Structural features: The cementing rubber plug series is divided into ordinary cementing rubber plugs, upper and lower rubber plugs for double-plug cementing and upper, middle and lower rubber plugs for double-stage cementing. Standard cement plugs are suitable for all kinds of floating hoops and shoes; anti-rotation cement plugs are suitable for anti-transformation floating hoops and shoes.​​

The structure of the anti-rotation cementing plug is not complicated and consists of a core, a rubber bowl and a cord layer. Among them, the anti-rotation cementing plug core is usually made of cast aluminum, pig iron, hard rubber, etc.; the rubber bowl is made of rubber, and then vulcanized on the inner core to form a rubber plug.
The function of rubber plug: when all the cement slurry is poured, press the rubber plug, it will go down against the cement slurry to scrape the cement slurry adhered to the inner wall of the casing, and prevent the mixing of the displacement drilling fluid and the cement slurry , to avoid the pollution of cement slurry at the tail and ensure the quality of cement cementation at the bottom. When it reaches the spoiler, it shows the pressure, and the cementing operation ends.
The function of the lower rubber stopper: before the cement slurry is injected, the lower rubber stopper is released to separate the cement slurry and the pre-fluid. Reduce the pollution of the cement slurry injected into the casing. At the same time, wipe off the drilling fluid adhering to the inner wall of the casing, and push it to the front of the rubber plug. When the rubber stopper reaches the baffle, a small pressure can be applied to crush the rubber diaphragm on the rubber stopper, so that the cement slurry flows through the rubber stopper, and is displaced to the casing and the casing through accessories such as swirl shorting. in the annular space between the well walls.