Constant volume depletion experiment method and device for condensate gas reservoir non-equilibrium phase influence

The invention discloses a constant volume depletion experiment method and device for condensate gas reservoir unbalanced phase influence. The constant volume depletion experiment method for condensate gas reservoir unbalanced phase influence comprises the following steps: firstly, calibrating interval transit time at two ends of a sand filling pipe under different condensate oil saturations, and fitting to obtain a corresponding calculation relational expression; secondly, simulating actual non-equilibrium phase change characteristics of the condensate gas reservoir in a sand-filled pipe by adopting a constant-volume depletion experiment method, and obtaining a relation curve of gas condensate saturation and pressure at different pressure drop speeds through depletion type development simulation at different pressure drop speeds; and finally, analyzing and fitting to obtain a change curve of the maximum gas condensate saturation along with the pressure drop speed. Compared with the prior art, the non-equilibr