Evidence of self-sealing in wellbore cement under geologic CO2 storage conditions by micro-computed tomography (CT), scanning electron microscopy (SEM) and Raman observations

doi:10.1016/j.apgeochem.2021.104937

	Evidence of self-sealing in wellbore cement under geologic CO2 storage conditions by micro-computed tomography (CT), scanning electron microscopy (SEM) and Raman observations
	Wang, Yan 2,6; Liu, Sinan 2,3; Zhang, Liwei 2,3; Gan, Manguang 2,3; Miao, Xiuxiu 4; Wei, Ning 2,3; Cheng, Xiaowei 1,5; Liu, Hejuan 2,3; Li, Xiaochun 2,3; Li, Jun 7
刊名	APPLIED GEOCHEMISTRY
	2021-05-01
卷号	128 页码:10
关键词	Wellbore cement Self-sealing CO2 storage CT scanning Carbonation
ISSN号	0883-2927
DOI	10.1016/j.apgeochem.2021.104937
英文摘要	In this study, reaction experiments between CO2-saturated brine and wellbore cement samples cured under different pressures were conducted to study microstructural and mineral composition changes using microcomputed tomography (micro-CT), scanning electron microscopy (SEM) and Raman spectroscopy. The CT images of post-CO2 exposure cement samples showed a dissolution-precipitation-dissolution pattern at the exterior of the samples. The dissolution in the inner hole of the samples, however, was not significant. Instead, only CaCO3 precipitation was observed in the inner hole. CaCO3 precipitation in the inner hole contributes to selfsealing of the cement, which reduces the risk of CO2 leakage through wellbore cement. According to CT and SEM observations, a higher curing pressure caused more precipitation of CaCO3, which favored cement selfsealing when exposed to CO2. The appearance of a C-O peak and the disappearance of a -OH peak after reaction with CO2 were observed by Raman spectroscopy, which was attributed to cement carbonation that converted Ca(OH)(2) into CaCO3. This study provides solid evidence of cement self-sealing due to cement carbonation under geologic CO2 storage circumstances.
资助项目	National Natural Science Foundation of China[41902258] ; National Natural Science Foundation of China[U1967208] ; National Key R&D Program of China[2019YFE0100100]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000647771200003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27186]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Liwei; Li, Jun
作者单位	1.Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China 5.Southwest Petr Univ, Sch New Energy & Mat, Chengdu 610500, Sichuan, Peoples R China 6.China Univ Geosci, Inst Geophys & Geomat, Wuhan 430074, Peoples R China 7.China Univ Geosci, Sch Earth Resources, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yan,Liu, Sinan,Zhang, Liwei,et al. Evidence of self-sealing in wellbore cement under geologic CO2 storage conditions by micro-computed tomography (CT), scanning electron microscopy (SEM) and Raman observations[J]. APPLIED GEOCHEMISTRY,2021,128:10.
APA	Wang, Yan.,Liu, Sinan.,Zhang, Liwei.,Gan, Manguang.,Miao, Xiuxiu.,...&Li, Jun.(2021).Evidence of self-sealing in wellbore cement under geologic CO2 storage conditions by micro-computed tomography (CT), scanning electron microscopy (SEM) and Raman observations.APPLIED GEOCHEMISTRY,128,10.
MLA	Wang, Yan,et al."Evidence of self-sealing in wellbore cement under geologic CO2 storage conditions by micro-computed tomography (CT), scanning electron microscopy (SEM) and Raman observations".APPLIED GEOCHEMISTRY 128(2021):10.