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Study on Apparent Permeability Model for Gas Transport in Shale Inorganic Nanopores

Author

Listed:
  • Shuda Zhao

    (GGPE, Missouri University of Science and Technology, Rolla, MO 65401, USA)

  • Hongji Liu

    (Key Laboratory of Theory and Technology of Petroleum Exploration and Development, China University of Geosciences, Wuhan 430074, China)

  • Enyuan Jiang

    (China National Oil and Gas Exploration and Development Co. Ltd., (CNOOC), Beijing 100034, China)

  • Nan Zhao

    (SINOPEC Henan Oilfield Company, Nanyang 473132, China)

  • Chaohua Guo

    (Key Laboratory of Theory and Technology of Petroleum Exploration and Development, China University of Geosciences, Wuhan 430074, China)

  • Baojun Bai

    (GGPE, Missouri University of Science and Technology, Rolla, MO 65401, USA)

Abstract

Inorganic nanopores occurring in the shale matrix have strong hydrophilicity and irreducible water (IW) film can be formed on the inner surface of the pores making gas flow mechanisms in the pores more complex. In this paper, the existence of irreducible water (IW) in inorganic pores is considered, and, based on the Knudsen number ( K n ) correction in shale pores, a shale gas apparent permeability model of inorganic nano-pores is established. The effect of the K n correction on the apparent permeability, the ratio of flow with pore radius and the effect of IW on the apparent permeability are assessed. The main conclusions are as follows: (1) at low pressure (less than 10 MPa) and for medium pore size (pore radius range of 10 nm–60 nm), the effect of the K n correction should be considered; (2) considering the effect of the K n correction, bulk phase transport replaces surface diffusion more slowly; considering the existence of IW, bulk phase transport replaces surface diffusion more slowly; (3) with increase in pressure, the IW effect on gas apparent permeability decreases. Under low pressure, the IW, where pore size is small, promotes fluid flow, while the IW in the large pores hinders fluid flow. In conditions of ultra-high pressure, the IW promotes gas flow.

Suggested Citation

  • Shuda Zhao & Hongji Liu & Enyuan Jiang & Nan Zhao & Chaohua Guo & Baojun Bai, 2022. "Study on Apparent Permeability Model for Gas Transport in Shale Inorganic Nanopores," Energies, MDPI, vol. 15(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6301-:d:900776
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    References listed on IDEAS

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    1. Gong, Jianming & Qiu, Zhen & Zou, Caineng & Wang, Hongyan & Shi, Zhensheng, 2020. "An integrated assessment system for shale gas resources associated with graptolites and its application," Applied Energy, Elsevier, vol. 262(C).
    2. Xiao, Zumian & Gao, Juanhe & Wang, Zongshu & Yin, Zhichao & Xiang, Lijin, 2022. "Power shortage and firm productivity: Evidence from the World Bank Enterprise Survey," Energy, Elsevier, vol. 247(C).
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    Cited by:

    1. Daoyi Zhu, 2023. "New Advances in Oil, Gas, and Geothermal Reservoirs," Energies, MDPI, vol. 16(1), pages 1-4, January.

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