Results 41 - 50 of 67

• Three Coal Mine Gob Degasification Studies Using Surface Boreholes and a Bleeder System
  1/1/1980 - Reports of Investigations
  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 Pittsbu...
• Review of Horizontal Drilling Technology for Methane Drainage From U. S. Coalbeds
  1/1/1980 - Information Circulars
  Reviews underground methane drainage programs being conducted in various coalbeds. Equipment used in drainage programs such as drills, underground pipelines, and methane monitoring systems is described.
• Drainage of Methane From the Overlying Pocahontas No. 4 Coalbed From Workings in the Pocahontas No. 3 Coalbed
  1/1/1979 - Reports of Investigations
  The Bureau of Mines conducted an experimental degasification project in Island Creek Coal Company Virginia Pocahontas No. 5 Mine. Methane from the overlying Pocahontas No. 4 Coalbed was entering mine workings in the Pocahontas No. 3 Coalbed through frac...
• Directional Drilling For Coalbed Degasification: Program Goals and Progress in 1978
  1/1/1979 - Reports of Investigations
  The Bureau of Mines is cooperating with the U.S. Department of Energy in a directional degasification project at the Emerald Mine near Waynesburg, Pennsylvania. This project is designed to combine the highly successful underground horizontal degasificat...
• Methane Content and Geology of the Hartshorne Coalbed in Haskell and Le Flore Counties, Okla.
  1/1/1979 - Reports of Investigations
  The Bureau of Mines developed data on the methane content of the Hartshorne coalbed, Haskell and Le Flore Counties, Oklahoma. The methane content is calculated to be between 1.1 and 1.5 trillion cubic feet. Methane increases with depth, but the rate of ...
• 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 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...
• Directionally Controlled Drilling To Horizontally Intercept Selected Strata, Upper Freeport Coalbed, Greene County, Pa.
  1/1/1977 - Reports of Investigations
  A 3-inch pilot hole was directionally drilled to intercept the Freeport coalbed horizon horizontally at Mather, Pennsylvania, as part of a Bureau of Mines degasification project. The original concept was to continue the horizontal drilling into the coal...
• 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...