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Research on Stress Sensitivity of Fractured Carbonate Reservoirs Based on CT Technology

Author

Listed:
  • Yongfei Yang

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Zhihui Liu

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Zhixue Sun

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Senyou An

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Wenjie Zhang

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Pengfei Liu

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Jun Yao

    (Research Centre of Multiphase Flow in Porous Media, China University of Petroleum (East China), Qingdao 266580, China)

  • Jingsheng Ma

    (Institute of Petroleum Engineering, Heriot-Watt University, Riccarton, Edinburgh EH14 4AS, UK)

Abstract

Fracture aperture change under stress has long been considered as one of primary causes of stress sensitivity of fractured gas reservoirs. However, little is known about the evolution of the morphology of fracture apertures on flow property in loading and unloading cycles. This paper reports a stress sensitivity experiment on carbonate core plugs in which Computed Tomography (CT) technology is applied to visualize and quantitatively evaluate morphological changes to the fracture aperture with respect to confining pressure. Fracture models were obtained at selected confining pressures on which pore-scale flow simulations were performed to estimate the equivalent absolute permeability. The results showed that with the increase of confining pressure from 0 to 0.6 MPa, the fracture aperture and equivalent permeability decreased at a greater gradient than their counterparts after 0.6 MPa. This meant that the rock sample is more stress-sensitive at low effective stress than at high effective stress. On the loading path, an exponential fitting was found to fit well between the effective confining pressure and the calculated permeability. On the unloading path, the relationship is found partially reversible, which can evidently be attributed to plastic deformation of the fracture as observed in CT images.

Suggested Citation

  • Yongfei Yang & Zhihui Liu & Zhixue Sun & Senyou An & Wenjie Zhang & Pengfei Liu & Jun Yao & Jingsheng Ma, 2017. "Research on Stress Sensitivity of Fractured Carbonate Reservoirs Based on CT Technology," Energies, MDPI, vol. 10(11), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1833-:d:118376
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    Citations

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    Cited by:

    1. Liming Zhang & Zekun Deng & Kai Zhang & Tao Long & Joshua Kwesi Desbordes & Hai Sun & Yongfei Yang, 2019. "Well-Placement Optimization in an Enhanced Geothermal System Based on the Fracture Continuum Method and 0-1 Programming," Energies, MDPI, vol. 12(4), pages 1-20, February.
    2. Ali Shafiei & Maurice B. Dusseault & Ehsan Kosari & Morteza N. Taleghani, 2018. "Natural Fractures Characterization and In Situ Stresses Inference in a Carbonate Reservoir—An Integrated Approach," Energies, MDPI, vol. 11(2), pages 1-26, February.
    3. Haiyuan Yang & Li Zhang & Ronghe Liu & Xianli Wen & Yongfei Yang & Lei Zhang & Kai Zhang & Roohollah Askari, 2019. "Thermal Conduction Simulation Based on Reconstructed Digital Rocks with Respect to Fractures," Energies, MDPI, vol. 12(14), pages 1-13, July.
    4. Kevin J. Hodder & Angel J. Sanchez-Barra & Sergey Ishutov & Gonzalo Zambrano-Narvaez & Rick J. Chalaturnyk, 2022. "Increasing Density of 3D-Printed Sandstone through Compaction," Energies, MDPI, vol. 15(5), pages 1-15, March.
    5. Yi Feng & Gao Li & Yingfeng Meng & Boyun Guo, 2018. "A Novel Approach to Investigating Transport of Lost Circulation Materials in Rough Fracture," Energies, MDPI, vol. 11(10), pages 1-19, September.
    6. Evgenii Vasilevich Kozhevnikov & Mikhail Sergeevich Turbakov & Evgenii Pavlovich Riabokon & Vladimir Valerevich Poplygin, 2021. "Effect of Effective Pressure on the Permeability of Rocks Based on Well Testing Results," Energies, MDPI, vol. 14(8), pages 1-20, April.
    7. Wanniarachchige Gnamani Pabasara Kumari & Pathegama Gamage Ranjith, 2022. "Experimental and Numerical Investigation of the Flow Behaviour of Fractured Granite under Extreme Temperature and Pressure Conditions," Sustainability, MDPI, vol. 14(14), pages 1-19, July.
    8. Yongfei Yang & Zhihui Liu & Jun Yao & Lei Zhang & Jingsheng Ma & S. Hossein Hejazi & Linda Luquot & Toussaint Dono Ngarta, 2018. "Flow Simulation of Artificially Induced Microfractures Using Digital Rock and Lattice Boltzmann Methods," Energies, MDPI, vol. 11(8), pages 1-17, August.
    9. Qinwen Zhang & Liehui Zhang & Qiguo Liu & Youshi Jiang, 2020. "Pressure Performance of Highly Deviated Well in Low Permeability Carbonate Gas Reservoir Using a Composite Model," Energies, MDPI, vol. 13(22), pages 1-19, November.

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