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Permeability Evolution of Bituminous Coal and Its Dynamic Control, a Case Study from the Southeastern Ordos Basin, China

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  • Yongkai Qiu

    (Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China)

  • Dingjun Chang

    (School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, China)

  • Fengrui Sun

    (Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China)

  • Abulaitijiang Abuduerxiti

    (Fengcheng Oilfield Operation District, Xinjiang Oilfield Company, CNPC, Karamay 834000, China)

  • Yidong Cai

    (Coal Reservoir Laboratory of National Engineering Research Center of CBM Development & Utilization, School of Energy Resource, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract

Coalbed methane (CBM) reservoirs’ permeability is the result of dynamic variations influenced by tectonics, hydrology and the CBM production process. Taking samples from the southeastern Ordos Basin, China, the permeability evolution of bituminous coal and its control were analyzed in three steps: (1) the coal fracture permeability evolution was acquired via X-ray CT scanning and permeability evolution experiments; (2) the permeability variation was determined while considering the coupling characteristics effective stress, gas slippage, and matrix shrinkage effect and its influencing factors; and (3) a dynamic permeability model was built while considering those effects. For samples in which neither fractures nor bedding developed, the permeability decreased first and then increased as the gas pressure increased. For samples with fractures that developed parallel to the axial direction, with a gradual increase in gas pressure, the permeability also increased. As the gas pressure decreased, the matrix shrinkage effect became positive, resulting in a permeability increase. The gas slippage effect was positive in the low-pressure stage, which also resulted in a permeability increase.

Suggested Citation

  • Yongkai Qiu & Dingjun Chang & Fengrui Sun & Abulaitijiang Abuduerxiti & Yidong Cai, 2023. "Permeability Evolution of Bituminous Coal and Its Dynamic Control, a Case Study from the Southeastern Ordos Basin, China," Energies, MDPI, vol. 16(24), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:24:p:8046-:d:1299525
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    References listed on IDEAS

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