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The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet

Author

Listed:
  • Mukun Li
  • Hongjian Ni
  • Ruihe Wang
  • Weiqiang Song

Abstract

The supercritical carbon dioxide (SC†CO2) jet is a new†type of rock†breaking method that effectively combines pressure impact and thermal shock. Current studies show that a carbon dioxide jet produces a larger damaged area and requires a lower threshold pressure for rock breaking compared to a water jet; however, the rock†breaking mechanism of the SC†CO2 jet has not been clearly explained. This study developed a heat†fluid†solid coupling model using ANSYS. The simulation and experimental results show good agreement, clearly explaining the effect of thermal stress in the rock breaking of the SC†CO2 jet. The study shows that the temperature field of the SC†CO2 jet could result in an increase in the maximum stress and the high†stress area. The thermal gradient between the rock surface and the internal parts decreases with jet time, further contributing to lower rock stress. When jet temperature and jet pressure differences at the entrance/exit increase, the jet temperature field contributes more to the increase in rock stress. For hard rocks with a higher elastic modulus, the thermal gradient can reduce the depth of high stress in the rock's interior and lead to greater stress on the rock surface. The study provides a basis for employing the SC†CO2 technique in well drilling and in fracturing for shale gas exploitation. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Mukun Li & Hongjian Ni & Ruihe Wang & Weiqiang Song, 2018. "The effect of thermal stresses on the relation between rock failure and temperature and pressure of supercritical carbon dioxide jet," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(2), pages 218-237, April.
  • Handle: RePEc:wly:greenh:v:8:y:2018:i:2:p:218-237
    DOI: 10.1002/ghg.1762
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    References listed on IDEAS

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    1. Zhiyuan Wang & Baojiang Sun & Xiaohui Sun & Huazhou Li & Jintang Wang, 2016. "Phase state variations for supercritical carbon dioxide drilling," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(1), pages 83-93, February.
    2. Teng Lu & Zhaomin Li & Weiyu Fan & Songyan Li, 2016. "CO 2 huff and puff for heavy oil recovery after primary production," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(2), pages 288-301, April.
    3. Weiqiang Song & Hongjian Ni & Ruihe Wang & Mengyun Zhao, 2017. "Wellbore flow field of coiled tubing drilling with supercritical carbon dioxide," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 7(4), pages 745-755, August.
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