Erosion damage risk evaluation method for natural gas well sand control well completion screen pipe

The invention provides an erosion damage risk evaluation method for a natural gas well sand control well completion screen pipe. The erosion damage risk evaluation method is used for evaluating the erosion resistance of the screen pipe and whether the erosion damage risk exists in an actual well or not. The method comprises the steps that S1, the erosion index Kc of a target screen pipe is obtained; S2, the maximum gas erosion velocity of a target gas well is calculated; S3, the erosion damage speed and erosion damage time of the target screen pipe under the target well bottom condition are calculated; S4, the production time when the outer annulus of the screen pipe is filled with stratum sand is calculated; and S5, a screen pipe erosion risk index of the target gas well is calculated, and erosion risk grade evaluation is carried out. The evaluation method is simple and easy to implement, the complexity of the erosion test of the screen pipe is reduced, the cost and the workload are saved, a convenient way i