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Gas extraction challenge and the application of hydraulic cavity technology in the Shijiazhuang coalmine, Qinshui basin

journal contribution
posted on 2024-11-17, 13:26 authored by Hao Zhang, Yuanping Cheng, Liang Yuan, Liang Wang, Jingyu Jiang, Guofang Li
Hydraulic cavity has been demonstrated to be an efficient gas extraction technology in the single, soft, and low-permeability coal seam in China. However, the permeability evolution around hydraulic cavity has not been fully understood due to the lack of the permeability model in the post-peak stage, which leads to a great challenge for the gas extraction simulation and thus the borehole design. Therefore, we developed a fully coupled dual-porosity gas extraction model that considers the effects of coal damage on the permeability evolution. Based on this model, we analyzed the permeability evolution and the gas migration characteristics around the hydraulic cavity and designed a hydraulic cavity scheme for the Shijiazhuang coalmine. The field application results prove that our simulation results are correct.

Funding

Fundamental Research Funds for the Central Universities (2017XKZD01)

History

Journal title

Energy Sources, Part A: Recovery, Utilization and Environmental Effects

Volume

43

Issue

5

Pagination

611-633

Language

English

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