3D micro-structural changes of an artificial flow channel in wellbore cement under geologic CO2 storage conditions: Combined effect of effective stress and flow
文献类型：期刊论文
| 作者 | Gan, Manguang1,2; Zhang, Liwei1,2; Wang, Yan1; Mei, Kaiyuan1,2; Fu, Xiaojuan1; Cheng, Xiaowei3,4; Bai, Mingxing5,6; Liu, Hejuan1,2; Li, Xiaochun1,2
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| 刊名 | CONSTRUCTION AND BUILDING MATERIALS
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| 出版日期 | 2022-03-28 |
| 卷号 | 325期号:-页码:- |
| 关键词 | Geologic CO2 storage Cement integrity CT imaging Effective stress CO2 leakage |
| ISSN号 | 0950-0618 |
| 英文摘要 | Understanding CO2-induced micro-structural changes at the imperfections in wellbore cement is vital for assessing the risk of CO2 leakage through wellbore cement under geologic CO2 storage (GCS) conditions. To investigate the evolution of a flow channel width in cement under GCS conditions and the influence of effective stress and flow on the micro-structural changes of the flow channel in cement, we carried out a set of experiments in which the flow condition (flow-through v.s. static) and the effective stress (3 MPa effective stress v.s. no effective stress) were varied. Micro-structural changes of an artificial flow channel were investigated by X-ray micro-computed tomography (CT). CT images revealed a clear micro-structural change of the flow channel and distributions of Ca(OH)(2)/C-S-H dissolution and calcite precipitation zones near the channel after reacting with CO2-saturated brine. CT results showed that a flow rate of 0.01 mL/min through the channel turned channel self-sealing (as observed in the static scenario) into channel opening. Effective stress accelerated the dominant chemical reaction, i.e., enhancement of Ca(OH)(2)/C-S-H dissolution around the channel in a flow-through sce-nario and enhancement of calcite precipitation around the channel in a static scenario. It seems that effective stress and flow have a combined contribution to micro-structural change of the flow channel in hydrated Portland cement, which may increase the risk of CO2 leakage through wellbore cement when exposed to high concentration CO2. |
| 学科主题 | Construction & Building Technology ; Engineering ; Materials Science |
| 语种 | 英语 |
| WOS记录号 | WOS:000917952900001 |
| 出版者 | ELSEVIER SCI LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35512]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2.University of Chinese Academy of Sciences, Beijing 100049, China 3.School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan 610500, China 4.State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum Univfersity, 610500, China 5.Department of Petroleum Engineering, Northeast Petroleum University, 163318 Daqing, China 6.Department of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China |
| 推荐引用方式 GB/T 7714 | Gan, Manguang,Zhang, Liwei,Wang, Yan,et al. 3D micro-structural changes of an artificial flow channel in wellbore cement under geologic CO2 storage conditions: Combined effect of effective stress and flow[J]. CONSTRUCTION AND BUILDING MATERIALS,2022,325(-):-. |
| APA | Gan, Manguang.,Zhang, Liwei.,Wang, Yan.,Mei, Kaiyuan.,Fu, Xiaojuan.,...&Li, Xiaochun.(2022).3D micro-structural changes of an artificial flow channel in wellbore cement under geologic CO2 storage conditions: Combined effect of effective stress and flow.CONSTRUCTION AND BUILDING MATERIALS,325(-),-. |
| MLA | Gan, Manguang,et al."3D micro-structural changes of an artificial flow channel in wellbore cement under geologic CO2 storage conditions: Combined effect of effective stress and flow".CONSTRUCTION AND BUILDING MATERIALS 325.-(2022):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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