TY - JOUR
TI - Numerical simulation and parameter analysis of liquid nitrogen cooling for high temperature granites
AU - Zhou Chun-Bo
AU - Su Shan-Jie
AU - Cai Cheng-Zheng
AU - Gao Feng
JN - Thermal Science
PY - 2025
VL - 29
IS - 2
SP - 1463
EP - 1470
PT - Article
AB - Liquid nitrogen stimulation has important application value in the fields of  deep geothermal development, and unconventional oil and gas reservoir  exploitation. It is difficult to experimentally observe the evolution of  temperature and cryogenic-induced stress inside the rock during the cooling  process. Numerical simulation complements the experimental difficulties. In  this study, the liquid nitrogen cooling process of high temperature granite  under different parameters is studied by numerical simulation. The results  show that a higher heat transfer coefficient and model initial temperature  enhance the heat transfer efficiency of the cooling process, thus resulting  in more severe cryogenic-induced stresses. Young's modulus and expansion  coefficient are independent of the temperature distribution during the  cooling process. Higher Young's modulus amplifies stress under identical  thermal contraction constraints. Higher expansion coefficients enhance the  thermal strains and thermal strain incompatibility, thus elevating the  cryogenic-induced stresses. This study will provide the theoretical basis  for the application of liquid nitrogen in reservoir stimulation.