Research on the Erosion Resistance of High-Pressure Liquid–Solid Two-Phase Flow Junction Drilling Spool

During drilling and spraying operations, the main cause of wear and even failure of spools is the impact of rock-carrying fluid on their inner wall. In order to study the erosion condition of high-speed sand-carrying liquid–solid two-phase flow on drilling spools, researchers established an erosion model by selecting a suitable erosion theory, physical model, and boundary conditions. Numerical simulation and analysis were conducted using COMSOL software to investigate the erosion effect of the spool caused by different factors, such as flow rate, particle diameter, and fluid viscosity. The research results show that the erosion rates of drilling spool calculated by Finnie model, E/CRC model, and DNV model are similar. Moreover, the erosion rate is positively correlated with inlet velocity, erosion time, particle size, and particle mass flow rate; and negatively correlated with fluid viscosity. Therefore, in actual drilling operations, it is important to ensure drilling fluid performance and rock debris mass flow rate to carry out safe drilling operations.