Experiment on Improving the Permeability of Coal Reservoir under Ultrasound
Received date: 2013-06-05
Revised date: 2014-01-27
Online published: 2014-05-10
In order to reveal the effect of the ultrasound on the permeability of coal rock,the principle of permeability of coal rock is expounded,and the permeability test of coal samples under the ultrasound was carried out.The measured data without ultrasound and with the ultrasound under different power are analyzed comparatively.Meanwhile,the loading of the ultrasound promotes the seepage of CH4 in the coal rock,and increases the permeability of coal samples;moreover,as the power of the ultrasound becomes stronger,the increase rate of permeability of coal samples becomes greater.On this basis,permeability relationship model of the coal rock under different confining pressure and power is calculated and fitted according to the relationship of the power of the ultrasonic wave and the flow ratio of the gas.Through the analysis of the experimental results,the principle of the ultrasound in enhancing the permeability of coalbed methane is discussed in detail.
Key words： Coalbed methane; Ultrasound; Permeability
ZHAO Li-juan,QIN Yong . Experiment on Improving the Permeability of Coal Reservoir under Ultrasound[J]. Natural Gas Geoscience, 2014 , 25(5) : 747 -752 . DOI: 10.11764/j.issn.1672-1926.2014.05.747
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