Numerical simulation and rapid judgment method for overall pressure test of medium-deepwater submarine pipeline

The invention relates to the technical field of submarine pipeline pressure testing, and particularly discloses a numerical simulation and rapid judgment method for medium-deep water submarine pipeline overall pressure testing. The numerical model established by the method comprises a residual air content judgment numerical model, a pressure drop-temperature drop related numerical model and a pipeline leakage rate and pressure drop related numerical model. According to the method, a numerical simulation method is used for simulating heat transfer and pressure change of subsea pipeline fluid and leakage working conditions of leakage points with different hole diameters, judgment programs are established, and simulation results of pipeline pressure drop caused by temperature drop and subsea pipeline pressure drop under the leakage working conditions are comprehensively compared with actual parameters in the subsea pipeline pressure testing process; and whether the subsea pipeline pressure test is qualified or n