Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio

Liu, Jishan; Chen, Zhongwei; Elsworth, Derek; Miao, Xiaoyu; Mao, Xianbiao

doi:10.1016/j.coal.2010.04.006

Cited by 144 publications

(61 citation statements)

References 31 publications

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“…In our previous studies (Zhang et al, 2008;Chen et al, 2009Chen et al, , 2010Liu et al, 2010aLiu et al, , 2010bWu et al, 2010Wu et al, , 2011, a series of single poroelastic, equivalent poroelastic, and dual poroelastic models were developed to simulate the interactions of multiple processes triggered by the injection or production of both single gas and binary gas. Many studies have also been carried out by other researchers (Cui et al, 2007;Bustin et al, 2008).…”

Section: Model Implementationmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis

Chen

Liu

Pan

et al. 2012

International Journal of Greenhouse Gas Control

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141

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Section: Model Implementationmentioning

confidence: 99%

“…This numerical model fully couples coal geomechanical deformation, gas flow, and gas adsorption/desorption induced coal matrix swelling/shrinkage processes (see Liu et al (2010b) for details). The core size is 45.0 mm in diameter and 105.5 mm in length with CH 4 injection at the left-hand side.…”

Section: Model Descriptionsmentioning

confidence: 99%

Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis

Chen

Liu

Pan

et al. 2012

International Journal of Greenhouse Gas Control

Self Cite

141

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“…After the first-mined seam and adjacent seam are determined, the equivalent relative interlayer spacing (Liu et al 2010b) can be calculated according to the occurrence of the coal strata, mining parameters for the working face, and interlayer lithology coefficient. The gas emissions from the gob of the working face are then divided into short-, medium-, and long-distance gas emissions, according to the relative spacing of the layers.…”

Section: Methods For Spatial and Comprehensive Gas Drainagementioning

confidence: 99%

Definition, theory, methods, and applications of the safe and efficient simultaneous extraction of coal and gas

Wang

Liu

et al. 2015

Int J Coal Sci Technol

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Simultaneous extraction of the coal and gas is an effective method of eliminating coal mine gas disasters while safely exploiting the coal and achieving efficient gas drainage in China, which is widely accepted by the main coal-producing countries around the world. However, the concrete definition of simultaneous extraction is vague and there is little accurate theoretical support for the simultaneous extraction of coal and gas, which makes it difficult to determine an efficient gas drainage method appropriate to the features of coal seams. Based on theoretical analysis, laboratory tests and field observations, a specific definition of simultaneous extraction of coal and gas is proposed after analyzing the characteristics of coal seam occurrences in China, and we developed the mechanism of mining-enhanced permeability and established the corresponding theoretical model. This comprises a process of fracture network formation, in which the original fractures are opened and new fractures are produced by unloading damage. According to the theoretical model, the engineering approaches and their quantitative parameters of 'unloading by borehole drilling' for single coal seams and 'unloading by protective seam mining' for groups of coal seams are proposed, and the construction principles for coal exploitation and gas-drainage systems for different conditions are given. These methods were applied successfully in the Tunlan Coal Mine in Shanxi Province and the Panyi Coal Mine in Anhui Province and could assure safe and efficient simultaneous extraction of coal and gas in these outburst coal mines.

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“…(5)- (7) into Eq. (4), we obtain (Liu et al, 2010): (8) where is standard atmospheric pressure. Equation (8) will be used to investigate gas flow behaviour in coal seam gas reservoir of this study.…”

Section: Flow Governing Equationsmentioning

confidence: 99%

“…3), thus coal directional permeability , , could be defined as follows (Liu et al, 2010;Liu et al, 1999):…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

Zheng

Chen

Kizil

et al. 2016

International Journal of Coal Geology

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Coal Mine Methane (CMM) drainage via adopting in-seam horizontal boreholes is an effective way to decrease ventilation cost and production delay, ensure mining safety, reduce greenhouse gas emissions and increase the supply of energy resource.Ventilation air leakage into borehole, however, occurs frequently, which decreases the methane-drainage efficiency. Despite extensive anti-leakage method investigations, a very few studies have been focused on spraying air-proof materials on the roadway rib and optimizing borehole sealing along the borehole, along with taking the effects of sequential excavations of roadway and borehole into account. In this paper, based on data of a real coal mine, a fully coupled mathematical model was developed by incorporating coal permeability with coal mechanical properties and gas adsorption/desorption and was then implemented into a Finite Element software. This numerical simulation was used to analyse transient stress and dynamic air-leakage flow fields around the drainage borehole. Simulation results indicate that: (1) Four stress areas (І to IV) exist around the roadway based on different relief status of the tri-axial stress, and stress distributions around the borehole in those four areas are different from each other; (2) Based on different air-leakage degrees, on the roadway rib, there are four air-leakage levels around borehole. Meanwhile, there are four leakage areas along the borehole: FAA, SAA, HAA and VAA, and the optimal sealing length should be over 17m (exceeding HAA) to prevent air leakage. Air-leakage results in (2) are verified mutually with the mechanics outcomes in (1). Meanwhile, real data obtained from field experiments is introduced to validate the simulation results. All those outcomes can allow for the optimal design of the spraying area and order and borehole sealing, thus provide scientific basis for an integrated anti-air-leakage method including spraying air-proof materials on the roadway wall and sealing borehole effectively, to prevent ventilation air leakage and maximize methane drainage performance.

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Linking gas-sorption induced changes in coal permeability to directional strains through a modulus reduction ratio

Cited by 144 publications

References 31 publications

Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis

Influence of the effective stress coefficient and sorption-induced strain on the evolution of coal permeability: Model development and analysis

Definition, theory, methods, and applications of the safe and efficient simultaneous extraction of coal and gas

Characterisation of mechanics and flow fields around in-seam methane gas drainage borehole for preventing ventilation air leakage: A case study

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