Interactions of dynamic supercritical CO_(2) fluid with different rank moisture-equilibrated coals: Implications for CO_(2) sequestration in coal seams

作     者：Zichao Hu Chao Li Dengfeng Zhang Zichao Hu;Chao Li;Dengfeng Zhang

作者机构：Faculty of Chemical EngineeringKunming University of Science and TechnologyState Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective DevelopmentBeijing 100083China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2021年第34卷第7期

页      面：288-301页

核心收录：

学科分类：0710[理学-生物学] 0820[工学-石油与天然气工程] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 0703[理学-化学] 082002[工学-油气田开发工程] 

基　　金：sponsored by the National Natural Science Foundation of China(41762013) the Open Foundation of Key Laboratory of Shale Oil and Gas Exploration&Production,SINOPEC(G5800-19-ZS-KFZY001) the National Major Project during the 13th Five-Year Plan Period(2016ZX05061) 

主　　题：Coal Sequestration Moisture Supercritical carbon dioxide Methane 

摘      要：The interactions between CO_(2) and coals during CO_(2)-ECBM(CO_(2) sequestration in deep coal seams with enhanced coal-bed methane recovery)could change pore morphology and chemistry property of coals,thereby affecting adsorption,diffusion and flow capability of CO_(2) and CH_(4) within coal *** simulate CO_(2)-ECBM process more practically,the dynamic interactions of supercritical CO_(2)(sc CO_(2))and moisture-equilibrated coals were performed at temperature of 318.15 K,pressure of 12.00 MPa,and duration of 12.00 *** impacts of the interactions on physicochemical properties of coals were *** indicate that sc CO_(2)/H_(2)O exposure shows minor effect on micropores of ***,the exposure significantly decreases the mesopore surface area of bituminous coals,while increases that of *** mesopore volume and the average mesopore diameter of all the coals after sc CO_(2)/H_(2)O exposure *** multi-fractal analysis verifies that the sc CO_(2) exposure can enhance the pore connectivity of various rank *** from the pore morphology,the exposure of sc CO_(2)/H_(2)O also affects the oxygenic functional groups on coal ***,the exposure of sc CO_(2)/H_(2)O reduces the content of CAO and C@O of *** content of COOH of low rank coals including Hehua-M2#coal,Zhongqiang-4#coal,Buliangou-9#coal and Tashan-5#coal decreases,while the high rank Laochang^(-1)1#coal and Kaiyuan-9#coal witness a growth in *** content of total oxygenic functional groups of all coals after interaction with sc CO_(2)/H_(2)O decreases;on the contrary,that of CAC/CAH of all coals after sc CO_(2)/H_(2)O exposure *** summary,the interaction with sc CO_(2)/H_(2)O significantly changes the pore system and oxygenic functional groups of various rank coals,which needs further attention regarding CO_(2)-ECBM.