THERMAL SCIENCE

International Scientific Journal

Chengzheng Cai

,

Bo Wang

,

Yinrong Feng

,

Yanan Gao

,

Yugui Yang

DOWNHOLE HETEROGENEOUS HEAT TRANSFER CHARACTERISTICS AND ROCK STRESS DISTRIBUTIONS INDUCED BY LIQUID NITROGEN JET

ABSTRACT
Liquid nitrogen jet is expected to provide a new idea for the breaking of deep dry hot rock due to its low temperature. In order to study the characteristics of het­erogeneous temperature and stress fields during liquid nitrogen jet impingement, the downhole flow and stress characteristics induced by liquid nitrogen jet were studied by a thermal-hydraulic-mechanical coupling model. The results showed that under the same conditions, the potential core and the maximum velocity of liquid nitrogen jet were higher than water jet. The liquid nitrogen jet had a larger region of high turbulent kinetic energy, and the heat transfer efficiency with the bottom rock was obviously higher than water jet. Compared with the water jet, the liquid nitrogen jet formed a tensile stress zone in the bottom rock. The research was expected to provide a theoretical basis for the rock breaking mechanism of liquid nitrogen jet.
KEYWORDS
liquid nitrogen, jet, drilling, flow field, stress field
PAPER SUBMITTED: 2024-03-15
PAPER REVISED: 2024-03-28
PAPER ACCEPTED: 2024-05-16
PUBLISHED ONLINE: 2024-09-28
DOI REFERENCE: https://doi.org/10.2298/TSCI2404429C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 4, PAGES [3429 - 3434]
REFERENCES
  1. Liu, W. L., et al., Drilling Difficulties and Solutions for Hot Dry Rock Geothermal Development, China Petroleum Machinery, 43 (2015), 43, pp. 11-5
  2. Li G., et al., Status and Challenges of Hot Dry Rock Geothermal Resource Exploitation, Petroleum Science Bulletin, 7 (2022), 03, pp. 343-364
  3. Li, G., et al., Research and Applications of Novel Jet Techniques in Well Drilling, Completion and Fracturing, Science Foundation in China, 22 (2014), 2, pp. 68-80
  4. Cai, C., et al., Numerical Simulation of the Flow Field Structure of Liquid Nitrogen Jet, Thermal Science, 23 (2019), 3A, pp. 1337-1343
  5. Huang, Z., et al., Mechanism of Drilling Rate Improvement Using High-Pressure Liquid Nitrogen Jet, Petroleum Exploration and Development, 46 (2019), 4, pp. 768-775
  6. Zhang, S., et al., Experimental Study of Thermal-Crack Characteristics on Hot Dry Rock Impacted by Liquid Nitrogen Jet, Geothermics, 76 (2018), Nov., pp. 253-260
  7. Yang, X. J., An Insight on the Fractal Power Law Flow: From a Hausdorff Vector Calculus Perspective, Fractals, 30 (2022), 3, 2250054
  8. Yang, X. J., et al., On the Theory of the Fractal Scaling-Law Elasticity, Meccanica, 57 (2022), July, pp. 943-955
  9. Yang, X. J., et al., A New Insight to the Scaling-Law Fluid Associated with the Mandelbrot Scaling Law, Thermal Science, 25 (2021), 6, pp. 4561-4568
  10. Batchelor, G. K., An Introduction Fluid Dynamics, Cambridge University Press, Cambridge, UK, 2000
  11. Zhang, S., et al., Numerical Analysis of Transient Conjugate Heat Transfer and Thermal Stress Distribution in Geothermal Drilling with High-Pressure Liquid Nitrogen Jet, Applied Thermal Engineering, 129 (2018), Jan., pp. 1348-1357
PDF VERSION [DOWNLOAD]
Downhole heterogeneous heat transfer characteristics and rock stress distributions induced by liquid nitrogen jet

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence