Method for determining reasonable flowback pressure difference range of high-water-content tight sandstone gas reservoir after pressure

The invention relates to a method for determining a reasonable flowback pressure difference range after pressure of a high-water-content tight sandstone gas reservoir, which comprises the following steps of: respectively determining reservoir particle migration damage induced by rapid flowback after pressure and critical flowback pressure difference generated when a large amount of formation raw water is converted into movable water through an indoor evaluation experiment; the smaller value is selected as the upper limit of the reasonable flowback pressure difference range, and the flowback pressure difference corresponding to the value that the curve slope of the flowback rate and the permeability damage rate tends to be 0 in the relation curve of the flowback pressure difference, the flowback rate and the permeability damage rate serves as the lower limit of the reasonable flowback pressure difference range after the high-water-content tight sandstone gas reservoir is pressed; therefore, the numerical range