Coupling model of gas seepage in low permeability coal seam considering start-up pressure gradient and its application

CHEN Liang; SHI Yongwei

doi:10.19835/j.issn.1008-4495.2020.02.014

Mining Safety & Environmental Protection > 2020 > 47(2): 70-75,80. > DOI: 10.19835/j.issn.1008-4495.2020.02.014

CHEN Liang, SHI Yongwei. Coupling model of gas seepage in low permeability coal seam considering start-up pressure gradient and its application[J]. Mining Safety & Environmental Protection, 2020, 47(2): 70-75,80. DOI: 10.19835/j.issn.1008-4495.2020.02.014

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Coupling model of gas seepage in low permeability coal seam considering start-up pressure gradient and its application

CHEN Liang^1,2,
SHI Yongwei^1,2

1. State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China;
2. CCTEG Chongqing Research Institute, Chongqing 400037, China

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Received Date: May 22, 2019
Revised Date: January 16, 2020
Available Online: September 16, 2022

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Abstract

Abstract

The low-velocity gas seepage in low permeability coal seam has the characteristic of non-darcy seepage. In order to reveal the seepage mechanism of non-darcy seepage phenomenon, the coupling law of gas seepage and coal and rock deformation with non-darcy seepage was studied. According to the characteristics of gas seepage in low-permeability coal seam and considering the non-darcy seepage law under the action of starting pressure gradient, the mechanism of free gas seepage, adsorption gas diffusion flow and coal and rock deformation were studied, and the seepage coupling model with starting pressure gradient was established, the model was used to carry out numerical simulation research on the pre-extraction borehole of this coal seam. The results show that the simulation results with considering starting pressure gradient are more consistent with the gas migration law in low-permeability coal seam. According to the simulation results, the borehole was arranged in the underground, and the gas extraction capacity of the pre-extraction borehole in the working face was 1.09 m³/t, the extraction effect was ideal.
- low permeability coal seam,
- gas extraction,
- starting pressure gradient,
- seepage coupling model,
- borehole extraction,
- numerical simulation,
- field application

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