Study on erosion performance evaluation and law of high-pressure liquid-solid two-phase flow throttle valve

Throttling valves are critical for effective bottomhole pressure control in high-pressure gas wells. This study evaluates the erosion resistance of three common valve types - cylindrical, wedge, and orifice plate - through numerical simulations using the discrete phase model and field experiments. Results reveal that cylindrical valves offer superior erosion resistance. Key factors such as flow velocity, fluid viscosity, particle diameter, and sand content significantly influence erosion rates. A PSO-SVM-based prediction model was developed, achieving over 90% accuracy. The findings suggest cylindrical valves are optimal as primary throttling devices, with wedge valves as auxiliary options, while orifice plate valves are less suitable for 105 MPa choke manifolds in high-pressure wells. Increased flow velocity, sand content, and particle size were identified as the main contributors to erosion rate escalation. These insights support valve selection strategies that enhance well control reliability and erosion resistance in harsh operating environments.