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LIU Yanjie, LIU Chao, MA Bing, GUO Jing. Acidification experiment for enhancing the permeability of coal reservoir[J]. COAL GEOLOGY & EXPLORATION, 2016, 44(2): 46-49. DOI: 10.3969/j.issn.1001-1986.2016.02.009
Citation: LIU Yanjie, LIU Chao, MA Bing, GUO Jing. Acidification experiment for enhancing the permeability of coal reservoir[J]. COAL GEOLOGY & EXPLORATION, 2016, 44(2): 46-49. DOI: 10.3969/j.issn.1001-1986.2016.02.009
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Acidification experiment for enhancing the permeability of coal reservoir

  • 1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;

  • 2. Oil & Gas Technology Research Institute of PetroChina Changqing Oilfield Company, Xi'an 710018, China;

  • 3. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Xi'an 710018, China

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  • Received Date: March 18, 2015
  • Available Online: October 22, 2021
    Graphical Abstract
    • Abstract
  • In order to study the influence of acidification on the permeability of coal reservoir,indoor acidification experiment was carried out. Coal samples with developed fractures in NO.3 coal seam of Jincheng area of Qinshui basin in Shanxi Province were adopted. The coal samples were made into dry pulverized coal of 60-80 mesh and coal cores of 50 mm in diameter, then the pulverized coal and coal cores were processed with different acids. The dissolution rate after acidification of the pulverized coal, the permeability and the porosity before and after acidification of the coal cores were measured. The results indicated that after acidification the permeability of the coal cores increased from about 0.5×10-3 μm2 to 3.0×10-3μm2 and the porosity increased about 5.5%. Acidification of coal core could greatly improve its permeability. The research results provide an experimental support for the application of coalbed methane acidification operation.
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