Calculation method for rapid sensitivity damage of loose sandstone reservoir with medium and high porosity and permeability

The invention provides a medium-high porosity-permeability loose sandstone reservoir velocity-sensitive damage calculation method, which belongs to the field of petroleum exploration and development, and comprises the following steps: firstly, introducing a concept of a velocity-sensitive damage coefficient, and associating a seepage velocity with permeability; calculating the oil-water two-phase effective viscosity under the current water content; calculating a stratum pressure transmitting coefficient; establishing a single-phase flow unstable seepage formula under the condition of fixed liquid amount; establishing a single-phase flow unstable seepage formula under the constant flow pressure condition; discretizing the pressure control equation by adopting a central display format; and substituting the actual parameters of the target oil field into all the formulas, comparing the actual parameters with the non-speediness-sensitivity condition, and calculating the additional skin caused by speediness-sensiti