Three-type oil reservoir classification well concentration design method based on system hydrodynamic radius

The invention relates to a three-type oil reservoir classification well concentration design method based on a system hydrodynamic radius. The method mainly solves the problems that only the lower limit value of the concentration is given and the reasonable upper limit value is not given when the concentration of a single well is designed according to an existing method, and injection is difficult and even the oil layers are blocked due to over-high injection concentration of three types of oil layers with small pore throat radiuses. Comprising the following steps: 1, obtaining a classification well K80; 2, calculating the pore throat radius corresponding to K80; 3, determining different hydrodynamic radius limit values corresponding to the classification well K80 according to the specific value of the pore throat radius/hydrodynamic radius and the flow state; 4, testing hydrodynamic radiuses of the injection system under different concentration conditions; 5, determining a concentration range suitable for th