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
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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 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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Research on Wellbore Quality Control Technology for Coalbed Methane Deviated Wells [PDF]
, 2014 Deviated well is one of the main well types to develop coalbed methane in China. It's been widely used by various coalbed methane companies in recent years.
Shichao, Li, Zhixin, Mao, Baoshan, Zhao
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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
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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
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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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Design of nonlinear sliding mode controller for hydraulic fracturing of coalbed methane [PDF]
, 2016 For coordination and synchronous control problem of multi motors of water pump for hydraulic fracturing in coalbed methane exploit process, a method of nonlinear sliding mode control was proposed, design method of nonlinear sliding mode controller for ...
LI Feng, MA Tiehua, YAO Shuncai
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Gas drainage and utilization in coal mines in China: History, technological advances, and prospects
Meitian dizhi yu kantanObjective and Methods To promote the research and application of gas drainage and utilization technologies for coal mines, this study systematically summarizes the history of China’s coal mines transitioning from gas pumping to gas drainage, the accurate
Guofu LI +5 more
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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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