Mechanism of gas bubble migration in meso fissure of coal water injection based on CT images

Zhang, Jiayong; He, Qingze; Chen, Jian; Guo, Yanlei; Guo, Liwen; Wang, Fusheng; Liu, Xiaoli

doi:10.1016/j.fuel.2023.130327

Fuel

2024

DOI: 10.1016/j.fuel.2023.130327

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Mechanism of gas bubble migration in meso fissure of coal water injection based on CT images

Jiayong Zhang,

Qingze He,

Jian Chen

et al.

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2024

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Cited by 3 publications

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In situ loading of a pore network model for quantitative characterization and visualization of gas seepage in coal rocks

Jiao,

Chen,

Zhang

et al. 2024

Deep Underground Science and Engineering

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The flow characteristics of coalbed methane (CBM) are influenced by the coal rock fracture network, which serves as the primary gas transport channel. This has a significant effect on the permeability performance of coal reservoirs. In any case, the traditional techniques of coal rock fracture observation are unable to precisely define the flow of CBM. In this study, coal samples were subjected to an in situ loading scanning test in order to create a pore network model (PNM) and determine the pore and fracture dynamic evolution law of the samples in the loading path. On this basis, the structural characteristic parameters of the samples were extracted from the PNM and the impact on the permeability performance of CBM was assessed. The findings demonstrate that the coal samples' internal porosity increases by 2.039% under uniaxial loading, the average throat pore radius increases by 205.5 to 36.1 μm, and the loading has an impact on the distribution and morphology of the pores in the coal rock. The PNM was loaded into the finite element program COMSOL for seepage modeling, and the M3 stage showed isolated pore connectivity to produce microscopic fissures, which could serve as seepage channels. In order to confirm the viability of the PNM and COMSOL docking technology, the streamline distribution law of pressure and velocity fields during the coal sample loading process was examined. The absolute permeability of the coal samples was also obtained in order for comparison with the measured results. The macroscopic CBM flow mechanism in complex low‐permeability coal rocks can be revealed through three‐dimensional reconstruction of the microscopic fracture structure and seepage simulation. This study lays the groundwork for the fine description and evaluation of coal reservoirs as well as the precise prediction of gas production in CBM wells.

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In situ loading of a pore network model for quantitative characterization and visualization of gas seepage in coal rocks

Jiao,

Chen,

Zhang

et al. 2024

Deep Underground Science and Engineering

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Evolution of the hydraulic wetting path in fractured coal under true triaxial stress and the influence mechanism of fracture orientation

Liu,

Jiang,

Wang

et al. 2024

Journal of Hydrology

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Wettability and physical modification of coal under vacuum saturation invasion of SiO2 nanofluids

Ni,

Gong,

et al. 2024

Physics of Fluids

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Coal seam water injection technology could improve the water content of coal seam, which is an effective technical measure to reduce dust generation in the mining process. Water-based silica nanofluids are a green wetting agent for coal seam water injection. To understand the wetting mode of nanofluids in coal, it is necessary to explore the physico-chemical properties of nanofluid-modified coals. First, a new idea of saturation and intrusion of nanofluid into coal was proposed by using vacuum pressurized saturation device. Then, the physical and chemical properties of the modified coal were studied by Fourier transform infrared spectrometer, low-temperature liquid nitrogen adsorption experiments, and uniaxial compression mechanics experiments. The results showed that the content of oxygen-containing functional groups in the modified coal increased, which was positively correlated with the concentration of nanofluids. The pore structure of the modified coal sample changed from complex to simple, and the nanoparticles blocked the micropores to make the coal surface smooth. The saturation invasion of SiO2 nanofluids changed the mechanical properties of coal samples, and the compressive resistance of coal was weakened, and the minimum strength of the coal invaded by 1.5 wt. % SiO2 nanofluid saturation was 13.68 MPa. The saturation intrusion of SiO2 nanofluids has a negative effect on the surface adsorption of coal samples and the blockage of microporous structures, and makes the coal seam easier to be wetted, which contributes to the application and development of nanofluids in the field of coal seam water injection.

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Mechanism of gas bubble migration in meso fissure of coal water injection based on CT images

Cited by 3 publications

References 30 publications

In situ loading of a pore network model for quantitative characterization and visualization of gas seepage in coal rocks

In situ loading of a pore network model for quantitative characterization and visualization of gas seepage in coal rocks

Evolution of the hydraulic wetting path in fractured coal under true triaxial stress and the influence mechanism of fracture orientation

Wettability and physical modification of coal under vacuum saturation invasion of SiO2 nanofluids

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