Results 201 - 210 of 270

• Geology, Mining, and Methane Content of the Freeport and Kittanning Coalbeds in Indiana and Surrounding Counties, Pa.
  1/1/1979 - Reports of Investigations
  This study covers 25 underground mines that were active in the Upper and Lower Freeport and Lower Kittanning coalbeds in 1976. The coal ranges from low to medium volatile in rank.
• Forecasting Methane Hazards in Metal and Nonmetal Mines
  1/1/1979 - Reports of Investigations
  Because of the high number of accidental methane gas ignitions in metal and nonmetal mines, the Bureau of Mines searched for a simple guideline that would allow mine personnel to evaluate the methane hazard in a given mine.
• Electromagnetic Technique for Locating Boreholes
  1/1/1978 - Reports of Investigations
  The Bureau of Mines has developed hardware for electromagnetic (EM) detection and location of miners trapped in underground coal mines. This report describes a technique for using the developed equipment for locating uncased boreholes underground.
• Foam Stimulation To Enhance Production From Degasification Wells in the Pittsburgh Coalbed
  1/1/1978 - Reports of Investigations
  Seven degasification wells have been completed in the Pittsburgh coalbed at the New Emerald Mine near Waynesburg, Pennsylvania. The Bureau of Mines performed stimulation treatments on five of the wells.
• Methane Emissions from Gassy Coals in Storage Silos
  1/1/1978 - Reports of Investigations
  The methane gas emitted from coal samples collected from the conveyor belts dumping into silos was measured. Approximately 50 pct of the total gas desorbed into a sealed can within 1 week was released during the first 24 hours. No simple correlation bet...
• Methane Drainage: Experience With Hydraulic Stimulation Through Slotted Casing
  1/1/1978 - Reports of Investigations
  The Bureau of Mines examined the wellbore of a vertical gas drainage well in the Mary Lee coalbed to determine the results of specific completion procedures in coal. A jet-slotting tool was used to cut four vertical slots through the casing about 1 ft b...
• Gas-Sampling Capability of Vacutainers
  1/1/1978 - Reports of Investigations
  Tests were conducted to study shelf life of evacuated vacutainer samplers prior to sampling and also to check the stability of sampled gases prior to analysis.
• Methane Drainage Study in the Sunnyside Coalbed, Utah
  1/1/1978 - Reports of Investigations
  Discusses research to determine the effectiveness of long holes in degasifying an area of the upper split of the lower Sunnyside coalbed at Kaiser SteelCompany Sunnyside No. 1 mine. These holes were drilled from the two outside entries of a section that...
• Improved Methods for Monitoring Production From Vertical Degasification Wells
  1/1/1978 - Reports of Investigations
  In this Bureau of Mines investigation, production was monitored for 1 year at over 30 coalbed gas-drainage boreholes located in Alabama, Pennsylvania, and West Virginia.
• Experimental Studies on the Origin and Accumulation of Coalbed Gas
  1/1/1978 - Reports of Investigations
  The Bureau of Mines investigated factors that influence the formation of methane and other hydrocarbon gases in coal, which is an integral part of the coalification process.