期刊
FUEL
卷 292, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120312
关键词
CO2 sequestration; Enhanced shale gas recovery; Zeolite; Water adsorption; CO2/CH4 selectivity
资金
- US National Science Foundation [DMS-1209124]
- Society of Petroleum Engineers Gulf Coast Section
- Sinopec Tech Houston LLC
- CNPC Chuanqing Drilling Engineering Company Limited
- Institute of Petroleum Exploration Development
- PetroChina Company Limited
Water can suppress the adsorption of CO2 and CH4 when its content is high, but can enhance CO2/CH4 selectivity under certain circumstances. Kerogen shows a stronger preference for CO2 adsorption over CH4.
We proposed to use zeolites as multi-functional proppants for enhanced shale gas recovery and CO2 sequestration in our previous paper and studied the competitive adsorption of CO2 and CH4 in silicalite-1 and kerogen organic matter. It is proved that CO2 released from proppants can be preferentially adsorbed by kerogen and replace the adsorbed CH4. In the present paper, we aim at studying the impact of water on the gas adsorption capacity and selectivity of CO2 over CH4 since water can significantly alter gas adsorption behaviors in zeolites and organic matter. We carry out grand canonical Monte Carlo simulations of water adsorption and the competitive adsorption of a CO2, CH4, and water mixture in silicalite-1 and in kerogen. It is found that water is less favored in both adsorbents but could suppress the adsorption of CO2 and CH4 when the water content is high, it can also enhance CO2/CH4 selectivity under some circumstances. Kerogen shows a stronger preference for adsorbing CO2 over CH4 under most conditions; thus, the replacement process of CO2 and CH4 with water present can still happen in the positive direction.
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