Results 81 - 90 of 242

• Prediction of Porosity and Permeability of Caved Zone in Longwall Gobs
  3/1/2010 - Peer reviewed journal articles
  This work presents a fractal porous medium model to predict gob porosity and permeability for controlling methane flow and to predict air leakage into the gob.
• Historical Development of Technologies for Controlling Methane in Underground Coal Mines
  1/1/2010 - Conference papers
  This paper discusses several milestone events that show the progress of methane control research in underground coal mines.
• Reconciling Longwall Gob Gas Reservoirs and Venthole Production Performances Using Multiple Rate Drawdown Well Test Analysis
  12/1/2009 - Peer reviewed journal articles
  In this paper, the production rate-pressure behaviors of six gob gas ventholes drilled over three adjacent panels were analyzed by using conventional multi-rate drawdown analysis techniques.
• Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
  11/1/2009 - Conference papers
  This paper demonstrates the applications of coal bed reservoir engineering and modeling techniques for optimizing and controlling methane emissions in longwall and continuous miner sections.
• Frictional Ignitions in Underground Bituminous Coal Operations 1983-2005
  8/1/2009 - Peer reviewed journal articles
  NIOSH conducted a statistical study of available data regarding frictional ignitions in the United States from 1983 to 2005 to determine and define conditions controlling their occurrence.
• The Limiting Oxygen Concentration and Flammability Limits of Gases and Gas Mixtures
  6/1/2009 - Peer reviewed journal articles
  This paper presents data on the limiting (minimum) oxygen concentration in the presence of added N₂, methane, propane, ethylene, carbon monoxide, and hydrogen and some of their binary mixtures, and addresses flammable concentration limits.
• Modeling Methane Emissions and Ventilation Needs by Examination of Mining Induced Permeability Changes and Related Damage to Ventilation Controls
  6/1/2009 - Conference papers
  This paper aims to examine the effects of porosity and permeability changes of the coal seam on methane emissions in an underground continuous miner section.
• Reservoir Rock Properties of Coal Measure Strata of the Lower Monongahela Group, Greene County (Southwestern Pennsylvania), from Methane Control and Production Perspectives
  3/1/2009 - Peer reviewed journal articles
  This study presents reservoir and elastic properties of coal measure rocks in the Lower Monongahela Group in Greene County, southwestern Pennsylvania, with results that can be used as data sources for reservoir studies related to methane control.
• Gas Sorption and Transport in Coals: A Poroelastic Medium Approach
  1/1/2009 - Peer reviewed journal articles
  In this paper, single-component gas sorption and transient diffusion processes are described within coal matrix exhibiting bimodal pore structure.
• NIOSH Research for Monitoring and Controlling Methane at U.S. Underground Coal Mining Operations
  11/1/2008 - Conference papers
  This work by NIOSH has modelled the impacts of borehole pattern and design and the effects of increasing face length on gob gas venthole performance.