A novel index to evaluate CO2-induced wellbore cement degradation in CO2 rich environment

doi:10.1088/1755-1315/570/6/062017

	A novel index to evaluate CO2-induced wellbore cement degradation in CO2 rich environment
	Zhang,L W 4,5; Miao,X X 3; Wang,Y 5; Cheng,X W 2; Ellett,K 1; Gan,M G 4,5; Fu,X J 5; Liu,S N 4,5; Li,X C 4,5
刊名	IOP Conference Series: Earth and Environmental Science
	2020-10-01
卷号	570 期号:6
ISSN号	1755-1307
DOI	10.1088/1755-1315/570/6/062017
英文摘要	Abstract A new index named CT-derived carbonation index is proposed to evaluate CO2-induced cement degradation in CO2-rich corrosive environment. This index is obtained by conducting CT scanning of cement samples before and after exposure to CO2, calculating grayscale difference and applying an algorithm to correlate grayscale with CaCO3 content. To demonstrate how to calculate the carbonation index, a CO2-cement interaction experiment along with X-ray computed micro-tomography characterization of a cement sample before and after exposure to CO2 was carried out to investigate the degree of cement carbonation. CO2 was dissolved in 1 wt% NaCl solution under a CO2 partial pressure of 17 MPa and a temperature of 63 °C. The carbonate shell in the cement sample was segmented from the grayscale difference images and the average penetration depth of the carbonate shell was obtained. The carbonation index was then calculated as the ratio of the average penetration depth of the carbonate shell to the radius of the sample, divided by the reaction time. In this study, the carbonation index of the cement sample exposed to CO2 for 14 days was 0.01 day?1. Based on the results in this study and other studies, a carbonation index of 0.05 day?1 or above corresponds to heavy degradation of cement by CO2.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:1755-1307-570-6-062017
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/15638]
专题	中科院武汉岩土力学所
作者单位	1.Indiana Geological and Water Survey, Indiana University, Bloomington 47405-2208, USA 2.School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China 3.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China 4.University of Chinese Academy of Sciences, Beijing 100049, China 5.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
推荐引用方式 GB/T 7714	Zhang,L W,Miao,X X,Wang,Y,et al. A novel index to evaluate CO2-induced wellbore cement degradation in CO2 rich environment[J]. IOP Conference Series: Earth and Environmental Science,2020,570(6).
APA	Zhang,L W.,Miao,X X.,Wang,Y.,Cheng,X W.,Ellett,K.,...&Li,X C.(2020).A novel index to evaluate CO2-induced wellbore cement degradation in CO2 rich environment.IOP Conference Series: Earth and Environmental Science,570(6).
MLA	Zhang,L W,et al."A novel index to evaluate CO2-induced wellbore cement degradation in CO2 rich environment".IOP Conference Series: Earth and Environmental Science 570.6(2020).