The influence of gas storage parameters on gas emission rate from borehole
| Autor: | Jian-liang Gao, Bin Shang |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Petroleum engineering
business.industry Public Health Environmental and Occupational Health Borehole Finite difference method Coal mining Environmental engineering Poison control Separator (oil production) Physics::Geophysics Environmental science Coal Wet gas Boundary value problem Safety Risk Reliability and Quality business Safety Research Astrophysics::Galaxy Astrophysics |
| Zdroj: | Safety Science. 50:869-872 |
| ISSN: | 0925-7535 |
| DOI: | 10.1016/j.ssci.2011.08.016 |
| Popis: | Gas emission rate from borehole is one of the most important indexes for the coal and gas outburst prediction. The mathematical model of gas flow in the coal seam, gas flow into the measuring chamber, gas pressure change in the measuring chamber, and gas flow out of the chamber through the pipe is established. Gas migration in the coal seam, gas pressure in borehole chamber and gas flow in pipe is simulated using the finite difference method. Gas emission rate is obtained under dynamic boundary conditions. The influence of gas storage parameters on gas emission rate from borehole is analyzed. Results show that: the gas pressure and the permeability coefficient have great impacts on the value of gas flow quantity in borehole. The larger the original gas pressure of coal seam and the permeability coefficient of coal seam are, the greater the maximum value of gas emission rate form borehole and the later the maximum appears. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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