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Natural Gas Exploration and Development >

2024 , Vol. 47 >Issue 2: 97 - 103

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2024.02.012

UNCONVENTIONAL OIL AND GAS

Influence of intermediate principal stress on seepage behaviors and slippage effect in shale gas

  • FAN Xiangyu ,
  • ZHANG Xinyu ,
  • HU Xiaoyuan ,
  • JIANG Changbao ,
  • ZHANG Qiangui ,
  • ZHAO Pengfei ,
  • CHEN Yufei
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  • 1. School of Geosciences and Technology, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. Chongqing Chuandongnan Survey and Design Institute Co., Ltd., Chongqing 400030, China;
    4. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;
    5. School of Petroleum Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China

Revised date: 2024-03-01

  Online published: 2024-04-28

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Abstract

Seepage behaviors in shale gas affect the recovery significantly. However, previous studies on the seepage are often done under different confining pressure, and studied findings fail to reveal the intermediate principal stress affecting permeability. So, by employing a self-developed true tri-axial liquid-solid coupling system with multiple functions, many coupling experiments were conducted on the cubic samples from shale outcrop of the Silurian Longmaxi Formation, Fuling shale gas block. Moreover, matching with the Klinkenberg equation, experimental data were adopted to analyze how different intermediate principal stress impacts on both seepage behaviors and slippage effect. Results show that (i) this principal stress has a little influence on permeability evolution at smaller deviatoric stress, while an incremental effect along with the increasing deviatoric stress cannot be ignored; (ii) after fitting the relation of slippage factor to inherent permeability with experimental data, a better correlation is found, which can be used to predict this factor for shale in the same block; and (iii) when the deviatoric stress is less than or equal to 35 MPa, the slippage contribution is above 65%, indicating that the slippage effect dominates gas seepage in shale.

Key words： Intermediate principal stress; Seepage behaviors in shale gas; True triaxial; Slippage Contribution; Deviatoric stress

Cite this article

FAN Xiangyu , ZHANG Xinyu , HU Xiaoyuan , JIANG Changbao , ZHANG Qiangui , ZHAO Pengfei , CHEN Yufei . Influence of intermediate principal stress on seepage behaviors and slippage effect in shale gas[J]. Natural Gas Exploration and Development, 2024 , 47(2) : 97 -103 . DOI: 10.12055/gaskk.issn.1673-3177.2024.02.012

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