Research on high-pressure adsorption of supercritical CO2 and the characterization of coal structure change in anthracite

CO2-Enhanced Coal Bed Methane ( CO2-ECBM) Technology has been widely used in deep coalbed methane (DCBM) extraction and CO2 sequestration. CO2 is in the supercritical state ( ScC - O2 ) in deep coal seam reservoir, and has mechanical, physical and chemical effects on the coal body, making understand...

Full description

Saved in:
Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2024-05, Vol.1335 (1), p.012047
Main Authors: Niu, D, Liang, W G, Wang, J M, Chen, Y D, Yan, W L
Format: Article
Language:English
Subjects:
Adsorption
Anthracite
Carbon dioxide
Carbon dioxide fixation
Carbon sequestration
Chemical effects
Coal
Coalbed methane
Fracture permeability
High pressure
Methane
Microstructure
Mutation
Permeability
Porosity
Pressure effects
Resource exploitation
Structural analysis
Supercritical gas extraction
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:CO2-Enhanced Coal Bed Methane ( CO2-ECBM) Technology has been widely used in deep coalbed methane (DCBM) extraction and CO2 sequestration. CO2 is in the supercritical state ( ScC - O2 ) in deep coal seam reservoir, and has mechanical, physical and chemical effects on the coal body, making understanding ScCO2 adsorption crucial. Based on the self-developed supercritical isothermal adsorption device, ScCO2 high-pressure adsorption experiments were carried out in anthracite. Besides, using multiple characterisation methods to analyse the changes in microstructures of coal before and after ScCO2 adsorption and reveal the mechanism of processing. The results indicate that an obvious mutation zone in adsorption during high-pressure conditions is carried out, with the minimal adsorption capacity in the mutation zone; 2) The effect of ScCO2 on the microstructure of the coal mainly focuses on the micropores and mesopores (below 50 nm ), resulting in an improved coal adsorption capacity; 3)Providing three assessment indexes of potential of DCBM resource exploitation and CO2 sequestration includes the buried depth, porosity and fracture permeability. The above research outcomes provide important theoretical foundation for the development of DCBM resources, assessment of CO2 sequestration potential and engineering application.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/1335/1/012047