Impact of Effective Stress and Matrix Deformation on the Coal Fracture Permeability

Guo, Pinkun; Wang, Chenghao; Jin, Kan; Li, Wei; Tu, Qingyi; Liu, Hongyong

doi:10.1007/s11242-014-0289-4

Cited by 112 publications

(65 citation statements)

References 33 publications

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“…These theories provide a basis for gas extraction technologies. [39][40][41] These models only explore the influence of pore pressure on permeability and porosity on the premise that the external stress remains constant. 27 Coal is a typical porous medium.…”

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confidence: 99%

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Pan

Huang

et al. 2019

Energy Science & Engineering

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Gas disasters are a major factor influencing safe production in mines: Gas extraction can reduce the gas content in coal seams, providing a guarantee of safer production. The parameters for gas extraction are the primary factors influencing the effectiveness thereof. Aiming at the creep properties of soft coal, a fluid‐solid coupling mathematical model considering creep properties of coal was established based on dynamic evolution equation for permeability considering the effects of matrix shrinkage and effective stress. Additionally, by utilizing COMSOL Multiphysics software, the gas extractions from a single borehole and multiple boreholes were calculated. Moreover, the parameters for gas extraction were optimized and applied and tested in field conditions. The result showed the reduction in gas pressure around the boreholes was larger than that from a single borehole when conducting gas extraction from multiple boreholes. The borehole spacing when extracting gas in coal seams by drilling multiple boreholes should be more than twice that of the effective drainage radius. The optimal borehole spacing ranged from 3.2 to 4.2 m for gas extraction lasting 180 d. Numerical simulation was carried out to ascertain the distribution of stress on coal around a roadway. The result revealed that the damage radius of the roadway was 11.8 m, and a reasonable hole‐sealing depth was 12 m. On condition that the borehole spacing during gas extraction from multiple boreholes was 4 m, the reasonable pre‐extraction time was 180 days taking the gas pressure being reduced to <0.74 MPa as a critical point. Furthermore, the gas content, the amount of extracted gas, etc, in a working face after the parameters for gas extraction were optimized were measured. The result suggested that the effect of gas extraction after optimizing parameters conformed to industry standards.

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Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Pan

Huang

et al. 2019

Energy Science & Engineering

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“…For example, to reduce the permeability in the sealing part, Xia et al (2014) used fine expansive particles to seal the leakage fractures around the borehole; Liu et al (2014) developed new sealing materials and performed grouting two or more times with high grouting pressure. To increase the permeability in the drainage area, Guo et al (2014) and Lu et al (2009) used the water-jet technique to fracture the coal around the borehole and enhance the permeability. In practice, a reasonable sealing depth should be first determined for the borehole, then measures taken to change the permeability in the sealing part or drainage zones, according to the technical conditions in the coal mine.…”

Section: Discussion Of Methods To Enhance Drainage Effectmentioning

confidence: 99%

“…In the present study, the widely-used cubic relationship between permeability and porosity was used (Guo et al, 2014), as shown in Eq. (1).…”

Section: Boundarymentioning

confidence: 99%

Determination of sealing depth of in-seam boreholes for seam gas drainage based on drilling process of a drifter

Zhang

Sun

et al. 2016

Engineering Geology

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“…Because ground stress and gas pressure affect the internal connectivity of porous media, permeability is certain to be related to these two parameters. The coal permeability model that considers the effect of the effective stress and coal matrix deformation (ESMD model) is given as [29]:…”

Section: (I) Coalbed Gas Flowmentioning

confidence: 99%

Addressing the CO 2 emissions of the world's largest coal producer and consumer: Lessons from the Haishiwan Coalfield, China

Younger

Wang

et al. 2015

Energy

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Impact of Effective Stress and Matrix Deformation on the Coal Fracture Permeability

Cited by 112 publications

References 33 publications

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Numerical simulation of boreholes for gas extraction and effective range of gas extraction in soft coal seams

Determination of sealing depth of in-seam boreholes for seam gas drainage based on drilling process of a drifter

Addressing the CO 2 emissions of the world's largest coal producer and consumer: Lessons from the Haishiwan Coalfield, China

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