Cementing plugs are the rubber plugs which are used to separate the cement slurry from fluids. These are designed to match the industry standard.
The main features are:
- It is compatible with oil-based mud, water-based mud, and synthetic-based mud system.
- These are available in different size combinations and several types of design.
Working of Plugs
Plugs plays a vital role during cementing operations. Plugs minimize the contamination of cement by removing dispersed mud and mud sheath from the casing inner diameter.
Before the cement slurry and behind the space, a bottom plug is pumped. As the plug moves down the string, it removes the left dispersed mud from the inner diameter of the casing.
A diaphragm on the plug gets ruptured due to the pressure exerts when the bottom plug seats are at the float collar. This helps cement to flow through it.
It twists the corner of the hole or toe end, located at the bottom of the horizontal well.The annular space between the casing and the formation is then filled.
By this way, after the full volume of cement has been pumped, a top plug is dropped and pumped behind the slurry.
The top plug then removes the leftover cement from the inner diameter of the casing and reach at the float collar.
It then rests on the bottom plug to cause a pressure. It also indicates that the cement has been displayed.
Both the top and bottom plugs are always different. Bottom plugs are red while top plugs are black.