Novel method for evacuating saturated water from large-size light plate rectangular rock core

The invention belongs to the technical field of oil displacement of oil fields, and relates to a novel method for evacuating saturated water from a large-size light plate rectangular core, which comprises the following implementation steps of: (1) weighing the mass of the light plate core by using an electronic balance, and recording as Gdry; (2) placing the rock core in a special container, pouring simulated water into the container, and ensuring that the water surface is higher than the horizontal plane of the rock core by more than 2cm; (3) placing the container in a large pressure container, closing an upper cover of the container, and checking the sealing effect; the rock core is completely exposed in the vacuum environment in the saturated water pumping process, the contact area between the rock core and vacuum and water is increased by 28.67 times, and the water saturation effect is obviously improved; a plurality of cores can be vacuumized and saturated at one time, and the steps of vacuumizing and wa