Multi-slug plugging agent performance evaluation method

The invention discloses a method for evaluating the performance of a multi-slug plugging agent, which comprises the following steps of: displacing an artificial rock core with saturated formation water by using the plugging agent through a rock core displacement experiment, and testing the distribution state of the plugging agent after saturation and expansion in the rock core under different injection pressures by using a nuclear magnetic resonance testing technology; and evaluating the distribution rule of different blocking agents in the core matrix or the fracture. Firstly, an artificial rock core containing artificial cracks is manufactured, built-in cracks do not penetrate through the rock core, and the rock core is saturated through simulated formation water; secondly, during a rock core displacement experiment, setting the confining pressure to be 15-20MPa, carrying out a plugging agent continuous displacement experiment on the rock core to ensure that the artificial rock core is completely saturated