Laboratory investigation of gas permeability and its impact on CBM potential

Kumar, Harinandan; Mishra, Manoj Kumar; Mishra, Sudhir

doi:10.1007/s13202-017-0425-0

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…We determined that this error rate occurred due to the small size of the sample and the assumptions of the model, such as homogeneous medium and isotropic permeability. The diffusion coefficient calculated by the history matching was 2.66 × 10 −10 cm 2 /s, which is reasonable compared with the typical value calculated from experiment studies [32][33][34]. The cleat properties, fracture permeability and fracture porosity, were adjusted from 4 mD to 23.85 mD, and from 0.005 to 0.15 because of the large number of cleats compared to the area of coals.…”

Section: Simulation Resultssupporting

confidence: 76%

Experimental and Simulation Studies on Adsorption and Diffusion Characteristics of Coalbed Methane

et al. 2019

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Coalbed methane (CBM) content is generally estimated using the isotherm theory between pressure and adsorbed amounts of methane. It usually determines the maximum content of adsorbed methane or storage capacity. However, CBM content obtained via laboratory experiment is not consistent with that in the in-situ state because samples are usually ground, which changes the specific surface area. In this study, the effect of the specific surface area relative to CBM content was investigated, and diffusion coefficients were estimated using equilibrium time analysis. The differences in adsorbed content with sample particle size allowed the determination of a specific surface area where gases can adsorb. Also, there was an equilibrium time difference between fine and lump coal, because more time is needed for the gas to diffuse through the coal matrix and adsorb onto the surface in lump coal. Based on this, we constructed a laboratory-scale simulation model, which matched with experimental results. Consequently, the diffusion coefficient, which is usually calculated through canister testing, can be easily obtained. These results stress that lump coal experiments and associated simulations are necessary for more reliable CBM production analysis.

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Section: Simulation Resultssupporting

confidence: 76%

Experimental and Simulation Studies on Adsorption and Diffusion Characteristics of Coalbed Methane

et al. 2019

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“…According to the recorded gas instantaneous flow rate and the set constant osmotic pressure difference, the real-time permeability of coal can be calculated. Coal seam permeability is usually calculated using Darcy's equation as (Kumar et al 2018):…”

Section: Seepage Characteristicsmentioning

confidence: 99%

Mechanical behaviour and seepage characteristics of coal under the loading path of roadway excavation and coal mining

Xie

Gao

et al. 2021

Geomatics, Natural Hazards and Risk

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The mechanical behaviour and seepage characteristics of coal under the mining engineering disturbance are of great significance to prevent gas disasters. Based on the geological conditions of the No. 12 mine of the China Pingdingshan Mining Group, the mechanical seepage experiments of coal under the stress path of roadway excavation and coal mining were carried out. The experimental result shows that: The coal in fracture zone is most strongly affected by the roadway excavation. The samples showed obvious expansion phenomenon, and their cracks were the most complex. They formed effective permeability before the peak strength, and their permeability was the largest; the coal in disturbance zone is less affected by roadway excavation, and the coal samples formed effective permeability after the peak strength. Their permeability was smaller than the samples in fracture zone; the coal in original rock stress zone is only affected by coal mining, and its crack growth degree is the lowest. The coal samples formed stable permeability in the residual strength stage, and their permeability was the smallest. In practical engineering, special attention should be paid to the sudden gas gushing caused by the sudden increase of coal seam permeability, which will cause gas disaster.

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“…Coal permeability decreases exponentially with increasing effective stress, due to reducing and closing of flow channels in pores and fractures [33][34][35][36][37][38][39][40][41][42][43]. Increase of the depth of the coal seams and resulting increase of confining pressure induces pronounced decrease of its permeability in comparison with unburdened coal, even to several orders of magnitude, at depths below 1000 m [44][45][46]. Furthermore, rock permeabilities to sorbed gases are lower than rock permeabilities to non-sorbed or poorly sorbed gases [47].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Studies on Permeability of Coals Using Briquettes: Understanding Underground Storage of CO2

2022

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The work presents the laboratory studies on permeability of two bituminous coal briquettes under confining pressure conditions. The research was carried out in order to assess the possibility of using bituminous coal as a sorbent for CO2 storage in underground seams. Coal permeability tests were carried out on an original apparatus for testing seepage processes under isobaric conditions on samples subjected to confining pressure. In order to determine the impact of the load on the coal briquettes’ permeability, the tests were carried out at four confining pressures: 1.5, 10, 20 and 30 MPa. The obtained results showed that the coal permeability decreases with an increase in confining pressure. At depths below 250 m, the coal can be a rock poorly permeable to CO2, and under such conditions, the applicability of technologies related to the underground storage of CO2 to coal seams is limited or even impossible.

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Laboratory investigation of gas permeability and its impact on CBM potential

Cited by 12 publications

References 28 publications

Experimental and Simulation Studies on Adsorption and Diffusion Characteristics of Coalbed Methane

Experimental and Simulation Studies on Adsorption and Diffusion Characteristics of Coalbed Methane

Mechanical behaviour and seepage characteristics of coal under the loading path of roadway excavation and coal mining

Laboratory Studies on Permeability of Coals Using Briquettes: Understanding Underground Storage of CO2

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