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• W3014223359 endingPage "117698" @default.
• W3014223359 startingPage "117698" @default.
• W3014223359 abstract "Adsorption swelling and desorption shrinkage inside a coalbed affect coal porosity, permeability, stress state and thus the production of coalbed methane, degasification of high gassy coal seam and CO2 enhanced coalbed methane recovery. Since coal P-wave velocity is sensitive to porosity variation, using P-wave velocity to monitor the porosity/permeability behavior inside the coalbed will be helpful. To realize this idea, laboratory characterization of P-wave velocity variation with gas pressure is needed. In this paper, a tri-axial experimental system combined with an ultrasonic instrument are used to measure P-wave velocity and adsorption swelling of bituminous coal. Helium and methane are used to study the effect of effective stress and adsorption swelling on P-wave velocity, respectively. Experiment results show that both effective stress and adsorption swelling affect the P-wave velocity mainly by changing the porosity of coal sample. The calculation model derived from the Palmer and Mansoori permeability model, the Shi and Durucan permeability model and velocity-porosity model shows high consistency with measurement results. Effective stress effect and adsorption swelling effect is evaluated under constant confining pressure condition. Experiment results show that the dominant factor that affects the P-wave velocity varies with confining pressure and pore pressure. Adsorption swelling effect is dominant with a combination of high confining pressure and low pore pressure, and it will leads to a rebound of P-wave velocity curve if the confining pressure is high enough. Furthermore, this rebound matches the conclusion of P&M permeability model that permeability rebound only appears at low porosity." @default.
• W3014223359 created "2020-04-10" @default.
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• W3014223359 date "2020-07-01" @default.
• W3014223359 modified "2023-10-02" @default.
• W3014223359 title "Laboratory characterization of coal P-wave velocity variation during adsorption of methane under tri-axial stress condition" @default.
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• W3014223359 doi "https://doi.org/10.1016/j.fuel.2020.117698" @default.
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