Adsorption and desorption behavior under coal–water–gas coupling conditions of high- and low-rank coal samples

doi:10.1007/s11707-022-0980-7

Front. Earth Sci.

2023, Vol. 17

Issue (1) : 145-157 https://doi.org/10.1007/s11707-022-0980-7

RESEARCH ARTICLE

Adsorption and desorption behavior under coal–water–gas coupling conditions of high- and low-rank coal samples

Chen GUO^1,^2,³, Jiang GOU¹, Dongmin MA^1,^2,³(

), Yuan BAO^1,^2,³, Qingmin SHI^1,^2,³, Jiahao MENG¹, Junzhe GAO¹, Lingling LU⁴

¹. College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
². Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi’an 710054, China
³. Geological Research Institute for Coal Green Mining, Xi’an University of Science and Technology, Xi’an 710054, China
⁴. Aerophoto Grammetry and Remote Sensing Bureau, China National Administration of Coal Geology, Xi’an 710100, China

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Abstract

High- and low-rank coalbed methane (CBM) are both important fields of CBM development in China, but their formation and production mechanisms differ considerably. The adsorption/desorption behavior of high- and low-rank coals under the coupling of coal–water–gas was investigated using two series of samples. Coal samples from Zhangjiamao (ZJM) coal mine, Ordos basin, and Sihe (SH) coal mine, Qinshui basin, were tested by isothermal adsorption–desorption experiment, natural imbibition experiment, nuclear magnetic resonance, mercury injection porosimetry, contact angle test, and permeability test. Isothermal adsorption and desorption experiments under dry, equilibrium water, and saturated water, were performed to explore the differences between the adsorption and desorption characteristics. The results show that the wettability and permeability of the ZJM low-rank coal sample was considerably higher than that of the SH high-rank coal sample. The imbibition process of the ZJM sample exhibited a high imbibition rate and high total-imbibition volume, whereas the SH sample exhibited a slow imbibition rate and low total-imbibition volume. The ZJM sample had a complex pore structure and diverse pore-size distribution with a lower mercury withdrawal efficiency at 59.60%, whereas the SH sample had a relatively uniform pore-size distribution with a higher mercury withdrawal efficiency at 97.62%. The response of adsorption and desorption of the ZJM sample to water was more significant than that of the SH sample. The desorption hysteresis of the ZJM sample was stronger than that of the SH sample and was more prominently affected by water, which was consistent with its strong wettability and complex pore-throat configuration. A comprehensive adsorption and desorption mode was constructed for high- and low-rank coal samples under coal–water–gas coupling condition. The research results are important to enrich the geological theory of high- and low-rank CBM and to guide efficient CBM recovery.

Keywords coalbed methane adsorption–desorption desorption hysteresis wettability pore structure coal–water–gas coupling

Corresponding Author(s): Dongmin MA

About author:

^* These authors contributed equally to this work.

Online First Date: 19 September 2022 Issue Date: 03 July 2023

Cite this article:

Chen GUO,Jiang GOU,Dongmin MA, et al. Adsorption and desorption behavior under coal–water–gas coupling conditions of high- and low-rank coal samples[J]. Front. Earth Sci., 2023, 17(1): 145-157.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-022-0980-7
https://academic.hep.com.cn/fesci/EN/Y2023/V17/I1/145

Fig.1 Diagram of experimental scheme.

Tab.1 Results of the maceral and proximate analysis

Tab.2 Results of the CA tests

Fig.2 Images of contact angle tests.

Tab.3 Sample parameters and data recording of NIE and saturation

Tab.4 Changes in porosity and saturation at different stages of NIE and saturation

Fig.3 NIE porosity and saturation evolution of coal samples.

Fig.4 NMR T₂ spectra of coal samples after NIE and saturation.

Fig.5 Evolution of imbibition pore types of coal samples.

Fig.6 Slip correction of coal sample permeability.

Tab.5 Pore structure parameters of coal samples obtained from MIP

Fig.7 Mercury intrusion and extrusion curves of coal samples.

Fig.8 MIP pore size distribution of coal samples.

Tab.6 Statistics of pore size distribution of coal samples

Tab.7 Water content of coal samples for IADE in different states

Fig.9 Isothermal adsorption and desorption curves of coal samples.

Fig.10 Comparison of wettability and variation of adsorption/desorption constants of three water-bearing states between ZJM and SH samples.

Tab.8 Calculation results of desorption hysteresis constant

Fig.11 Schematic for quantitative calculation of desorption hysteresis (Wang et al., 2016).

Tab.9 Calculation results of desorption hysteresis area coefficient HI

Fig.12 Three-phase coupled adsorption–desorption mode for low- and high-rank coals.

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