Visual long core sand filling pipe experimental device

The utility model discloses a visual long rock core sand filling pipe experiment device which comprises a transparent cylinder body with an annular hollow inside, threads at two ends of the transparent cylinder body are respectively connected with a left sealing cover and a right connecting cover, the center of the right connecting cover is sleeved with a screw plug in a threaded mode, one end of the screw plug extends into the transparent cylinder body, and the periphery of the end of the screw plug is attached to the inner wall of the transparent cylinder body. Pressure measuring interfaces communicated with the annulus are uniformly formed in the transparent cylinder body; and the sand filling models with different lengths in the transparent cylinder are compacted and sealed by rotating the screw plug. The pressure measuring connectors connected with the annulus are evenly arranged on the transparent cylinder, pressure changes of fluid in different rock core sections of the sand filling model are monitored