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Mining Publication: Characterization of Gas Flow in Longwall Gobs: Pittsburgh Coalbed, PA
Keywords: Gob gas vent holes Longwall mining
This page is archived for historical purposes and is no longer being maintained or updated. Contact NIOSH Mining if you need an accessible version.
Original creation date: May 1999
Authors: WP Diamond, SJ Schatzel, F Garcia, JC LaScola, FE McCall, PW Jeran, TP Mucho
Conference Paper - May 1999
Download PDF Document (0.20 MB)
Proceedings of the International Coalbed Methane Symposium, Tuscaloosa, AL, May 3-7, 1999. Tuscaloosa, AL: University of Alabama, 1999 May; :233-244
The National Institute for Occupational Safety and Health, Office for Mine Safety and Health Research, is investigating the geologic and mining factors influencing the migration of longwall gob gas. One goal of these studies is to optimize methane drainage strategies to reduce the volume of gob gas that reaches the underground workplace. As part of this research effort, longwall gob gas flow paths in a mine operating in the Pittsburgh Coalbed, PA, were investigated using SF6 tracer gas. Tracer gas released into the ventilation airflow underground generally stayed in the bleeder system and was vented at the associated bleeder fan shafts. Tracer gas injected into an inactive (intaking) gob gas venthole migrated to the two inby producing ventholes on the study panel, indicating that all three ventholes were in communication. The tracer gas that was injected into the gob generally stayed in the gob and only migrated to the ventilation system in response to the venthole on the study panel closest to the injection hole going off production. Tracer gas flow velocities in the longwall gob reservoir and factors influencing the production performance of gob gas ventholes in the study area are also discussed.
Image of publication Characterization of Gas Flow in Longwall Gobs: Pittsburgh Coalbed, PAConference Paper - May 1999
Download PDF Document (0.20 MB)
Proceedings of the International Coalbed Methane Symposium, Tuscaloosa, AL, May 3-7, 1999. Tuscaloosa, AL: University of Alabama, 1999 May; :233-244
See Also
Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Development and Application of Reservoir Models for the Evaluation and Optimization of Longwall Methane Control Systems
Effect of a Surface Borehole on Longwall Gob Degasification (Pocahontas No. 3 Coalbed)
Forecasting Gob Gas Venthole Production Performances Using Intelligent Computing Methods for Optimum Methane Control in Longwall Coal Mines
Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
A New Methane Control and Prediction Software Suite for Longwall Mines
Reservoir Simulation-Based Modeling for Characterizing Longwall Methane Emissions and Gob Gas Venthole Production
Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
Page last reviewed: July 22, 2016
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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