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Online Nuclear Magnetic Resonance Analysis of the Effect of Stress Changes on the Porosity and Permeability of Shale Oil Reservoirs

Author

Listed:
  • Lanlan Yao

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 101400, China
    Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China)

  • Qihong Lei

    (Shaanxi Yanchang Petroleum (China), Xi’an 710016, China)

  • Zhengming Yang

    (Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
    China Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Youan He

    (Shaanxi Yanchang Petroleum (China), Xi’an 710016, China)

  • Haibo Li

    (Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
    China Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Guoxi Zhao

    (Shaanxi Yanchang Petroleum (China), Xi’an 710016, China)

  • Zigang Zheng

    (Shaanxi Yanchang Petroleum (China), Xi’an 710016, China)

  • Haitao Hou

    (Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China
    China Petroleum Exploration and Development Research Institute, Beijing 100083, China)

  • Meng Du

    (College of Engineering Science, University of Chinese Academy of Sciences, Beijing 101400, China
    Institute of Porous Flow and Fluid Mechanics, Langfang 065007, China)

  • Liangbing Cheng

    (Shaanxi Yanchang Petroleum (China), Xi’an 710016, China)

Abstract

In the process of volumetric fracturing of shale oil, physical property changes caused by stress changes will affect the recovery, so it is urgent to conduct an analysis and evaluation of physical property changes caused by stress changes. In this research, a physical simulation experiment with constant confining pressure and variable pore pressure combined with an online nuclear magnetic resonance (NMR) technique was constructed. The results show that the increased range of the macropore (IRM) and the total pore (IRT) of matrix samples is 11.70~13.24% and 10.54~14.27% with the increase of pore pressure, respectively. That of fractured samples are 7.94~8.48% and 9.21~10.51%. It indicates that increasing pore pressure is more effective for matrix reservoirs. The decreased range of the macropore (DRM) and the total pore (DRT) of matrix samples is 10.29~13.89% and 10.38~21.24% with the unloading of pore pressure, respectively. That of fractured samples are 8.49~9.66% and 10.91~11.10%. It indicates that unloading pressure has less influence on fractured reservoirs. The increased range of permeability of matrix rock samples is 99~120% with the increase of pore pressure. Greatly supplementing formation energy is an effective means to improve the permeability of matrix reservoirs. Compared with matrix reservoirs, unloading pore pressure is more damaging to fractured reservoirs.

Suggested Citation

  • Lanlan Yao & Qihong Lei & Zhengming Yang & Youan He & Haibo Li & Guoxi Zhao & Zigang Zheng & Haitao Hou & Meng Du & Liangbing Cheng, 2023. "Online Nuclear Magnetic Resonance Analysis of the Effect of Stress Changes on the Porosity and Permeability of Shale Oil Reservoirs," Energies, MDPI, vol. 16(3), pages 1-17, January.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:3:p:1139-:d:1041899
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    References listed on IDEAS

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    1. Weichao Yan & Fujing Sun & Jianmeng Sun & Naser Golsanami, 2021. "Distribution Model of Fluid Components and Quantitative Calculation of Movable Oil in Inter-Salt Shale Using 2D NMR," Energies, MDPI, vol. 14(9), pages 1-17, April.
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