铝酸钙水泥-矿渣体系的CO2腐蚀行为及微观结构研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3695-3702.

铝酸钙水泥-矿渣体系的CO₂腐蚀行为及微观结构研究

师伟¹, 龚泽相², 刘开强², 马疆³, 王军³, 代红³, 邓林³

1.中国石油集团工程材料研究院有限公司,西安 710000;
2.西南石油大学新能源与材料学院,成都 650100;
3.中国石油集团西部钻探工程有限公司工程技术研究院,克拉玛依 834000

收稿日期:2023-05-15 修订日期:2023-07-18 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 刘开强,副教授。E-mail:kaiqiangliu@swpu.edu.cn
作者简介:师伟(1986—),男,工程师。主要从事油水井套管损坏综合治理技术方面的研究。E-mail:shiwei006@cnpc.com.cn
基金资助:
国家自然科学基金(52104007)

CO₂ Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System

SHI Wei¹, GONG Zexiang², LIU Kaiqiang², MA Jiang³, WANG Jun³, DAI Hong³, DENG Lin³

1. China Petroleum Engineering Materials Research Institute Co., Ltd., Xi’an 710000, China;
2. School of New Energy and Materials, Southwest Petroleum University, Chengdu 650100, China;
3. Engineering Technology Research Institute of CNPC Western Drilling Engineering Co., Ltd., Karamay 834000, China

Received:2023-05-15 Revised:2023-07-18 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 针对CO₂易腐蚀硅酸盐水泥石、破坏水泥石结构完整性、诱发层间封隔失效等问题,本文利用矿渣改性铝酸钙水泥,研究了铝酸钙水泥-矿渣体系在60、80、100、120 ℃和纯CO₂条件下的抗压强度变化规律,并采用X射线衍射仪、热重分析仪和扫描电子显微镜测试了CO₂腐蚀对铝酸钙水泥-矿渣体系水化产物及微观结构的影响。结果表明:与纯铝酸钙水泥石相比,矿渣使铝酸钙水泥石水化产物转变为C₂ASH₈,大幅提高了水泥石早期抗压强度。当铝酸钙水泥与矿渣质量比为5 ∶5时,60 ℃养护14 d的铝酸钙水泥抗压强度提高了215.4%。经CO₂腐蚀后,铝酸钙水泥-矿渣体系水化产物由C₂ASH₈转变为C₂AS,并有CaCO₃生成,腐蚀层的致密程度增加,相同温度下水泥石的抗压强度随腐蚀时间增加而增大。

关键词: 铝酸钙水泥, 矿渣, 固井, CO₂腐蚀, 水化产物, 微观结构

Abstract: In view of the problems that CO₂ is easy to corrode Portland cement stone, damage the structural integrity of cement stone and induce interlayer sealing failure, this paper uses slag to modify calcium aluminate cement, and studies the change law of compressive strength of calcium aluminate cement-slag system at 60, 80, 100, 120 ℃ and pure CO₂ conditions. The effect of CO₂ corrosion on hydration products and microstructure of calcium aluminate cement-slag system were investigated by X-ray diffractometer, thermogravimetric analyzer and scanning electron microscopy. The results show that compared with pure calcium aluminate cement stone, the slag transforms the hydration product of calcium aluminate cement stone into C₂ASH₈, which greatly improves the early compressive strength of cement stone.When the mass ratio of calcium aluminate cement to slag is 5 ∶5, the compressive strength of calcium aluminate cement increases by 215.4% after curing at 60 ℃ for 14 d. After CO₂ corrosion, the hydration products of calcium aluminate cement-slag system change from C₂ASH₈ to C₂AS, and CaCO₃ is formed, which increases the density of corrosion layer. The compressive strength of cement stone increases with the increase of corrosion time at same temperature.

Key words: calcium aluminate cement, slag, cementing, CO₂ corrosion, hydration product, microstructure

中图分类号:

TQ172

师伟, 龚泽相, 刘开强, 马疆, 王军, 代红, 邓林. 铝酸钙水泥-矿渣体系的CO₂腐蚀行为及微观结构研究[J]. 硅酸盐通报, 2023, 42(10): 3695-3702.

SHI Wei, GONG Zexiang, LIU Kaiqiang, MA Jiang, WANG Jun, DAI Hong, DENG Lin. CO₂ Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3695-3702.

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铝酸钙水泥-矿渣体系的CO₂腐蚀行为及微观结构研究

CO₂ Corrosion Behavior and Microstructure of Calcium Aluminate Cement-Slag System

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