## 4 Experiment and Performance Evaluation of the New Screen Sand Production
### Testing Experiment  
A set of sand control simulation experimental devices have been established, as shown in Figure 4. It simulates the plugging, sand production of the sand screen pipe in sand control. We comprehensively evaluated the sand control effect through the calculations and analysis of experimental data, which provides guidance for the optimization of sand control screen pipes and the formulation of optimal sand control schemes.  
1. Experiment purpose: The purpose is to understand the sand control effect of the screen on the formation sand sample through simulation experiments, and to evaluate the production capacity characteristics and sand production amount of the screen under different sand control accuracy, and preferably determine the structure and sand control accuracy of the sand screen pipe.
2. Experimental principle: By testing the inlet pressure and outlet flow rate of the screen under the state of clear water circulation, as well as the inlet pressure, outlet flow rate and weight of the output sand sample after adding the formation sand sample under the state of clear water circulation condition, the pressure and flow rate after the clear water state and the sand state are analyzed to evaluate the plugging situation of the screen, and the sand control accuracy with the better sand control effect is optimized compared with the amount of sand. By analyzing the sand production amount when a stable state is reached after sand addition, the sand control effect of the screen can be judged, and the structural design of the sand control screen with stable production capacity and a better sand control effect is optimized.
3. Experiment content: Mainly aiming at the condition of adding formation sand samples during only water production for the Class A screen and Class B screen. The bottomhole fluidity and anti-plugging performance of the screen are tested, and the selection of sand control accuracy of the screen pipe and the evaluation of the comprehensive performance of the screen overflow are selected through the analysis of the test results, and the appropriate sand control plan is optimized.
4. Experimental equipment: It mainly comprises a booster pump, a pressure and flow monitoring table, a filtration device and main valves, as shown in the following Figure 4.
5. Experimental sand screens: Class A screens 1 (50-60 mesh), Class A screens 2 (60-70 mesh), Class A screens 3 (70-80 mesh), Class A screens 4 (70-80 mesh), Class A screens 5 (70-80 mesh), Class A screens 6 (50-60 mesh); Class B Screen 1 (40-70 mesh) and Class B Screen 2 (30-50 mesh), in which the same mesh number/pore size of the sand screen have different internal structures.
6. Experimental procedures: * Experiment on the flow performance of screen with clean water: The experimental device is used to carry out the screen water overflow experiment. The water pressure is tested, and after the pressure is stabilized, and the inlet pressure and outlet flow are recorded. * Experiment on the flow performance of the screen pipe with sand: Add 100 g of formation sand into the experimental screen pipe. Conduct a pressure test with clean water, control the inlet pressure, measure the outlet flow after the pressure stabilizes. The circulation time is 45 min, and stop the pump, and record the experimental data. * Collect the formation sand after sedimentation, dry it and weigh it.