To optimize the arrangement of a network of surface boreholes for abandoned gob methane extraction, a method for regional division of abandoned gobs based on their connectivity is proposed. Based on vertical and horizontal connectivity criteria, the abandoned gobs in Yangquan Coal Mine No. 3 are divided into 28 regions. Based on the abandoned gob methane sources, a calculation model for abandoned gob methane reserves is established. The abandoned gob methane reserves of connected regions in Yangquan Coal Mine No. 3 are predicted by using the developed estimation model. An abandoned gob methane extraction field test was conducted, and the results showed that the methane flow rate of vertical borehole #1 reached 3.6 m3/min. Based on the test results of vertical borehole #1 and the abandoned gob methane reserve calculation in the connected region, surface boreholes in a connected region were arranged in Yangquan Coal Mine No. 3.
- Abandoned gob methane,
- Green mining,
- Methane extraction,
- Network arrangement,
- Surface borehole
Available at: http://works.bepress.com/guang-xu/54/