Effects of Acidification on the Wettability Modification of Coal and Adsorption Characteristics of Coalbed Methane

Zhang, Rui; Yuan, Ming; Li, Bobo; Li, Zhaoping; Lv, Qing; Xu, Shiqing

doi:10.1007/s11053-022-10141-9

Cited by 10 publications

(12 citation statements)

References 49 publications

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“…An analysis of Figure shows that certain oxygen-containing functional groups were newly generated in the macromolecular structural model of the acidified coal samples. These functional groups are hydrophilic and easily react with water molecules to form hydrogen bonds, thereby adsorbing many water molecules. , Zhang et al found that the adsorption capacity of coal showed a negative correlation with its wettability in the adsorption of CH 4 . The adsorption of CH 4 by coal decreases as the wettability of the coal increases.…”

Section: Results and Discussionmentioning

confidence: 99%

“…These functional groups are hydrophilic and easily react with water molecules to form hydrogen bonds, thereby adsorbing many water molecules. 44,45 Zhang et al 46 found that the adsorption capacity of coal showed a negative correlation with its wettability in the adsorption of CH 4 . The adsorption of CH 4 by coal decreases as the wettability of the coal increases.…”

Section: Water Molecule Adsorption Simulationmentioning

confidence: 99%

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Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

He,

Yuan,

et al. 2024

Ind. Eng. Chem. Res.

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We explored the influence of acidification on the structure, wettability, and adsorption capacity of coal based on Xray diffraction, water adsorption tests, elemental analysis, 13 C nuclear magnetic resonance spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, isothermal adsorption tests, and molecular simulations. The results indicated that the silicate content in the experimental coal samples was high and the optimal acidification condition for improving wettability was 4% hydrofluoric acid with a 6 h reaction time. Under acidification, the aromatic structure in coal changed slightly, while the aliphatic structure and functional groups were significantly altered. In addition, the aliphatic chains were broken to form shorter chains, and the carbon structures changed from methylene and hypomethylene to methyl. Moreover, acidification removed nitrogen atoms and generated a greater number and variety of oxygen-containing groups. The macromolecular structural models of the coal samples and the acidified samples were constructed according to the above tests, and adsorption simulations were subsequently performed by using the models. In the CH 4 adsorption simulation, the adsorption capacity decreased after acidification, and the changing trend was highly consistent with the isothermal adsorption tests. In the simulation of the adsorption of H 2 O molecules and gas−water binary components, the macromolecular model of acidified coal exhibited better performance in absorbing H 2 O, and the improved wettability further inhibited its adsorption capacity for CH 4 . Our findings are crucial for exploring the mechanisms underlying the acid modification of wettability and adsorption capacity of coal at the microscopic level.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Water Molecule Adsorption Simulationmentioning

confidence: 99%

Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

He,

Yuan,

et al. 2024

Ind. Eng. Chem. Res.

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“…Li et al 149 found that activated water could invade the pore structure of coal samples under high-pressure conditions and block the pore structure of the coal seam, ultimately reducing the production of coal seam gas and CO 2 storage. Zhang et al 150 studied the effect of acid solution on the adsorption characteristics of coal seams and found that acidification technology improved the permeability of low-permeability coal seams and changed the wettability of coal. The adsorption capacity of the coal samples was negatively correlated with wettability.…”

Section: Recent Research Hotspotsmentioning

confidence: 99%

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Feng

et al. 2023

Energy Fuels

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A significant amount of carbon dioxide (CO2) is being released into the atmosphere as a result of the acceleration of industrialization and increased energy consumption, which are causing a rise in world temperatures. Despite the fact that nations all over the world have actively participated in CO2 storage projects, there is still not enough to moderate global temperatures. Therefore, there is an urgent need for the development of CO2 sequestration technologies. The main geological storage trapping mechanisms are discussed in this work along with an analysis of the major influencing variables. Additionally, the benefits and drawbacks of significant storage locations and current research hotspots are explored. Storage project development across the globe is outlined. The use of machine learning for CO2 sequestration is reviewed toward the end. This extensive review reveals that the main variables affecting CO2 capture capacity are hydrodynamic and geochemical. The sequestration capability of various storage sites is significantly influenced by the reservoir characteristics and implementation methodologies. The successful implementation of the storage project is determined by local policies and public support. The development of machine learning technologies makes storage projects safer and more dependable.

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“…The third type is to modify coal seams with some chemical reagents to increase the water absorption capacity of the coal seams. Zhang et al modified coal samples with 6% hydrofluoric acids for 12 h and revealed that the coal-water contact angle reduces by 20.7% and the wettability of coal is improved significantly. Xie et al studied influences of HCL, HF, and SDS compound liquids on wettability of coal.…”

Section: Introductionmentioning

confidence: 99%

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

Zhao,

Tian,

Xie

et al. 2023

Ind. Eng. Chem. Res.

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It has been proven that SiO2–H2O nanofluids have great application potential for water injection in coal seams. To explore the influences of the particle size on the stability and wettability of SiO2–H2O nanofluids, sedimentation observation of nanoparticles (NPs), viscosity tests, pH tests, surface tension tests, and contact angle tests were performed for SiO2–H2O nanofluids with different particle sizes. The research shows that the larger the particle size of SiO2 NPs, the more obvious the aggregation and sedimentation of NPs. The smaller the particle size of SiO2 NPs is, the lower the surface tension and contact angle of the SiO2–H2O nanofluids. As time goes on, SiO2–H2O nanofluids successively show time-varying characteristics in the low stability stage, moderate stability stage, and high stability stage. Therein, the low stability stage is the optimal period for enhancing the water injection in coal seams by nanofluids. The research provides theoretical support for using SiO2–H2O nanofluids to enhance water injection in coal seams.

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Effects of Acidification on the Wettability Modification of Coal and Adsorption Characteristics of Coalbed Methane

Cited by 10 publications

References 49 publications

Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes

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Effects of Acidification on the Wettability Modification of Coal and Adsorption Characteristics of Coalbed Methane

Cited by 10 publications

References 49 publications

Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

Construction of Macromolecular Structural Models of Coal and Simulation of Adsorption under Acidification

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Study of Time-Varying Laws of Stability and Wettability of SiO2–H2O Nanofluids with Different Particle Sizes

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Product

Resources

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Study of Time-Varying Laws of Stability and Wettability of SiO₂–H₂O Nanofluids with Different Particle Sizes