Method and device for establishing plunger gas lift dynamic leakage calculation model

The invention discloses a method for establishing a plunger gas lift dynamic leakage calculation model, and relates to the technical field of drainage gas recovery. On the basis of flow field stress analysis between the plunger and a tubing well gap in the plunger movement process, a liquid phase velocity model under the action of pressure difference and plunger movement shear is established on the basis of N-S. Compared with the mode that pressure difference leakage and shear leakage are simply superposed, the established liquid phase velocity model is closer to the leakage mechanism of the plunger. And establishing a leakage calculation model according to the relative speed of the plunger and a liquid phase, obtaining the leakage speed of the cylindrical plunger containing turbulent sealing through analogue simulation, and finally determining a leakage correction coefficient and correcting a numerical calculation model in combination with a numerical model and a simulation result to obtain a dynamic leakage