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Numerical and experimental studies on dynamic gas emission characteristics of boreholes
- Source :
- PLoS ONE, Vol 16, Iss 5, p e0251209 (2021), PLoS ONE
- Publication Year :
- 2021
- Publisher :
- Public Library of Science (PLoS), 2021.
-
Abstract
- The gas emission rate of boreholes is one of the most important indices for coal and gas outburst prediction. In this work, instantaneous gas emission velocity and environmental effects on borehole gas emission were studied. Through theoretical analysis, the mechanism of crack propagation in the coal borehole was clarified, and the effect of soft and hard coal on gas desorption and gas emission. The results of numerical simulations also indicated that the initial gas emission has a function relationship to the drilling distance and the physical characteristics of the coal seam. A novel dynamic testing technology was proposed to obtain gas emission velocity. Laboratory experiments under adsorption and desorption of CO2 and N2 were performed using coal samples from Xuehu, Fenghui, Weishe, and Wuzhong coal mines. The data of initial gas emission under different coal samples were recorded, and the fitting curves were obtained. The results show a positive correlation between initial gas emission and drilling depth. However, abnormal would occur when the drill pipe enters the soft stratification, and the maximum value of the initial gas emission of the abnormal part is 3.8 times the normal value, which indicates a high degree of sensibility to soft stratification. The results were revealed the dynamic gas emission law of boreholes.
- Subjects :
- Fossil Fuels
010501 environmental sciences
010502 geochemistry & geophysics
01 natural sciences
Physical Chemistry
Methane
chemistry.chemical_compound
Fluid dynamics
Materials
Physics::Atmospheric and Oceanic Physics
Peak Values
Multidisciplinary
Physics
Classical Mechanics
Permeability (earth sciences)
Chemistry
Coal
Physical Sciences
Engineering and Technology
Sorption
Medicine
Organic Materials
Research Article
Astrophysics::High Energy Astrophysical Phenomena
Science
Materials Science
Material Properties
Borehole
Mineralogy
Drill pipe
Fluid Mechanics
Fuels
Continuum Mechanics
Permeability
otorhinolaryngologic diseases
Computer Simulation
Fluid Flow
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
business.industry
Coal mining
Chemical Compounds
Drilling
Fluid Dynamics
Models, Theoretical
Coal Mining
Energy and Power
chemistry
Signal Processing
Environmental science
Desorption
Adsorption
business
Subjects
Details
- Language :
- English
- ISSN :
- 19326203
- Volume :
- 16
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- PLoS ONE
- Accession number :
- edsair.doi.dedup.....93da8a474d4662b4582717a37a3ca530