Volume 53 Issue 4
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Abstract
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GAO Mingzhong，SONG Jie，CUI Pengfei，et al. Evolutionary pattern and a calculation method of in situ gas pressure based on pressure-retaining coal cores[J]. Coal Geology & Exploration，2025，53(4)：1−11. DOI: 10.12363/issn.1001-1986.24.09.0613
Citation: GAO Mingzhong，SONG Jie，CUI Pengfei，et al. Evolutionary pattern and a calculation method of in situ gas pressure based on pressure-retaining coal cores[J]. Coal Geology & Exploration，2025，53(4)：1−11. DOI: 10.12363/issn.1001-1986.24.09.0613
shu

Evolutionary pattern and a calculation method of in situ gas pressure based on pressure-retaining coal cores

  • 1.

    State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Shenzhen University, Shenzhen 518060, China

  • 2.

    Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen 518060, China

  • 3.

    College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China

  • 5.

    State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Sichuan University, Chengdu 610065, China

  • 4.

    State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, Sichuan University, Chengdu 610065, China

  • 6.

    China Construction First Group the Fifth Construction Co., Ltd., Beijing 100024, China

More Information
  • Received Date: October 07, 2024
  • Revised Date: March 11, 2025
  • Accepted Date: April 24, 2025
    Graphical Abstract
    • Abstract
  • Objective and Methods 

    The in situ gas pressure of coal seams represents a crucial parameter for the safe production of coal mines and the assessment of coalbed methane (CBM) resources. To overcome current limitations in determining the in situ gas pressure, such as prolonged measurement cycles and the influence of multiple parameters on the measurement results, this study conducted isothermal adsorption and volumetric expansion desorption experiments on pressure-retaining coal cores with varying moisture contents using a self-constructed experimental system for gas pressure evolution in pressure-retaining coal cores. As a result, the evolutionary pattern of gas pressure in pressure-retaining coal cores was determined. Accordingly, following the theoretical calculation principle of in situ gas pressure in coal seams, formed by the in situ pressure- and gas-retaining coring process for deep coal seams, this study proposed a correction model for gas pressure calculation that considered moisture content and verified its reliability.

    Results and Conclusions 

    The results indicate that: (1) Influenced by high gas pressure, the gas pressure within the pressure-preserved space more easily reaches a new equilibrium. During the isothermal adsorption process, the gas pressure exhibits a staged evolution characteristic, where the gas pressure in the pressure-preserved coal core first rapidly decreases to a certain value, then increases before gradually stabilizing. (2) Due to the pore characteristics of the coal sample being dominated by mesopores and having a large micropore volume, in the isothermal adsorption experiments of pressure-preserved coal cores with different moisture contents, the higher the moisture content, the longer the equilibrium time and the lower the adsorption pressure drop. (3) The gas pressure of the coal samples was calculated based on the expansion desorption experiments of pressure-preserved coal cores with different moisture contents. The average relative errors of the gas pressure calculation results under various moisture contents were 2.22%, 1.29%, 0.39%, and 0.80%, respectively. The corrected gas pressure calculation method demonstrated high accuracy across all moisture contents. Ensuring reliable calculation accuracy, the use of equilibrium gas pressure within the pressure-preserved space to calculate in-situ coalbed gas pressure is expected to provide a reliable and convenient calculation method for the determination of in-situ coalbed gas pressure.

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