Numerical Simulation Study on Optimal CO2 Injection Well Placement for Sequestration in Old Gob: A Case Study of the Huainan Mining Area

被引:0
|
作者
Chen, Yongchun [1 ,2 ]
Xu, Yanfei [1 ,2 ]
Tian, Yuchen [3 ,4 ,5 ]
Zhang, Helong [3 ,4 ,5 ]
Xue, Bo [1 ,2 ]
Chen, Shiheng [3 ,4 ,5 ]
Liu, Yinghai [3 ,4 ,5 ]
Liu, Yanzhi [3 ,4 ,5 ]
Liu, Shiqi [3 ,4 ]
Sang, Shuxun [3 ,4 ,5 ]
Zheng, Sijian [3 ,4 ]
机构
[1] Natl Engn Lab Protect Coal Mine Ecoenvironm, Huainan 232001, Peoples R China
[2] Natl Key Lab Deep Coal Safety Min & Environm Prote, Huainan 232001, Peoples R China
[3] China Univ Min & Technol, Jiangsu Key Lab Coal Based Greenhouse Gas Control, Xuzhou 221108, Peoples R China
[4] China Univ Min & Technol, Carbon Neutral Inst, Xuzhou 221008, Peoples R China
[5] China Univ Min & Technol, Sch Resources & Geosci, Xuzhou 221116, Peoples R China
基金
中国国家自然科学基金;
关键词
geological CO2 sequestration; old gob; COMSOL numerical simulations; CO2 storage capacity; well placement strategies; heterogeneity; NUCLEAR-MAGNETIC-RESONANCE; COALS;
D O I
10.3390/pr12102167
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The old gob, as a potential CO2 geological storage reservoir, has huge storage potential. To clarify the distribution characteristics and storage capacity of CO2 in the old gob after different well deployment schemes, this study, based on the actual geological conditions of the old gob in the Huainan mining area, uses the COMSOL software to numerically simulate CO2 injection into the old gob, considering the heterogeneity of permeability and the difference in coal-rock adsorption capacity within the old gob. The research indicates that the distribution characteristics of CO2 are significantly influenced by the deployment scheme. Specifically, different deployment schemes result in varying CO2 concentrations and distribution patterns. Particularly, when the injection well is deployed at a depth of 65 m, the distribution of CO2 in the low-permeability upper part of the old gob will significantly increase and the horizontal distribution range will significantly decrease. Under different well deployment modes, the CO2 storage capacity varies significantly. When the injection well is deployed at a depth of 65 m, it is more conducive to the storage of CO2 than at other deeper depths and the total storage capacity is larger. In addition, increasing the number of monitoring wells helps the migration and diffusion of CO2 in the old gob. Reasonably increasing the number of monitoring wells and adopting a symmetric deployment mode can significantly improve the CO2 storage capacity in the old gob. Through a reasonable deployment scheme, the CO2 storage capacity in the old gob can be more than 1.8 times that of the single monitoring well deployment scheme. Overall, based on the analysis of the distribution characteristics and storage capacity, the vertical positioning of the injection wells and the deployment mode of the monitoring wells that are conducive to improving the CO2 storage capacity in the old gob are obtained, which can provide an important reference for the well deployment scheme of CO2 storage in the old gob.
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页数:16
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