Desorption hysteresis of coalbed methane and its controlling factors: a brief review

Xu, Weikai; Li, Junhui; Wu, Xiang; Liu, Du; Wang, Zhuangsen

doi:10.1007/s11707-021-0910-0

Cited by 13 publications

(14 citation statements)

References 66 publications

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“…Generally speaking, V L reflects the ultimate adsorption capacity of coal reservoirs, while P L represents the difficulty level of gas desorption. Smaller P L , greater V L , and higher curvature of the adsorption isotherm mean stronger gas adsorption capacity (Wang et al, 2014;Xu et al, 2021). According to Eq.…”

Section: Resultsmentioning

confidence: 99%

“…The IHI value follows the same relative error change trend as the Langmuir volume V L , which is calculated using adsorption and desorption data. As a result, increasing moisture reduces total adsorption capacity first, while moisture in the coal also hinders methane molecule desorption, resulting in a higher IHI (Wang et al, 2014;Hou et al, 2020;Xu et al, 2021).…”

Section: Adsorption and Desorption Hysteresis Evaluation Modelmentioning

confidence: 99%

“…Based on the results of previous studies, desorption hysteresis is controlled by various factors with one or more dominant factors for any given coals (Zhang and Liu, 2017;Hou et al, 2020). The physical composition of the coal rock, thermal maturity, pore structure distribution, reservoir temperature, water content, and other factors all have an impact on the desorption hysteresis effect (Wang et al, 2014;Hou et al, 2020;Xu et al, 2021). Methane adsorption/desorption processes in TDCs are not consistent with OSC.…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies have shown that the adsorption and desorption of CBM in coal are not fully reversible in most cases, and there is a hysteresis (lag) in adsorption and desorption (Wang et al, 2014;Ma et al, 2020). In the CBM desorption process, desorption hysteresis is defined as a phenomenon in which the desorption process lags behind the adsorption process due to physicochemical effects like temperature, pressure, moisture, and pore capillary condensation phenomena (Wang et al, 2014;Lin et al, 2016;Xu et al, 2021). Based on the results of previous studies, desorption hysteresis is controlled by various factors with one or more dominant factors for any given coals (Zhang and Liu, 2017;Hou et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…The desorption hysteresis mechanisms proposed in the literature include the following: gas adsorbed into the coal matrix or dissolved into the residual moisture (Busch et al, 2003;, irreversible deformation (swelling/ shrinkage) (Wang et al, 2020b;He et al, 2020), or thermodynamic (energy barrier) limits on accessibility to pore throats (Ma et al, 2012;Liu et al, 2021). The explanations for the hysteresis mechanism are all directly or indirectly related to the pore structure distribution (Wang et al, 2014;Xu et al, 2021). The key pore scales influencing the generation of hysteresis in gas desorption from coal, on the other hand, are still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

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The Influence Mechanism of Pore Structure of Tectonically Deformed Coal on the Adsorption and Desorption Hysteresis

Ren

Weng

et al. 2022

Front. Earth Sci.

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Pore is the main adsorption and desorption space of coalbed methane (CBM). Pore size configuration and connectivity affect the adsorption/desorption hysteresis effect. Using tectonically deformed coal (TDC) and original structure coal of medium- and high-rank coal as the research objects, through the N2/CO2 adsorption experiment to analyze the pore size distribution and connectivity of different scales. We investigate the control mechanism of heterogeneous evolution in the key pore scales against adsorption/desorption hysteresis characteristics during coal metamorphism and deformation by combining the CH4 isothermal adsorption/desorption experiment under 30°C equilibrium moisture. The findings indicate that the super micropores (<2 nm) are mainly combination ink bottle-shaped pores and have worse connectivity as the degree of metamorphism and deformation increases. The super micropores occupy the vast majority of pore volume and specific surface area; its pore size distribution curve change presents an “M” bimodal type and is mainly concentrated in two pore segments of 0.45–0.70 nm and 0.70–0.90 nm. The effect of ductile deformation exerts a significantly greater effect on super micropores than brittle deformation. The exhibited adsorption–desorption characteristics are the result of the combined effect of the unique pore structure of the TDCs and different moisture contents. The presence of a large number of super micropores is the most important factor influencing the degree of gas desorption hysteresis. The “ink-bottle effect” is the primary cause of gas desorption hysteresis. For CBM development, some novel methods to increase desorption and diffusion rate at the super micropores scale should be considered.

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Section: Resultsmentioning

confidence: 99%

Section: Adsorption and Desorption Hysteresis Evaluation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Influence Mechanism of Pore Structure of Tectonically Deformed Coal on the Adsorption and Desorption Hysteresis

Ren

Weng

et al. 2022

Front. Earth Sci.

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Evaluation and analysis of methane adsorption capacity in deep‐buried coal seams

et al. 2022

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In this work, the high‐pressure methane adsorption/desorption tests were conducted in four coal samples (from low‐rank bituminous coal to anthracite) under different temperature and pressure conditions to reveal the mechanism of desorption hysteresis effect in the deep‐buried coal seams. The experimental and fitting results show that the presence of free methane molecules in the adsorption phase results in an obvious difference between the measured methane adsorption amount with the actual adsorption capacity. The Langmuir, Langmuir–Freundlich (L–F) and Dubinin–Astakhov (D–A) models have their own advantages and disadvantages in fitting the experimental adsorption/desorption data. As residual adsorption capacity C fitted by the D–A model would be negative at high temperatures and lose the meaning of the constant, the Langmuir model is more suitable to describe methane desorption process. The residual adsorption capacity fitted by Langmuir model tended to decrease as the temperature increased until it is almost completely desorbed at 373 K. Meanwhile, because the adsorption sites with lower energy are gradually occupied by methane molecules in the high‐pressure stage, intermolecular forces increased and methane molecules are more easily desorbed. Therefore, the desorption hysteresis coefficient trends to increase exponentially with the decrease of pressure and temperature, which indicated that the original gas content of the coal seams may decrease with the increase of the burial depth, but the risk of coal and gas outburst accidents may increase. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Coalbed methane desorption characteristics controlled by coalification and its implication on gas co-production from multiple coal seams

et al. 2022

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Desorption hysteresis of coalbed methane and its controlling factors: a brief review

Cited by 13 publications

References 66 publications

The Influence Mechanism of Pore Structure of Tectonically Deformed Coal on the Adsorption and Desorption Hysteresis

The Influence Mechanism of Pore Structure of Tectonically Deformed Coal on the Adsorption and Desorption Hysteresis

Evaluation and analysis of methane adsorption capacity in deep‐buried coal seams

Coalbed methane desorption characteristics controlled by coalification and its implication on gas co-production from multiple coal seams

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