Science & Technology Review >

2015 , Vol. 33 >Issue 17: 84 - 89

DOI: https://doi.org/10.3981/j.issn.1000-7857.2015.17.009

Articles

Experimental study on coal-bed methane displacement by carbon dioxide injection

  • WANG Jin ,
  • WANG Yanbin ,
  • FAN Jingjing ,
  • LIU Chenglong ,
  • XUE Pei
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  • College of Geoscience and Surveying Engineering, China University of Mining&Technology, Beijing 100083, China

Received date: 2015-03-30

  Revised date: 2015-06-11

  Online published: 2015-09-12

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Abstract

This study used the cylinder raw coal samples from Tunliu coal mine and Sihe coal mine to carry out the displacement of CH4 with CO2 experiment under the different injection pressures. Analyzed the gas adsorption characteristics in the experiment and the influence of injection pressures on the replacement of with CO2, and proposed that replacement effect was better at low pore pressure. The results are as follows. Adsorption capacity of CO2 is stronger than that of CH4 under the same condition in the process of displacement; CH4 volume ratio decreases with injection pressure decreasing, while CO2 volume ratio shows the opposite trend; When the confining pressure is 8 MPa, the CH4 output ratio reduces with linear relation and the replacement ratio of CO2 reduces with exponential relation as injection pressure increases, and indicating that the replacement is better at low injection pressure in this displacement experimental; The replacement effect of meager lean coal sample is better than anthracite under the same conditions in this experimental.

Key words： CO2; CH4; replacement; output ratio; replacement ratio

Cite this article

WANG Jin , WANG Yanbin , FAN Jingjing , LIU Chenglong , XUE Pei . Experimental study on coal-bed methane displacement by carbon dioxide injection[J]. Science & Technology Review, 2015 , 33(17) : 84 -89 . DOI: 10.3981/j.issn.1000-7857.2015.17.009

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