Mining Publication: Three Coal Mine Gob Degasification Studies Using Surface Boreholes and a Bleeder System
Original creation date: January 1980
The use of vertical surface degasification boreholes with bleeder systems and the use of a timbered bleeder system to degasify gob areas were studied by the Bureau of Mines. This report describes three gob degasification studies conducted in the Pittsburgh coalbed. One study was conducted to determine the number of panels degasified with one large borehole. The study showed that the borehole provided degasification for three panels. Another study was conducted during the retreat of a 35-acre panel with a single- entry and a two-entry bleeder system and a large surface borehole. A major portion of methane emitted from the panel was carried away by the borehole, leaving the bleeder entries relatively free of methane. The last study was made to determine the effectiveness of a timbered bleeder system. The bleeder entries successfully degasified the gob area when enough entries were available and adequate pressure was available to force the air through roof falls.
Authors: SD Maksimovic, FN Kissell
Report of Investigations - January 1980
NIOSHTIC2 Number: 10000739
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8459, 1980 Jan; :1-10
- Coal Mine Methane: A Review of Capture and Utilization Practices with Benefits to Mining Safety and to Greenhouse Gas Reduction
- Evaluation of the Relative Importance of Coalbed Reservoir Parameters for Prediction of Methane Inflow Rates During Mining of Longwall Development Entries
- Hydraulic Stimulation of a Surface Borehole for Gob Degasification
- Methane and Dust Controls for Longwalls: Pocahontas No. 3 Coalbed, Grundy, Va.
- Methane Control by Isolation of a Major Coal Panel - Pittsburgh Coalbed
- Methane Drainage and Migration
- Methane Emissions from Four Working Places in the Beckley Mine, Raleigh County, W. Va.
- A Numerical Evaluation on the Effects of Impermeable Faults on Degasification Efficiency and Methane Emissions During Underground Coal Mining
- Removing Methane (Degasification) from the Pittsburgh Coalbed in Northern West Virginia
- Two-Phase Flow in Coalbeds
- Content source: National Institute for Occupational Safety and Health, Mining Program