Results 91 to 100 of about 246,283 (173)
Meikuang AnquanIn the area with complex hydrogeological conditions, the water abundance of surrounding rock and the amount of replenishment to the coal seam is of an important impact on the propagation speed of pressure in the coal seam during drainage, and are the key
Yafei ZHANG +4 more
doaj +1 more source
Methane control on longwalls with cross-measure boreholes (Lower Kittanning Coalbed) [PDF]
"The cross-measure borehole technique has been shown by the Bureau of Mines to be an effective method of controlling methane liberated by fracturing the roof strata in longwall gobs where overburden is less than 750 ft (229 m). Boreholes are drilled into
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Methane emission rate study in a deep Pocahontas No. 3 coalbed mine in conjunction with drilling degasification holes in the coalbed [PDF]
"A degasification experiment was conducted in a Pocahontas No. 3 Coalbed mine in Virginia. It involved (1) drilling holes in the coalbed in the outside headings of a set of five being developed in virgin area and (2) conducting a methane emission rate ...
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Methane emission rate studies in a northern West Virginia mine [PDF]
"Methane emission rates were studied in a Pittsburgh coalbed mine in northern West Virginia. A fullface boring-type continuous miner, equipped with a methane monitor, was used in the development of a set of eight main headings, one side of which was near
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Methane emission from U.S. coal mines : a survey [PDF]
This survey was conducted to determine the magnitude of the methane emission and control problem in U.S. bituminous coal mines. The resultant data indicate that the emission rate for any given coalbed depends primarily on the coal production rate and on ...
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, 2007 Biogenic methane is a common constituent in deep subsurface environments such as coalbeds and oil shale beds. Coalbed methane (CBM) makes significant contributions to world natural gas industry and CBM production continues to increase.
Jin, Song
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Methane control by isolation of a major coal panel : Pittsburgh coalbed [PDF]
"As one of its projects for degasification of major panels of coal prior to mining within them, the Bureau of Mines conducted methane emission studies during development of a set of three headings 1,800 feet in a major coal panel (2,700 by 3,500 feet ...
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Methane drainage study in the Sunnyside coalbed, Utah [PDF]
"The Bureau of Mines is conducting research to determine the effectiveness of long holes in degasifying an area of the upper split of the lower Sunnyside coalbed at Kaiser SteelCompany's Sunnyside No. 1 mine. These holes were drilled from the two outside
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Guidelines for the prediction and control of methane emissions on longwalls [PDF]
"Although longwall mining productivity can far exceed that of room-and-pillar mining, the total methane emissions per extracted volume associated with longwall sections are generally higher than those for continuous miner or pillar removal sections ...
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Methane emission from U.S. coal mines in 1975 : a survey : a supplement to Information circulars 8558 and 8659 [PDF]
This Bureau of Mines report tabulates methane emissions from U.S. bituminous coal mines with daily emission rates of at least 100,000 cfd according to States, counties, and coalbeds.
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