| CCUS环境下水泥单矿C3S的CO2腐蚀动力学研究 |
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| 引用本文： | 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. |
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| 作者姓名： | 高强 梅开元 王德坤 张力为 张春梅 程小伟 |
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| 作者单位： | 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 |
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| 基金项目： | 四川省区域创新合作项目(2021YFQ0045) |
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| 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。
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| 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 |
| 收稿时间： | 2022-04-11 |
CO2 Corrosion Kinetics of C3S in Cement Single Ore under CCUS Environment |
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| 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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| Authors: | GAO Qiang MEI Kaiyuan WANG Dekun ZHANG Liwei ZHANG Chunmei CHENG Xiaowei |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | cement single ore C3S CO2 corrosion CCUS corrosion kinetics model penetration theory phase change |
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