Mining Publication: Effect of a Surface Borehole on Longwall Gob Degasification (Pocahontas No. 3 Coalbed)
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Original creation date: January 1972
The use of a partially slotted 6.5-Inch-inside-diameter vertical pipe to remove methane from a longwall gob area at a depth of 2,260 feet in the Pocahontas No. 3 Coalbed was investigated. The value of gas removed by such a pipe under free-flow conditions was found to equal the cost of the installation in this case. Approximately 25 percent of the available methane passed through the pipe without the use of an exhauster; an additional 10 percent was removed when an exhauster was employed. The diversion of methane through a vertical slotted pipe to the surface permitted the use of increased mining rates and decreased the ventilation air requirements.
Authors: TD Moore, MG Zabetakis
Report of Investigations - January 1972
NIOSHTIC2 Number: 10000672
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, NTIS No. PB-211931, RI 7657, 1972 Jan; :1-9,
See Also
- The Borehole Monitoring Experiment: Field Measurements of Reservoir Conditions and Responses in Longwall Panel Overburden During Active Mining
- Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
- Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed
- MCP - Methane Control and Prediction - 2.0
- Methane Control on Longwalls with Cross-Measure Boreholes (Lower Kittanning Coalbed)
- A Methodology for Determining Gob Permeability Distributions and its Application to Reservoir Modeling of Coal Mine Longwalls
- A New Methane Control and Prediction Software Suite for Longwall Mines
- Probabilistic Modeling Using Bivariate Normal Distributions for Identification of Flow and Displacement Intervals in Longwall Overburden
- Reservoir Simulation-Based Modeling for Characterizing Longwall Methane Emissions and Gob Gas Venthole Production
- Underground Gob Gas Drainage During Longwall Mining
- Content source: National Institute for Occupational Safety and Health, Mining Program