Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7206466 | International Journal of Rock Mechanics and Mining Sciences | 2015 | 10 Pages |
Abstract
The results show that the GGVs drilled to extract gas from the stress-relief zone of the Pratt coal interval is highly effective in removing gas from the Upper Pottsville Formation. The radii of influence of the GGVs were in the order of 330-380Â m, exceeding the widths of the panels, due to bedding plane separations and stress relieved by fracturing. Material balance analyses indicated that the initial pressure of the Pratt coals, which was around 648Â KPa when longwall mining started, decreased to approximately 150Â KPa as the result of strata fracturing and production of released gas. Approximately 70% of the initial gas-in-place within the area of influence of the GGVs was captured during a period of one year.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geotechnical Engineering and Engineering Geology
Authors
C. Ãzgen Karacan,