1. Overview
The indoor experimental simulation of hydraulic fracturing is to use artificial test pieces or natural outcrop cores to process them into cubic test pieces of a certain size with fluid injected into the wellbore in the middle, then put the test pieces into a large-size true triaxial test system, load the triaxial principal stress, and use the intermediate wellbore to inject liquid until the crack extends to the test piece boundary. In the process of the experiment, the characteristics of crack expansion are dynamically monitored by acoustic emission instrument, and the distribution of fracturing cracks can be further evaluated by using high-energy CT scan or directly knocking the test piece after the experiment, which can accurately understand the mechanism of hydraulic fracturing crack expansion in shale reservoir.
However, due to the limitations of the specimen size and experimental instruments, it is difficult for indoor experiments to simulate the hydraulic fracturing process under the actual conditions of the reservoir, and the natural fracture distribution of small size specimens may be very different from the distribution of the actual formation, resulting in great limitations of indoor experiments.
Device functions and features:
1. It can simulate the expansion of fracturing cracks under different rock samples, in-situ stress, flow rate, perforation and other conditions such as shale and sandstone.
2. Supercritical carbon dioxide fracturing simulation experiment can be carried out.
3. Synchronous and asynchronous fracturing of 2 wells and staged fracturing of single well can be carried out.
4, can be carried out under the condition of triaxial stress crack gas detection conductivity test.
Main technical parameters of 2.
1. Sample specification: 400 × 400 × 400mm
2. Triaxial loading stress: 30MPa
3. Maximum fluid injection pressure: 65MPa
4. Maximum fluid displacement: greater than 60 ml/min
5. Measurement range of internal displacement: 0~20mm, accuracy ± 0.003 ㎜