Development of anisotropic permeability during coalbed methane production

Wu, Yu; Liu, Jishan; Elsworth, Derek; Miao, Xiaoyu; Mao, Xianbiao

doi:10.1016/j.jngse.2010.06.002

Cited by 141 publications

(58 citation statements)

References 36 publications

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“…Mohsen et al [32] also pointed out that the permeability model under vertical stress change should be considered and needs to find a balance between the complexity of the permeability model and the accuracy of the field permeability data. In this study, we use the dynamic permeability variation model proposed by Wu et al [33] to study the CBM extraction under the mining pressure. However, unlike Wu's model, the coupling effect of gas mixture pressure and different cycle mining pressures on gas migration was studied in this paper.…”

Section: Dynamic Permeability Model Of Coal Seammentioning

confidence: 99%

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The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China

Zhang

et al. 2018

Geofluids

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Gas outburst has always affected the safety of coal mining. To eliminate this risk by high-efficiency extraction of coalbed methane (CBM) in 4102 working face of number 3 coal seam in Hebi Number 3 coal mine, a model of CBM extraction in working face was established which was considering the mining impact of adjacent 4101 working face. In this model, the coupling relationships between stress, desorption, and migration of methane were analyzed. Moreover, we also studied the changes of methane pressure, plastic failure scope, and permeability of coal during the mining and then verified the results with the field data. And on this basis, a stimulation solution for methane extraction by injecting air into coal seam was presented, and the extraction effect was simulated. The simulation results show that the injection of air decreases the effective stress of coal which increases the permeability of coal and promotes the methane migration within the coal seam fractures. Besides, affected by the velocity of gas migration, the pressure drop between fractures and matrix will reduce with time while air injection can provide extra power for gas migration in fractures which causes the desorption and diffusion of methane in the matrix. So this stimulation solution can enhance the efficiency of gas extraction of coal seam and prevent gas outburst of the working face.

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Section: Dynamic Permeability Model Of Coal Seammentioning

confidence: 99%

“…where ϕ m is the real-time porosity of the matrix and the subscript "0" indicates the initial state; ε V = ε 11 + ε 22 + ε 33 indicates the deformation of the representative element volume; and ε S = ε L p m1 / p m1 + P L is the gas adsorption strain in pores.…”

Section: Dynamic Permeability Model Of Coal Seammentioning

confidence: 99%

The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China

Zhang

et al. 2018

Geofluids

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“…1 [53,59], which comprises the coal matrix and the coal fractures. The edge dimension of the matrix blocks and the fracture aperture are represented by a and b, respectively, K n is the fracture stiffness, and σ e is the effective stress.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Previous work [53,59,61,62] suggested that the porosity and permeability model for coal fracture could be defined as…”

Section: Dynamic Permeability Modelsmentioning

confidence: 99%

“…3b. Most parameters of the model (as listed in Table 1) are chosen from the experimental results, whereas the unreported parameters are substituted from the contemporary literature [28,53,59]. The parameters of different boreholes are shown in Table 2, in which the fracture aperture b 2 of the affected zone is obtained from the history matching of gas drainage and the numerical parameter inversion.…”

Section: Validationmentioning

confidence: 99%

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A fully coupled coal deformation and compositional flow model for the control of the pre-mining coal seam gas extraction

Xia

Zhou

Liu

et al. 2014

International Journal of Rock Mechanics and Mining Sciences

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128

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The permeability properties of bedded coal and rock: Review and new insights

Song

Zhang

et al. 2022

Energy Science & Engineering

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It is beneficial to understand deeply the permeability properties of coal and rock for the stability control of mining engineering, underground engineering, oil and gas engineering, nuclear waste storage engineering, and so on. Therefore, new insights for the permeability properties of bedded coal and rock are summarized and proposed. (1) "Five guarantees" coring technology is worth for vigorous promotion and application. (2) The internal spatial fabric has the significant effect on the mechanical behavior evolution law of (bedded) coal and rock, but the effect is not dominant. (3) The permeability‐energy evolution models of (bedded) coal and rock should be constructed considering the idea of initial high in situ stress reduction, which is helpful for the energy visualization characterization of (bedded) coal and rock. Meanwhile, it can be combined with the structural evolution theory for in‐depth characterization and disclosure. (4) Researches on the permeability properties of (bedded) coal and rock under multi‐field or multi‐phase or phase‐field coupling conditions should be strengthened based on considering the initial damage produced and the distribution characteristics of in situ stress under the coring environment. (5) More accurate and scientific permeability evolution models of (bedded) coal and rock should be vigorously constructed based on the above insights.

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Development of anisotropic permeability during coalbed methane production

Cited by 141 publications

References 36 publications

The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China

The Migration of Coalbed Methane under Mining Pressure and Air Injection: A Case Study in China

A fully coupled coal deformation and compositional flow model for the control of the pre-mining coal seam gas extraction

The permeability properties of bedded coal and rock: Review and new insights

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