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The Influence of Movable Water on the Gas-Phase Threshold Pressure Gradient in Tight Gas Reservoirs

Author

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  • Weiyao Zhu

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Guodong Zou

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Yuwei Liu

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Wenchao Liu

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

  • Bin Pan

    (School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)

Abstract

Threshold pressure gradient (TPG) is a key parameter determining the pore-scale fluid dynamics. In tight gas reservoirs, both gas and water exist in the porous rock, and the existing water can be divided into irreducible and movable water. However, how movable water saturation will influence TPG has not yet been investigated. Therefore herein, nuclear magnetic resonance (NMR) and high-pressure mercury intrusion (HPMI) experiments were performed to determine pore-scale water distribution, movable water saturation, and pore throat distribution in the core plugs. Subsequently, the air bubble method was used to measure TPG as a function of movable water saturation and permeability inside tight gas core plugs, finding that TPG increased from 0.01 MPa/m to 0.25 MPa/m with the movable saturation increased from 2% to 35%. Finally, a semi-empirical model was derived to describe the correlation between TPG, movable water saturation, and permeability, which performed better than previous models in the literature. These insights will advance the fundamental understanding of TPG in tight gas reservoirs and provide useful guidance on tight gas reservoirs development.

Suggested Citation

  • Weiyao Zhu & Guodong Zou & Yuwei Liu & Wenchao Liu & Bin Pan, 2022. "The Influence of Movable Water on the Gas-Phase Threshold Pressure Gradient in Tight Gas Reservoirs," Energies, MDPI, vol. 15(14), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:14:p:5309-:d:868571
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    References listed on IDEAS

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    1. Jie Zhang & Xizhe Li & Weijun Shen & Shusheng Gao & Huaxun Liu & Liyou Ye & Feifei Fang, 2020. "Study of the Effect of Movable Water Saturation on Gas Production in Tight Sandstone Gas Reservoirs," Energies, MDPI, vol. 13(18), pages 1-14, September.
    2. Yong Wang & Yunqian Long & Yeheng Sun & Shiming Zhang & Fuquan Song & Xiaohong Wang, 2019. "Threshold Pore Pressure Gradients in Water-Bearing Tight Sandstone Gas Reservoirs," Energies, MDPI, vol. 12(23), pages 1-13, December.
    3. J. David Hughes, 2013. "A reality check on the shale revolution," Nature, Nature, vol. 494(7437), pages 307-308, February.
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    Cited by:

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    2. Tongjing Liu & Liwu Jiang & Jinju Liu & Juan Ni & Xinju Liu & Pengxiang Diwu, 2022. "A Novel Workflow for Early Time Transient Pressure Data Interpretation in Tight Oil Reservoirs with Physical Constraints," Energies, MDPI, vol. 16(1), pages 1-15, December.

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