The supercritical sand-carrying foam evaluation system is an experimental equipment used to evaluate the sand carrying capacity of supercritical carbon dioxide, which is widely used in the field of oil and gas exploitation. The system can simulate the sand carrying performance under different fracture conditions, and provide a scientific basis for optimizing the fracturing construction plan. Supercritical carbon dioxide generation: Through high-pressure pumps and heating devices, supercritical carbon dioxide is generated. Sand Addition and Dosing Module: The sand and dosing speed can be independently controlled to simulate different working conditions in the actual fracturing process. Sand Carrying Observation and Simulation: Observe the flow and diversion of sand in real time by visualizing fracture plates and high-speed cameras. Friction test: Measure the friction performance of supercritical carbon dioxide fluids at different temperatures and pressures. Recycling of experimental materials: The carbon dioxide and sand after the experiment can be recycled to reduce costs.

1. Simulation test room
size and structure: inner diameter Ф200 mm, total height 1000 mm (reservoir height 248 mm, sea layer height 752 mm), including sediment simulation room and seawater simulation room.
Safety performance: the maximum safe working pressure is 20 MPa, and the safe working temperature range is -15~80°C.
Sterilization capacity: The sediment simulation room is equipped with autoclaving conditions to meet the needs of the experiment.
2. Hydrate monitoring and leakage behavior simulation
Monitoring method: Plug-in resistivity method and temperature field monitoring are adopted.
Leakage simulation: It supports gas flow control function, and can realize a variety of methods such as center point quantitative injection, multi-point quantitative injection and horizontal seepage direction fluid injection.
3. Pressure & Temperature Sensing System
Pressure Sensing: Measurement accuracy ±0.1% F.S, real-time transmission of pressure data.
Temperature sensing: The temperature field at the bottom of the sediment kettle is designed, with a total of 48 temperature measurement points in the upper, middle and lower layers, with a measurement accuracy of ± 0.1°C, and real-time transmission of temperature data.
4. High and low temperature water bath system
Volume and temperature range: the volume is not less than 40 L, and the safe working temperature range is -10~80°C.
Temperature control function: The seawater layer and the sea mud layer have separate temperature control function to ensure the accurate control of the experimental environment.
5. Methane leakage alarm device
Safety function: It has a methane gas leakage alarm in case of emergencies to ensure the safety of the experiment.
6. Data acquisition and control
Data acquisition: resistivity system, temperature sensing system, pressure sensing system can all transmit data in real time.
Control software: the interface is simple, the operation is simple, and the equipment workflow chart corresponds, which is convenient for experimental operation and data management.