Results 61 to 70 of about 218,589 (182)
The disaster law and control measures of high-stress tunnels in fault areas: a case study
Scientific ReportsIn recent years, the frequent occurrence of dynamic disasters in tunnels with high stress in fault areas has greatly threatened engineering safety. The typical case – a tunnel influenced by fault slip on is taken as a research object.
Wenjie Li +7 more
doaj +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 ...
core
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
core +1 more source
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
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
core
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 ...
core
Uncertainty Analysis Method for Rib Force Vector Control of Coiled Tubing Drilling Orientor
Shiyou jixieIn the process of coiled tubing （CT） directional drilling， the downhole parameters have some uncertainties. To more accurately control the wellbore trajectory to advance along the planned course， an uncertainty analysis method for rib force vector ...
Wang Wei +6 more
doaj +1 more source
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 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
core
Coalbed methane in Wyoming (second revision)
, 2004 Coalbed methane in Wyoming (second ...
R.M. Lyman (10071331) +3 more
core +1 more source