Results 61 to 70 of about 6,445 (232)
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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Coalbed Methane Production: Why Coal Permeability Matters
, 2010 When coalbed methane is recovered, complex interactions of stress and chemistry have a strong influence on the properties of the coal. These include influences on gas desorption and flow, coal deformation, porosity change and permeability modification ...
Luke D. Connell +3 more
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Shiyou jixieDeep coal-rock gas reservoir is sensitive to downhole pressure variation， and implementing kill operation may cause damage to gas production. Consequently， a full-process pressure-maintained operation technique of dual-tubing jet pump for deep coal-rock ...
Wu Jianjun +6 more
doaj +1 more source
Peat, coal and coalbed methane [PDF]
Multiple stratigraphic intervals in the subsurface of the Netherlands contain layers of peat and coal. These include (pre-)Holocene peat, Miocene lignite and upper Carboniferous (Westphalian) bituminous coal and anthracite, all of which have played important roles as energy sources in the country.
Bergen, F. van, Koster, K.
openaire +1 more source
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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Coalbed Methane: Conventional Rules for an Unconventional Resource
, 2004 Considering the evolution of coalbed methane development In North America, the authors highlight the risks involved at various stages of development.
Buckingham, Janice, Steele, Patricia
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Meitian dizhi yu kantanBackgroundNatural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high ...
Jiangnan TONG +7 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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Study on Interface Effect of Surfactant/Coal Composite System and Desorption Law of Methane
Zuanjingye yu wanjingyeTo address the key issue of surfactant-controlled coal wettability and desorption of methane in deep coalbed methane (CBM) development, coal-rock samples were taken from the Benxi Formation of the Erdos Basin to study the pattern of how surfactants ...
Pu YUAN +6 more
doaj +1 more source
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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