The ultra-low temperature true triaxial hydraulic fracturing simulation device is an experimental equipment used to simulate the rock fracture characteristics of the formation under the action of stress in different directions, and its main function is to study the initiation, propagation and steering law of hydraulic fracturing fractures by accurately controlling the stress loading in X, Y and Z directions. Such devices usually include key components such as a true triaxial loading system, an acoustic emission monitoring system, and a high-pressure pumping system, which can realize realistic in-situ stress simulation, and combine acoustic emission technology to monitor the formation and propagation of cracks in real time.

1. True triaxial stress loading: The device can independently control the stress in three directions (X, Y, Z axis) to simulate the real stress state of the formation, so as to more accurately study the cracking initiation and propagation law of fractures.
2. Acoustic emission monitoring: Equipped with an acoustic emission monitoring system, the formation and expansion of micro-fractures in the fracturing process can be monitored in real time, and the location and expansion parameters of the fractures can be obtained by analyzing the acoustic emission signal.
3. Hydraulic fracturing experiment: The device can inject clean water or unconventional fracturing fluids (such as gelatin, linear glue, etc.) to study the distribution of different fluids in fractures, their conductivity and their influence on fracture propagation.
4. Data acquisition and analysis: Through computer control and data acquisition system, the accurate monitoring and analysis of the experimental process is realized, including the recording and storage of data such as crack propagation path, crack length, permeability change, etc