Deepwater horizontal well gravel packing maximum fillable length design method, computer equipment and readable storage medium

The invention discloses a design method for the maximum filling length of gravel filling of a deepwater horizontal well. The design method comprises the steps that the pump displacement Qp, the sand-carrying fluid density rhof and the analysis design interval of the gravel density rhop are given; the analysis design interval of the pump displacement Qp is divided into N discrete point value pump displacements Qp; dividing the analysis design interval of the sand-carrying fluid density rho f into M discrete point value sand-carrying fluid densities rho f; dividing the analysis design interval of the gravel density rho p into L discrete point value gravel densities rho p; the N discrete point value pump displacements Qp, the M discrete point value sand-carrying fluid densities rho f and the L discrete point value gravel densities rho p are combined to obtain F combined parameters, and for the ith combined parameter, the maximum fillable length Li under the combined parameter is calculated and searched; and the