Results 31 - 40 of 62

• 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...
• 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...
• 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.
• Methane Accumulations in Coal Mine Roof Cavities
  1/1/1978 - Reports of Investigations
  The Bureau of Mines investigated the presence and extent of methane accumulations in mine roof cavities using a full-scale mine model. Methane was released at a constant rate into the roof of a cavity built onto a 700-ft wind tunnel.
• Estimating Methane Content of Bituminous Coalbeds From Adsorption Data
  1/1/1977 - Reports of Investigations
  The Bureau of Mines estimated the methane content of a coal, which depends primarily upon rank and pressure, from the adsorption equation V = kPn, where k and n are constants related to rank.
• Methane Absorption in Oil Shale and Its Potential Mine Hazard
  1/1/1977 - Reports of Investigations
  The Bureau of Mines made laboratory absorption measurements on oil shale samples, which showed that the amount of methane absorbed is proportional to pressure and oil yield, and can be much larger than would be predicted based solely on porosity. Oil sh...
• Geology and Methane Content of the Upper Freeport Coalbed in Fayette County, Pa.
  1/1/1977 - Reports of Investigations
  The Upper Freeport coalbed was studied in Fayette County, Pennsylvania. This coalbed lies about 650 feet below the Pittsburgh coalbed and contains the largest remaining reserves of any coalbed in the county.
• Methane Emissions from Four Working Places in the Beckley Mine, Raleigh County, W. Va.
  1/1/1977 - Reports of Investigations
  The Beckley Mine is one of five new mines in a heretofore unmined portion of the Beckley coalbed. The remoteness of these new mines from prior mining and their greater overburden preclude applying methane emission experience obtained in the old mines. F...
• Hydraulic Stimulation of a Surface Borehole for Gob Degasification
  1/1/1977 - Reports of Investigations
  The Bureau of Mines evaluated the hydraulic stimulation of a gob degasification borehole to determine if this procedure would aid in degasifying a longwall panel.