CCUS环境下水泥单矿C3S的CO2腐蚀动力学研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2644-2653.

CCUS环境下水泥单矿C₃S的CO₂腐蚀动力学研究

高强¹, 梅开元^1,2, 王德坤³, 张力为², 张春梅¹, 程小伟¹

1.西南石油大学新能源与材料学院,成都 610500;
2.中国科学院岩土力学研究所岩土力学与岩土工程技术国家重点实验室,武汉 430071;
3.中国石油川庆钻探工程有限公司井下作业公司固井公司,成都 610000

收稿日期:2022-04-11 修回日期:2022-06-01 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 程小伟,教授。E-mail:chengxw@swpu.edu.cn
作者简介:高强(1996—),男,硕士研究生。主要从事油气井固井材料及外加剂方面的研究。E-mail:2598790194@qq.com
基金资助:
四川省区域创新合作项目(2021YFQ0045)

CO₂ Corrosion Kinetics of C₃S in Cement Single Ore under CCUS Environment

GAO Qiang¹, MEI Kaiyuan^1,2, WANG Dekun³, ZHANG Liwei², ZHANG Chunmei¹, CHENG Xiaowei¹

1. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China;
2. State Key Laboratory of Geo-mechanics and Geo-technical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
3. Cementing Company of CCDC Downhole Operation Company, Chengdu 610000, China

Received:2022-04-11 Revised:2022-06-01 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 在碳捕集、利用和封存(CCUS)井下,油井水泥因长期受井下高温、高压和高酸性流体的作用会遭受碳化腐蚀导致水泥环失效。为了模拟CO₂地质封存井下碳化腐蚀环境,本文将油井水泥的主要单相矿物硅酸三钙(C₃S)置于不同温度(30 ℃、60 ℃、90 ℃),并密封在8.0 MPa的气相或液相的CO₂碳化环境下,采用XRD和TGA相结合的分析方法,分析水泥单矿C₃S受CO₂腐蚀环境的影响规律。根据非稳态Fick扩散的渗透理论模型,建立腐蚀产物定量分析结果与腐蚀龄期的数学模型,拟合得到C₃S受CO₂腐蚀后的产物生成系数,以此评价不同CO₂腐蚀因素对C₃S的影响程度。结果表明:在CO₂气相环境中,温度升高将显著加剧对C₃S的腐蚀且产生溶蚀现象;而在CO₂液相环境下,高温(90 ℃)使C₃S水化反应加剧并形成阻滞层,降低CO₂对C₃S的腐蚀速率。

关键词: 水泥单矿C₃S, CO₂腐蚀, CCUS, 腐蚀动力学模型, 渗透理论, 物相变化

Abstract: Under thecarbon capture, utilization and storage (CCUS) well, the oil well cement will be carbonized and corroded due to the long-term action of downhole high temperature, high pressure and highly acidic fluid, resulting in the failure of the cement sheath. In order to simulate the carbonation and corrosion environment of CO₂ geological storage well, the main single ore mineral calcium silicate (C₃S) of oil well cement was placed under different temperatures (30 ℃, 60 ℃, 90 ℃) and sealed 8.0 MPa gas or liquid phase CO₂ carbonization environment. XRD and TGA were used to analyze the influence of C₃S in cement single ore by CO₂ corrosive environment. According to the infiltration theoretical model of unsteady Fick diffusion, a mathematical model of the quantitative analysis results of corrosion products and corrosion age was established, and the product formation coefficient of C₃S after being corroded by CO₂ was obtained by fitting, so as to evaluate the influences of different CO₂ corrosion factors on C₃S. The results show that the increase of temperature significantly aggravates the corrosion of C₃S and leads to the dissolution phenomenonin the gas phase environment of CO₂. While in the liquid phase environment of CO₂, the high temperature (90 ℃) makes the C₃S hydration reaction intensify, forming a retardation layer and slowing down the CO₂ corrosion rate to C₃S.

Key words: cement single ore C₃S, CO₂ corrosion, CCUS, corrosion kinetics model, penetration theory, phase change

中图分类号:

TE256

高强, 梅开元, 王德坤, 张力为, 张春梅, 程小伟. CCUS环境下水泥单矿C₃S的CO₂腐蚀动力学研究[J]. 硅酸盐通报, 2022, 41(8): 2644-2653.

GAO Qiang, MEI Kaiyuan, WANG Dekun, ZHANG Liwei, ZHANG Chunmei, CHENG Xiaowei. CO₂ Corrosion Kinetics of C₃S in Cement Single Ore under CCUS Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2644-2653.

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CCUS环境下水泥单矿C₃S的CO₂腐蚀动力学研究

CO₂ Corrosion Kinetics of C₃S in Cement Single Ore under CCUS Environment

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