Storage Coefficients and Permeability Functions for Coal-Bed Methane Production Under Uniaxial Strain Conditions

Mathias, Simon A.; Nielsen, S. B.; Ward, Rebecca L.

doi:10.1007/s11242-019-01331-w

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…us, the vertical flow due to gravity cannot be ignored during permeability measurement. e Darcy expression of permeability measured by laminar fluid considering the effect of gravity is [34]…”

Section: Calculation Methods For Permeability After Devicementioning

confidence: 99%

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

Pang

Feng

Jiang

et al. 2020

Advances in Civil Engineering

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To analyze the internal pore evolution law of aquifer rock in a coal mining front under the coupling effect of stress and seepage and the influence on the water inrush performance of the working face, research on the working face was conducted to improve the RTR-1000 high-temperature and high-pressure rock triaxial mechanical testing system, using hollow cylindrical and complete sandstone samples and by considering the stress change law in the actual mining process as the reference loading path. At the initial stage of loading, the permeability of sandstone demonstrates a rapid downward trend within a small range of stress change, with a decline rate of 50%. At lower permeabilities, the fluctuation is small; the plastic and failure stages are transient, and the relationship curve between the horizontal permeability and the axial confining pressure of sandstone is divided into compaction, multiple fluctuations, surrender, and failure. In several stages, the sandstone lateral permeability experiment under the coupling effect of stress and seepage demonstrates that the permeability of the aquifer in the coal mining front is significantly reduced after the original rock stress is disturbed by mining, suggesting that the water inrush calculation of the traditional water-flowing fractured zone and caving zone aquifer rock permeability experiment is inaccurate. Further research can deepen the stress and seepage coupling evolution process under the action of working face water inrush.

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Section: Calculation Methods For Permeability After Devicementioning

confidence: 99%

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

Pang

Feng

Jiang

et al. 2020

Advances in Civil Engineering

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“…Therefore, the adsorption capacity of the coal matrix increases and the coal permeability corresponding decreases, which can not achieve a ideal displacement effect. 25,26 In contrast, ECBM recovery by N 2 injection is more advantageous in low-permeability coal reservoirs. That is due to the adsorption capacity of the coal matrix on N 2 is weaker than that on CH 4 , thereby CH 4 cannot be displaced through competitive adsorption.…”

Section: Introductionmentioning

confidence: 99%

A dynamic evolution model of coal permeability during enhanced coalbed methane recovery by N₂ injection: experimental observations and numerical simulation

Zhang

Ding

et al. 2021

RSC Adv.

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“…At present, many scholars have obtained various strainpermeability curves by means of experiments [14][15][16][17][18]. However, such studies were mainly based on small-scale rock samples, and for those cases where mining operations work above a highly confined aquifer, the whole panel floor shall be considered together.…”

Section: Introductionmentioning

confidence: 99%

Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

Fan

Zhang

et al. 2021

Geofluids

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The high-pressure and water-rich confined aquifer occurring in the Ordovician limestone sequence poses great threats to the routine production of underground longwall mining. Considering the intense cooperation of mining disturbance and water pressure, water-conducting fractures within a coal seam floor can connect the lower aquifer and upper goaf, and this hydraulic behavior is considered the root of water inrush hazard and water loss or contamination. In this paper, the panel 4301 of the Longquan coal mine serves as the case where the panel works closely above the floor with high water pressure. By the combination of physical and numerical modelling approaches, the variation characteristics of fracture development and volumetric strain of floor rocks subjected to mining disturbance are analyzed. A numerical computation model is constructed based on the volumetric strain-permeability equation obtained by curve fitting, and on such basis, the impacts of different mining parameters on floor rock permeability are studied. The results show that the floor rocks experience fracture generation, extension, and convergence procedures as the workface advances along the longitudinal direction, and fractures appearing in front of the workface are more developed. In the whole process of coal seam extraction, the volumetric strain profile exhibits “Λ” shape and an inverted saddle shape before and after overburden strata collapse. By controlling a single variable, the paper reveals that panel height is of greater impact on floor permeability changes than panel length and panel width.

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Storage Coefficients and Permeability Functions for Coal-Bed Methane Production Under Uniaxial Strain Conditions

Abstract: L. (2019) 'Storage coecients and permeability functions for coal-bed methane production under uniaxial strain conditions.', Transport in porous media., 130 (2). pp. 627-636.

Cited by 9 publications

References 19 publications

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

A dynamic evolution model of coal permeability during enhanced coalbed methane recovery by N₂ injection: experimental observations and numerical simulation

Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

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Storage Coefficients and Permeability Functions for Coal-Bed Methane Production Under Uniaxial Strain Conditions

Abstract: L. (2019) 'Storage coecients and permeability functions for coal-bed methane production under uniaxial strain conditions.', Transport in porous media., 130 (2). pp. 627-636.

Cited by 9 publications

References 19 publications

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

Experimental Study on Lateral Permeability Evolution of Sandstone under Seepage‐Damage Coupling

A dynamic evolution model of coal permeability during enhanced coalbed methane recovery by N2 injection: experimental observations and numerical simulation

Fracture Propagation and Hydraulic Properties of a Coal Floor Subjected to Thick-Seam Longwalling above a Highly Confined Aquifer

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A dynamic evolution model of coal permeability during enhanced coalbed methane recovery by N₂ injection: experimental observations and numerical simulation