Experimental research on the permeability of high-rank coal under a varying stress and its influencing factors

Meng, Zhaoping; Li, Guoqing

doi:10.1016/j.enggeo.2013.04.013

Cited by 115 publications

(62 citation statements)

References 27 publications

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“…And a variety of factors controlling coal reservoir conditions during permeability simulation have been supposed, including the uniaxial strain (Shi and Durucan, 2005a;Liu et al, 2012), constant volume (Massarotto et al, 2009), and constant confining stress (Liu and Rutqvist, 2010). On the basis of previous research results, Meng and Li (2013) conducted the N 2 permeability experiments and reported that the permeability increases with the increase of vitrinite content as well as the decrease of moisture content, and the permeability loss of fractured coal cores is usually significant (> 80%). Li et al (2014a) proposed that during the gas pressure reduction, the CO 2 permeability of coals with different ranks varies widely and the dominant factor is the effective stress effect where the larger the effective stress effect is, the lower the permeability is.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Permeability dynamic variation under the action of stress in the medium and high rank coal reservoir

Zhao

Tang

Lin³

et al. 2015

Journal of Natural Gas Science and Engineering

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Section: A N U S C R I P Tmentioning

confidence: 99%

Permeability dynamic variation under the action of stress in the medium and high rank coal reservoir

Zhao

Tang

Lin³

et al. 2015

Journal of Natural Gas Science and Engineering

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“…To express the evolution of permeability, the dimensionless permeability (DP) was introduced, which is defined below [32].…”

Section: Stress Sensitivity Coefficient Of Permeabilitymentioning

confidence: 99%

Seepage and Damage Evolution Characteristics of Gas-Bearing Coal under Different Cyclic Loading–Unloading Stress Paths

Zou

2018

Processes

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The mechanical properties and seepage characteristics of gas-bearing coal evolve with changes in the loading pattern, which could reveal the evolution of permeability in a protected coal seam and allow gas extraction engineering work to be designed by using the effect of mining multiple protective seams. Tests on gas seepage in raw coal under three paths (stepped-cyclic, stepped-increasing-cyclic, and crossed-cyclic loading and unloading) were carried out with a seepage tester under triaxial stress conditions. The permeability was subjected to the dual influence of stress and damage accumulation. After being subjected to stress unloading and loading, the permeability of coal samples gradually decreased and the permeability did not increase before the stress exceeded the yield stage of the coal samples. The mining-enhanced permeability of the coal samples in the loading stage showed a three-phase increase with the growth of stress and the number of cycles and exhibited an N-shaped increase under the stepped-cyclic loading while it linearly increased under the other two paths in the unloading stage. With the increase of peak stress and the accumulation of damage in coal samples, the sensitivity of the permeability of coal samples to stress gradually declined. The relationship between the damage variable and the number of cycles conformed to the Boltzmann function.

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“…Guo et al [21] suggested that the permeability of rocks is positively correlated with temperature and pressure after studying the influence of temperature on the permeability of rocks. Meng and Li [22] examined changes in the permeability of high-quality coal. Głowacki and Selvadurai [23] tested the permeability of limestone under different stresses and proposed an empirical spatial model of permeability evolution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Water-Inrush Risk Based on Permeability Evolution in Coal Mine and Backfill Prevention Discussion

Meng

Zhang

et al. 2019

Geofluids

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Induced by coal mining, the fractures constantly occur in geologic strata until failure occurs, which provide channels for water flow. Therefore, it is essential to investigate the permeability evolution of rocks under load. Borehole sampling was conducted in a bedrock layer beneath an aquifer, and the permeability evolution of sandstone specimens under different confining pressures was tested in rock mechanics testing laboratories. The results indicated that the permeability gradually decreases with the increasing confining pressures, while the peak strength increases with the increase of confining pressures. The minimum and maximum permeabilities occurred in the sandstone specimens that were subjected to elastic deformation and strain-softening stages, respectively. The failure, and maximum permeability, of these sandstone specimens did not occur simultaneously. To prevent the flow channel being formed due to the development and failure of rock fractures, a method of backfill gob was proposed and also the influence of backfill on fracture development was discussed.

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Experimental research on the permeability of high-rank coal under a varying stress and its influencing factors

Cited by 115 publications

References 27 publications

Permeability dynamic variation under the action of stress in the medium and high rank coal reservoir

Permeability dynamic variation under the action of stress in the medium and high rank coal reservoir

Seepage and Damage Evolution Characteristics of Gas-Bearing Coal under Different Cyclic Loading–Unloading Stress Paths

Experimental Investigation of Water-Inrush Risk Based on Permeability Evolution in Coal Mine and Backfill Prevention Discussion

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