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Mining Publication: Reservoir Simulation-Based Modeling for Characterizing Longwall Methane Emissions and Gob Gas Venthole Production
Keywords: Gob gas vent holes Longwall mining Methane Modeling
Original creation date: July 2007
Authors: C� Karacan, GS Esterhuizen, SJ Schatzel, WP Diamond
Peer Reviewed Journal Article - July 2007
Download PDF Document (2.72 MB)
NIOSHTIC2 Number: 20032380
Int J Coal Geol 2007 Jul; 71(2-3):225-245
Longwall mining alters the fluid-flow-related reservoir properties of the rocks overlying and underlying an extracted panel due to fracturing and relaxation of the strata. These mining-related disturbances create new pressure depletion zones and new flow paths for gas migration and may cause unexpected or uncontrolled migration of gas into the underground workplace. One common technique to control methane emissions in longwall mines is to drill vertical gob gas ventholes into each longwall panel to capture the methane within the overlying fractured strata before it enters the work environment. Thus, it is important to optimize the well parameters, e.g., the borehole diameter, and the length and position of the slotted casing interval relative to the fractured gas-bearing zones. This paper presents the development and results of a comprehensive, "dynamic," three-dimensional reservoir model of a typical multi-panel Pittsburgh coalbed longwall mine. The alteration of permeability fields in and above the panels as a result of the mining-induced disturbances has been estimated from mechanical modeling of the overlying rock mass. Model calibration was performed through history matching the gas production from gob gas ventholes in the study area. Results presented in this paper include a simulation of gas flow patterns from the gas-bearing zones in the overlying strata to the mine environment, as well as the influence of completion practices on optimizing gas production from gob gas ventholes.
Image of publication Reservoir Simulation-Based Modeling for Characterizing Longwall Methane Emissions and Gob Gas Venthole ProductionPeer Reviewed Journal Article - July 2007
Download PDF Document (2.72 MB)
NIOSHTIC2 Number: 20032380
Int J Coal Geol 2007 Jul; 71(2-3):225-245
See Also
A CART Technique to Adjust Production from Longwall Coal Operations under Ventilation Constraints
Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
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
A Methodology for Determining Gob Permeability Distributions and its Application to Reservoir Modeling of Coal Mine Longwalls
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 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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