PU

Assignees

中国石油天然气集团有限公司
中国石油集团工程技术研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The preparation method of the carbon dioxide corrosion prevention material is characterized by comprising the following steps: Carrying out ultrasonic dispersion on kaolin with the kaolin mineral content of more than 95% in water to obtain a kaolin suspension; Sequentially performing centrifugal dispersion, dehydration and superfine wet grinding treatment on the kaolin suspension added with the intercalating agent to obtain a micro-nano high-grade kaolin material; Calcining the micro-nano-scale high-temperature kaolin material at high temperature to obtain micro-nano-scale metakaolin; And mixing the micro-nano metakaolin and the micro-nano silicon dioxide powder according to a preset proportion to obtain the carbon dioxide corrosion prevention material.
2. The method of claim 1, wherein the high temperature calcining of the micro-nano-scale kaolin material to obtain micro-nano-scale metakaolin comprises: uniformly spreading the micro-nano high-kaolin material in a calciner according to the thickness of less than 5 cm; Raising the furnace temperature of the calciner from room temperature to between 700 ℃ and 850 ℃ at a temperature rise rate of 5 ℃ per minute; And when the furnace temperature reaches 700-850 ℃, keeping constant-temperature calcination for 2-3 h to obtain the micro-nano metakaolin.
3. The method of claim 2, wherein prior to said high temperature calcining of the micro-nano-scale kaolin material to obtain micro-nano-scale metakaolin, the method further comprises: and uniformly crushing the micro-nano high-kaolin material to obtain the micro-nano high-kaolin material with uniform granularity.
4. A method according to any one of claims 1 to 3, wherein the step of subjecting the kaolin suspension to which the intercalating agent is added to centrifugal dispersion, dewatering, and ultra-fine wet grinding in this order, comprises: Adding an intercalating agent into the kaolin suspension, performing centrifugal separation, and washing the intercalating agent which is excessively attached with ethanol to obtain a composite product; Carrying out dehydration treatment on the composite product to obtain a dehydrated composite product; And adding a sodium hexametaphosphate dispersing agent into the dehydrated composite product, and carrying out superfine wet grinding to obtain the micro-nano high-kaolin material.
5. The method of claim 4, wherein the micro-nano-scale kaolin material has a particle size between 1 μm and 10 μm.
6. A method according to any one of claims 1 to 3, wherein the mixing of the micro-nano metakaolin and micro-nano silica powder in a predetermined ratio provides the carbon dioxide corrosion resistant material, comprising: Mechanically mixing the micro-nano metakaolin and the micro-nano silicon dioxide powder according to the preset proportion to obtain a mixture; And mixing and grinding the mixture by an air flow mill to obtain the carbon dioxide corrosion resistant material.
7. A cement paste system capable of preventing carbon dioxide corrosion, which is characterized by comprising the carbon dioxide corrosion preventing material, silicate cement, water and an additive according to any one of claims 1 to 6.
8. The carbon dioxide corrosion resistant cement slurry system of claim 7, wherein said admixture comprises at least one of a fluid loss additive, a reinforcing material, a dispersant, a moderator, an anti-gas channeling agent, a toughening material, a defoamer, and a suds suppressor.
9. The carbon dioxide corrosion resistant cement slurry system of claim 7, wherein the Portland cement is of the order of 100; accordingly, the water is on the order of 47 to 53 and the carbon dioxide corrosion resistant material is on the order of 5 to 15.
10. A carbon dioxide corrosion resistant cement slurry system according to any of claims 7 to 9, wherein the Portland cement is a class G oil well cement.

Description

Preparation method of carbon dioxide corrosion prevention material and corresponding cement slurry system Technical Field The application relates to the technical field of oil and gas well cementation, in particular to a preparation method of a carbon dioxide corrosion prevention material and a corresponding cement slurry system. Background Along with the rapid development of economy, the demands of various industries on high-performance anti-corrosion materials are continuously increased, and the carbon dioxide corrosion prevention materials are widely applied to the fields of petroleum, natural gas, chemical industry, ocean engineering and the like, so that the safe and reliable operation of concrete in a high-corrosion environment is ensured. Carbon dioxide corrosion can cause leakage or cracking of concrete or well cementing cement sheath, particularly in the high risk industries of petroleum, natural gas, and the like. Research on carbon dioxide corrosion prevention materials is helpful for reducing potential safety hazards and protecting personnel and environment. At present, the used carbon dioxide corrosion prevention materials mainly comprise organic corrosion prevention additives including resin, latex and the like, and external additives with corrosion prevention performance including clay minerals, micro-silicon, fly ash, superfine slag and the like. However, these materials are not stable and are liable to form voids or cracks inside, resulting in poor corrosion protection. Therefore, how to develop a high-performance material for preventing carbon dioxide corrosion is a technical problem to be solved. Disclosure of Invention The application provides a preparation method of a carbon dioxide corrosion-resistant material and a corresponding cement slurry system, which aim at solving the problems of how to develop a high-performance carbon dioxide corrosion-resistant material in the prior art. In a first aspect, an embodiment of the present application provides a method for preparing a carbon dioxide corrosion resistant material, including: Carrying out ultrasonic dispersion on kaolin with the kaolin mineral content of more than 95% in water to obtain a kaolin suspension; Sequentially performing centrifugal dispersion, dehydration and superfine wet grinding treatment on the kaolin suspension added with the intercalating agent to obtain a micro-nano high-grade kaolin material; Calcining the micro-nano-scale high-temperature kaolin material at high temperature to obtain micro-nano-scale metakaolin; And mixing the micro-nano metakaolin and the micro-nano silicon dioxide powder according to a preset proportion to obtain the carbon dioxide corrosion prevention material. In one or more embodiments, the high temperature calcining the micro-nano-scale kaolin material to obtain micro-nano-scale metakaolin comprises: uniformly spreading the micro-nano high-kaolin material in a calciner according to the thickness of less than 5 cm; Raising the furnace temperature of the calciner from room temperature to between 700 ℃ and 850 ℃ at a temperature rise rate of 5 ℃ per minute; And when the furnace temperature reaches 700-850 ℃, keeping constant-temperature calcination for 2-3 h to obtain the micro-nano metakaolin. In one or more embodiments, prior to said high temperature calcining of the micro-nano-scale kaolin material to obtain micro-nano-scale metakaolin, the method further comprises: and uniformly crushing the micro-nano high-kaolin material to obtain the micro-nano high-kaolin material with uniform granularity. In one or more embodiments, the kaolin suspension to which the intercalating agent is added is subjected to centrifugal dispersion, dehydration, and superfine wet grinding in sequence, to obtain a micro-nano-sized kaolin material, which comprises: Adding an intercalating agent into the kaolin suspension, performing centrifugal separation, and washing the intercalating agent which is excessively attached with ethanol to obtain a composite product; Carrying out dehydration treatment on the composite product to obtain a dehydrated composite product; And adding a sodium hexametaphosphate dispersing agent into the dehydrated composite product, and carrying out superfine wet grinding to obtain the micro-nano high-kaolin material. Preferably, the micro-nano-scale kaolin material has a particle size between 1 μm and 10 μm. In one or more embodiments, the mixing the micro-nano metakaolin and the micro-nano silicon dioxide powder according to a preset proportion to obtain the carbon dioxide corrosion resistant material comprises: Mechanically mixing the micro-nano metakaolin and the micro-nano silicon dioxide powder according to the preset proportion to obtain a mixture; And mixing and grinding the mixture by an air flow mill to obtain the carbon dioxide corrosion resistant material. In a second aspect, the embodiment of the application provides a carbon dioxide corrosion-resistant cement, which comprises a ca