Volume 47 Issue 1
Feb.  2019
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LI Xijian, YIN Xin, LI Weiwei, LIU Shangping, ZHANG Pei. Surface free energy of shale gas in Niutitang Formation in Guizhou Province[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(1): 101-106. DOI: 10.3969/j.issn.1001-1986.2019.01.015
Citation: LI Xijian, YIN Xin, LI Weiwei, LIU Shangping, ZHANG Pei. Surface free energy of shale gas in Niutitang Formation in Guizhou Province[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(1): 101-106. DOI: 10.3969/j.issn.1001-1986.2019.01.015
shu

Surface free energy of shale gas in Niutitang Formation in Guizhou Province

  • 1. Mining College, Guizhou University, Guiyang 550025, China;

  • 2. Engineering Center for Safe Mining Technology under Complex Geologic Condition, Guiyang 550025, China;

  • 3. Institute of Gas Disaster Prevention and Coalbed Methane Development of Guizhou University, Guiyang 550025, China

Funds: 

Major Application of Basic Research Projects in Guizhou Province(Qian Kehe JZ Zi[2014]2005)

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  • Received Date: January 18, 2018
  • Published Date: February 24, 2019
    Graphical Abstract
    • Abstract
  • In order to study the adsorption mechanism of shale for gas, the isothermal adsorption experiments on shale samples from wells Fengcan 1 and Tianma 1 in Guizhou Province were carried out at 50℃, 60℃, 80℃, and the isothermal adsorption curves of CH4 and CO2 were plotted, the shale surface free energy was calculated and the adsorption characteristics of CH4 and CO2 from shale were analyzed by the surface free energy. The results show that when the temperature is constant, the surface free energy of shale gas increases with the increase of pressure, and the change of surface free energy of two gases shows an increasing trend. When the pressure is constant, the surface free energy decreases with the increase of temperature, which is consistent with the change of gas adsorption on the isothermal adsorption curve. The surface free energy of CO2 is higher than that of CH4 in shale. The surface free energy of shale to CO2 is greater than CH4, indicating that shale adsorption capacity for CO2 is stronger than CH4, and the rate of recovery can increase by injecting CO2 into shale layers. For shale gas reservoirs with strong adsorption capacity, surfactants can be injected to enhance the binding capacity of shale surface and to reduce CH4 surface area and shale surface free energy, so as to achieve the purpose of CH4 desorption.
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