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Mining Publication: Control of Longwall Gob Gas With Cross-Measure Boreholes (Upper Kittanning Coalbed)
Keywords: Cross measure boreholes Gobs Methane
Original creation date: January 1983
Authors: AA Campoli, J Cervik, SJ Schatzel
Report of Investigations - January 1983
Download PDF Document (2.35 MB)
NIOSHTIC2 Number: 10003257
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 8841, NTIS No. PB84-159540, 1983; :1-17
The cross-measure borehole technique is being studied by the Bureau of Mines as an alternative to the use of surface gob boreholes as a means of controlling methane in gobs during longwall mining. Small-diameter holes are drilled from underground locations into strata overlying the mined coalbed. When the roof strata are fractured by the mining operation, a partial vacuum applied to the boreholes draws the methane out of the fractured strata and prevents it from entering the mine ventilation system. Tests in the Upper Kittanning coalbed showed that 50 pct of the methane produced by the longwall mining operation was captured by the cross-measure boreholes. Borehole inclination and penetration into the gob are two important borehole parameters that affect the performance of the cross-measure borehole system.
Image of publication Control of Longwall Gob Gas With Cross-Measure Boreholes (Upper Kittanning Coalbed)Report of Investigations - January 1983
Download PDF Document (2.35 MB)
NIOSHTIC2 Number: 10003257
U.S. Department of the Interior, Bureau of Mines. Report of Investigations 8841, NTIS No. PB84-159540, 1983; :1-17
See Also
An Analysis of Reservoir Conditions and Responses in Longwall Panel Overburden During Mining and its Effect on Gob Gas Well Performance
Comparisons Between Cross-Measure Boreholes and Surface Gob Holes
Effect of a Surface Borehole on Longwall Gob Degasification (Pocahontas No. 3 Coalbed)
Lightning Propagation Through the Earth and its Potential for Methane Ignitions in Abandoned Areas of Underground Coal Mines
Longwall Gob Degasification With Surface Ventilation Boreholes Above the Lower Kittanning Coalbed
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 Method to Calculate Permeability of Gob for Air Leakage Calculations and for Improvements in Methane Control
Probabilistic Modeling Using Bivariate Normal Distributions for Identification of Flow and Displacement Intervals in Longwall Overburden
Underground Gob Gas Drainage During Longwall Mining
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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