Degasification Study from an Air Shaft in the Beckley Coalbed

Details

• Personal Author:
  Aul, George N. ; Cervik, Joseph ; Goodman, Tobias W.
• Corporate Authors:
  United States. Bureau of Mines
• Description:
  "The Bureau of Mines conducted research to degasify a virgin block of coal in the Beckley coalbed using long horizontal holes drilled in an array from the bottom of a ventilation air shaft. Eight horizontal holes and an in situ pressure hole were drilled in a radial pattern to depths ranging from 418 to 910 ft (127 to 277 m) and 205 ft (62 m), respectively. The investigation showed the shaft was in a basin saturated with water, which resulted in low gas flows from holes. The in situ pressure at 200 ft (61 m) into the coalbed was 79 psig (544.6 Kn/m2). The average gas and water flows for the eight holes were 94,100 ft3/day (2,665 m3/day) and 13 gal/min (49.3 L/min). After 514 days of degasification, 18.7 million ft3 (0.53 million m3) of gas had been drained. Methane face emissions, which were measured as a section advanced toward the shaft, were reduced about 77 pct, emphasizing the value of drainage by this technique. All holes were grouted before the area around the shaft was mined." - NIOSHTIC-2
  
  NIOSHTIC no. 10002392
  
  
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  West Virginia ; OSHA Region 3
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  19 numbered pages
• NIOSHTIC Number:
  nn:10002392
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:ef29fb1588f2eda71b1e7312767997b283739d8e84ac078d1a81cfbabde1aff3e66567ef6d7b7087d16a7e19dee5b21d77fe7af54f4038c7333cc8bf36d3df6b
• Download URL:
  https://stacks.cdc.gov/view/cdc/9361/cdc_9361_DS1.pdf
• File Type:
  [PDF - 1.11 MB ]