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Numerical Simulation of Abandoned Gob Methane Drainage through Surface Vertical Wells
Wei Qin1, Jialin Xu1, Guozhong Hu1
1State Key Laboratory of Coal Resources and Mine Safety, School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu Province, China.
Plos One
|May 9, 2015
Summary
Gas seepage in abandoned gobs differs from normal mining areas. This study simulated rock strata movement and developed a numerical model to analyze methane drainage using surface wells, optimizing well placement for better gas control.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Environmental Engineering
Background:
- Ventilation system influence diminishes in abandoned gobs, altering gas seepage characteristics.
- Gas seepage in abandoned gobs significantly differs from that in normally mined areas.
Purpose of the Study:
- To investigate gas seepage characteristics in abandoned gobs.
- To develop a numerical model for abandoned gob methane drainage using surface wells.
- To determine optimal surface well locations for effective methane drainage.
Main Methods:
- Physical simulation of overlying rock strata movement.
- Derivation of a spatial distribution function for gob permeability.
- Establishment of a numerical model using FLUENT software.
- Importing the derived permeability function into the numerical model.
Main Results:
- The numerical model successfully simulated methane drainage through surface wells.
- Determined the control range of surface wells in abandoned gobs.
- Analyzed flow patterns and static pressure distribution under various well locations.
Conclusions:
- The study provides insights into gas seepage in abandoned gobs.
- The developed numerical model is effective for analyzing methane drainage strategies.
- Findings can guide the optimization of surface well placement for enhanced methane recovery and safety.
