Volume 46 Issue 3
Jun.  2018
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HAO Zhiyong, YUE Lixin, SUN Keming, WANG Shuailing. Experiment study on the porosity and permeability of low permeability coal by supercritical CO2 temperature variation[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 64-71. DOI: 10.3969/j.issn.1001-1986.2018.03.012
Citation: HAO Zhiyong, YUE Lixin, SUN Keming, WANG Shuailing. Experiment study on the porosity and permeability of low permeability coal by supercritical CO2 temperature variation[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(3): 64-71. DOI: 10.3969/j.issn.1001-1986.2018.03.012
shu

Experiment study on the porosity and permeability of low permeability coal by supercritical CO2 temperature variation

  • 1. College of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, China;

  • 2. School of Mechanics & Engineering, Liaoning Technical University, Fuxin 123000, China

Funds: 

National Natural Science Foundation of China(51674133,51404135)

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  • Received Date: February 24, 2018
  • Published Date: June 24, 2018
    Graphical Abstract
    • Abstract
  • In order to solve the universal problem of low permeability and low gas recovery in China's high gassy seams, combining the strong diffusion, dissolution-enhancement and other unique advantages of super-critical carbon dioxide. The three axis penetration experimental device was self-made, the macro increasing permeability experiment of coal was carried out after the action of super-critical carbon dioxide with different temperatures, the microscopic scanning imaging experiment of coal was conducted based on macro increasing permeability experiment. The results show:after the action of super-critical carbon dioxide with constant volume stress, constant pore pressure and different temperatures, the permeability is increased by one order of magnitude than that before the increasing permeability experiment, but in the super-critical temperature range of carbon dioxide, the permeability of coal shows a negative exponential change with the increase of temperature. After the action of super-critical carbon dioxide, the micro porosity of coal increases by two orders of magnitude than that before the increasing permeability experiment, the evolution rate of micro pore-fissure slows down with the increase of temperature, the porosity presents a negative exponential changing law with the increasing temperature. The macro-micro experimental data also show that the macro-permeability of coal increases with the increase of micro-porosity. During the process of increasing permeability by the super-critical carbon dioxide, pore pressure plays the main control function in increasing the permeability of low permeability coal seam.
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    • References (19)
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