Coupling between Damage Evolution and Permeability Model with the Adsorption Effect for Coal under Gas Extraction and Coal Mining Conditions

Fu, Jiyang; Li, Bobo; Ren, Cheng; Li, Jianhua; Wang, Zhonghui; Wu, Xuehai; Jia, Lidan

doi:10.1021/acs.energyfuels.2c01758

Cited by 10 publications

(2 citation statements)

References 75 publications

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“…As one of the key parameters in the process of gas migration, the coal seam permeability has a direct impact on the effect of gas extraction (Jing et al, 2020;Fu et al, 2022;Vasilenko et al, 2022). Figure 6 shows the gas pressure curves at 50, 100, 200, and 365 days of gas extraction at the working face when the coal seam permeability is increased by different multiples.…”

Section: Effect Of Permeability On Gas Extractionmentioning

confidence: 99%

Study on the influence of the tectonic evolution of Shuangyashan Basin on gas occurrence and extraction in mines

Lan

Zhang

et al. 2023

Front. Earth Sci.

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The formation and later evolution of coal-bearing basins in eastern Heilongjiang are controlled by multi-phase tectonic movements, and the Shuangyashan Basin is tectonically located at the southern end of the Sanjiang Basin in the northeast. The paper focuses on the regional geological and tectonic evolution of the Shuangyashan Basin and its influence on the gas occurrence law and extraction difficulty of the Jixian Coal Mine. The study determined that the gas occurrence of the mine in the Suibin-Jixian depression basin has regional aggregation and caprock sealing characteristics. The gas pressure and content of the 9# Coal Seam were measured in the underground test, and the results showed that the 9# coal seam is a hard-to-extract coal seam with low permeability. Aiming at the issue of hard-to-extract gas in 904 Working Face of 9# Coal Seam which is affected by depression basin and derived secondary tectonic conditions, numerical calculation and analysis of gas extraction effect of working face with different extraction parameters were carried out by COMSOL software, the results showed that: negative extraction pressure has less influence on gas extraction effect under basin conditions; when 113 mm diameter borehole is used for gas extraction, gas pressure decreases to 0.72 MPa; when the spacing of extraction borehole is 2 m, the gas pressure is reduced by 20%; when the coal seam permeability is increased by 10 times to more than 0.015 mD, the gas pressure is reduced by more than 50%. The optimized gas extraction scheme with 113 m diameter, 2 m borehole spacing, and 15 kPa negative pressure was proposed for the test working face, and combined with supercritical CO2 fracturing and permeability enhancement technology. Under underground measurement, the coal seam gas content was reduced by 39.7% compared to the original gas extraction scheme. It can be seen that the reasonable gas extraction scheme and coal seam pressure relief and permeability enhancement technology can significantly improve the gas extraction rate, and the extraction effect is remarkable.

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Section: Effect Of Permeability On Gas Extractionmentioning

confidence: 99%

Study on the influence of the tectonic evolution of Shuangyashan Basin on gas occurrence and extraction in mines

Lan

Zhang

et al. 2023

Front. Earth Sci.

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“…Li 24 proposed a coal permeability model that incorporated stress-induced anisotropy. Fu 25 developed a coal permeability model that incorporated damage evolution. Zhu 16 constructed a permeability model for rocks with filled fractures during the elastic stage.…”

Section: Introductionmentioning

confidence: 99%

Permeability of Argillaceous Sandstone Modeled with Tortuous Capillary Tubes Using Fractal Geometry

Liu,

Xu,

Xiao

et al. 2023

Energy Fuels

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Quantitative characterization of rock permeability is important for enhancing the extraction efficiency of oil and gas resources and maintaining the long-term stability of deep underground engineering. Fractal theory can quantitatively describe the pore size distribution and tortuosity of the seepage channel. Therefore, a permeability model was proposed based on fractal theory and the capillary tube model. This permeability model considered the tortuosity of the seepage channel and the damage evolution within the rock. Permeability data for argillaceous sandstone at different temperatures, pore pressures, and confining pressures were used to validate the permeability model. The permeability model simultaneously captured the permeability decrease owing to the compaction effect of stress and permeability recovery owing to the damage effect of stress, verifying the accuracy and rationality of the permeability model. Permeability influence factors K f (damage effect) and K c (compaction effect) under different temperatures, pore pressures, and confining pressure conditions were examined. The confining pressure and temperature increased K c and decreased K f, respectively, suggesting that the permeability of the rock decreases and recovers more significantly at low confining pressures and temperatures. The effect of pore pressure on the permeability influence factor may depend on the failure pattern of the rock, which changes with the confining pressure. The permeability and permeability influence factors exhibited crossover, which is attributed to macro-fracture formation within the rock. The compaction and damage effects of stress changed with the temperature, pore pressure, and confining pressure, consequently resulting in changes in the evolution process of permeability. This study provides a theoretical reference for exploiting tight sandstone reservoirs.

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Energy-Driven Damage Constitutive Model of Water-Bearing Coal Under Triaxial Compression

Wang,

Li,

Ren

et al. 2023

Rock Mech Rock Eng

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Coupling between Damage Evolution and Permeability Model with the Adsorption Effect for Coal under Gas Extraction and Coal Mining Conditions

Cited by 10 publications

References 75 publications

Study on the influence of the tectonic evolution of Shuangyashan Basin on gas occurrence and extraction in mines

Study on the influence of the tectonic evolution of Shuangyashan Basin on gas occurrence and extraction in mines

Permeability of Argillaceous Sandstone Modeled with Tortuous Capillary Tubes Using Fractal Geometry

Energy-Driven Damage Constitutive Model of Water-Bearing Coal Under Triaxial Compression

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