Results 51 to 60 of about 218,589 (182)
Meitian dizhi yu kantanBackgroundThe third submember of the second member of the Permian Shanxi Formation (also referred to as the Shan 23 submember) in the Daning-Jixian block along the eastern margin of the Ordos Basin is identified as a primary target layer for tight-sand ...
Lei ZHANG +9 more
doaj +1 more source
Study on the Law of Multi‐Fracture Propagation in Different Fracturing Fluid Viscosity
Energy Science &Engineering, Volume 14, Issue 3, Page 1339-1352, March 2026.Samples and equipment Sample preparation Test equipment Analysis of test results Fracture propagation morphology Influence of fracturing fluid viscosity on crack initiation time/(fracture initiation pressure) Evolution law of injection pressure Cumulative relation curve of pressure–time–acoustic ABSTRACT Using the TCHFSM‐I large‐scale accurate triaxial
Zhixing Zhang +4 more
wiley +1 more source
Safety Science and Technology, Volume 1, Issue 1, March 2026.Schematic diagram of a triaxial fluid–solid coupling device based on the mapping function. ABSTRACT In deep coal mining, the influence of temperature–pressure coupling on the mechanical properties of coal is a crucial factor inducing dynamic disasters.
Musen Gao, Heng Ma, Xiaoqi Wang, Ke Gao
wiley +1 more source
Optimization and application of sand bailing technology for coalbed methane horizontal wells
Meitian dizhi yu kantanObjective and Methods Coalbed methane (CBM) horizontal wells face challenges such as sand accumulation in completion strings, pipe wall scaling, and pump sticking, leading to declined CBM production or shutdown of these wells.
Fei ZHANG +10 more
doaj +1 more source
Research on the Mechanism of Sand Bridge Stuck Drill in Deep Coal and Rock Gas Horizontal Wells
Energy Science &Engineering, Volume 14, Issue 2, Page 854-865, February 2026.Accounting for wellbore collapse debris and the bulldozer effect, this study develops models for permeable and impermeable sand bridge sticking in deep CBM horizontal wells, deriving resistance and volume formulations. Validated in Changqing, results show impermeable bridges dominate; controls (fluid optimization, staged drilling, circulation, speed ...
Cheng Hui +7 more
wiley +1 more source
Isothermal Desorption Hysteretic Model for Deep Coalbed Methane Development
, 2022 The adsorption/desorption mechanism of coalbed methane is significant for gas control and coalbed methane exploitation; scholars have done a lot of research on it and generally have confidence in that temperature, pressure, and moisture are central ...
Feng Yang +3 more
core +1 more source
Methane migration characteristics of the Pocahontas No. 3 coalbed [PDF]
"Methane-flow and pressure data taken from a mine in the Pocahontas No. 3 Coalbed are compared with flow rates from lump coal obtained in laboratory experiments.
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The composition of coalbed gas [PDF]
"Samples of gas were obtained directly from the coalbed during drilling of horizontal and vertical boreholes in six different formations. The samples were analyzed by gas chromatography for C1 to C5 hydrocarbons and for 02, N2, H2, He, and CO2.
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EnergiesTo address interlayer interference during multi-layer commingled production in gas reservoirs with pressure differences, this study investigates the low-permeability gas reservoir in the central Linxing area of the Ordos Basin.
Yu Su +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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