Effects of carbon dioxide blasting on hot dry rock reservoirs considering thermal damage.

• Numerical simulation for the action range of carbon dioxide blasting-induced cracking of HDR was conducted, in which the cooling effect of drilling fluid on the HDR reservoir close to the wellbore is taken into consideration. • The reservoir's material properties in the damaged section were established using fitting functions with temperature difference. Additionally, the temperature field of the reservoir in the affected region was established using temperature distribution functions. • The process of carbon dioxide blasting to stimulate HDR reservoir is modelled. The findings demonstrate that multiple stress concentrations occur during the carbon dioxide blasting process that causes HDR to crack. • The blasting crushing zone's scope is greatly influenced by the beginning temperature, but the fracture zone's scope is mostly unaffected. The extent of the crushing zone, which primarily determines the distribution of the blasting fracture zone, is not significantly impacted by the pressure plate's thickness. A cutting-edge technique for igniting hot dry rock (HDR) reservoirs is carbon dioxide blasting. The cooling effect of the drilling fluid was taken into consideration during a numerical simulation of the action range of carbon dioxide blasting-induced cracking. A temperature difference was used to determine the reservoir's material properties. Additionally, temperature distribution functions were used to create the temperature field in the reservoir. The blasting load is calculated using the pertinent theories and formulas of explosive blasting, and the process of blasting carbon dioxide to excite the HDR reservoir is modeled using COMSOL. The findings show that several stress concentrations take place during the blasting process. The fracture zone is created by the tensile stress concentration outside of the crushing zone, whereas the compressive stress concentration close to the blast hole creates the crushing zone. Furthermore, the effectiveness of carbon dioxide blasting fracturing would be affected by the beginning temperature and pressure plate thickness. Although the scope of the fracture zone is mostly unchanged, the initial temperature has a significant impact on the blasting crushing zone. The size of the crushing zone, which determines how the blasting fracture zone is distributed, is unaffected by the pressure plate's thickness. [ABSTRACT FROM AUTHOR]