AbstractThis paper instructs the working principle of the well washing device and its parameter optimization in practical applications. A fluent fluid engineering simulation software was used to establish the calculation model of the bottom flow field. The fluid area inside the well washing device with different orifice diameters at 30, 40, 50, and 60 degrees was simulated, and the gas‐solid two‐phase distribution cloud map and corresponding data were obtained. The results show that the cleaning effect is optimal and with no dead angle when θ = 30° and d = 4 mm. Moreover, the optimization design using simulation technology is reliable and simple. Based on this conclusion, a patent for a cyclone reverse circulation well washing device was invented. Under the same conditions, the above results were also verified by comparison with ordinary washing devices.