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Mining Publication: Reconciling Longwall Gob Gas Reservoirs and Venthole Production Performances Using Multiple Rate Drawdown Well Test Analysis
Keywords: Engineering controls Gases Longwall mining Ventilation monitoring systems
Original creation date: December 2009
Authors: C� Karacan
Peer Reviewed Journal Article - December 2009
Download PDF Document (0.74 MB)
NIOSHTIC2 Number: 20036109
Int J Coal Geol 2009 Dec; 80(3-4):181-195
In this paper, the production rate-pressure behaviors of six GGVs drilled over three adjacent panels were analyzed by using conventional multi-rate drawdown analysis techniques. The analyses were performed for infinite acting and pseudo-steady state flow models, which may be applicable during panel mining (DM) and after mining (AM) production periods of GGVs. These phases were analyzed separately since the reservoir properties, due to dynamic subsidence, boundary conditions and gas capacity of the gob reservoir may change between these two stages. The results suggest that conventional well test analysis techniques can be applicable to highly complex gob reservoirs and GGVs to determine parameters such as skin, permeability, radius of investigation, flow efficiency and damage ratio. The insights obtained from well test analyses can be used for a better understanding of the gob and for designing more effective gob gas venthole systems.
Image of publication Reconciling Longwall Gob Gas Reservoirs and Venthole Production Performances Using Multiple Rate Drawdown Well Test AnalysisPeer Reviewed Journal Article - December 2009
Download PDF Document (0.74 MB)
NIOSHTIC2 Number: 20036109
Int J Coal Geol 2009 Dec; 80(3-4):181-195
See Also
Analysis and Design Considerations for Superimposed Longwall Gate Roads
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Development of Stress Measurements and Instrument Placement Techniques for Longwall Coal
The Limiting Oxygen Concentration and Flammability Limits of Gases and Gas Mixtures
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Prediction of Longwall Methane Emissions: An Evaluation of the Influence of Mining Practices on Gas Emissions and Methane Control Systems
Prediction of Porosity and Permeability of Caved Zone in Longwall Gobs
Preventing Equipment Related Injuries in Underground U.S. Coal Mines
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Page last reviewed: September 21, 2012
Page last updated: September 21, 2012
Content source: National Institute for Occupational Safety and Health, Mining Program
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