Method and device for predicting water breakthrough time of gas well of heterogeneous edge water gas reservoir

The invention relates to a method and a device for predicting the water breakthrough time of a gas well of a heterogeneous edge water gas reservoir, and belongs to the technical field of gas reservoir exploitation. According to the invention, the method comprises the steps of establishing relation between gas well water breakthrough time and edge water distance according to the gas and water two-phase seepage theory, determining an approximate homogeneous edge water gas reservoir water breakthrough time prediction model; according to the geological characteristics of the existing multi-layer commingling production heterogeneous edge water gas reservoir, determining the water breakthrough time prediction model according to the earliest water breakthrough characteristic of a small layer with the maximum permeability of the heterogeneous gas reservoir; establishing a prediction model of the water breakthrough time of the small layer with the maximum permeability, and establishing a prediction model of the water