Journal
ENERGY
Volume 206, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.118150
Keywords
Supercritical carbon dioxide; Shale; Methane adsorption behaviour; Adsorption models; Solubility
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Funding
- National Natural Science Foundation of China [U19B2009, 51774060]
- Innovation Team Program of Ministry of Education of China [IRT-13043]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-17R112]
- Basic Research and Frontier Exploration Projects in Chongqing [cstc2019jcyj-msxmX0053, cstc2019yszx-jcyjX0007]
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To investigate the effects of supercritical CO2 (SC-CO2) saturation pressures and temperatures on the methane adsorption capacity of shale, total organic carbon (TOC) analysis, X-ray diffraction (XRD) analysis, scanning electron microscope and energy dispersive spectrometer (SEM/EDS) analysis, low-pressure N-2 adsorption (LP-NA), and high-pressure methane adsorption (HP-MA) were conducted on raw and SC-CO2 -saturated (8, 12, 16 MPa; 40, 60, 80 degrees C) shale collected from the Sichuan Basin. Results indicate that the excess adsorption isotherm of shale to methane clearly exhibited excess adsorption characteristics with increasing adsorption pressures. This excess methane adsorption capacity decreased after SC-CO2 saturation and is mainly attributable to decreases in the TOC content, clay minerals and specific surface area (SSA) in the SC-CO2 -saturated shale. The density of adsorbed phase methane was considered at different adsorption models, and the results suggest that the Langmuir-Freundlich (LF) and Dubinin-Astakhov (DA) models better describe methane adsorption behaviours than the Langmuir and Ono-kondo models. The methane adsorption capacity of shale is closely related to the solubility of SC-CO2, which decreased significantly with increasing SC-CO2 saturation time and pressure, while the influence of SC-CO2 saturation temperatures was not evident at low-pressure (8 MPa). This study provides a theoretical reference for CO2 enhanced shale gas recovery. (C) 2020 Elsevier Ltd. All rights reserved.
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