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What Is The Purpose Of Cementing Plugs?

2018-05-24 18:42:12

Cementing plugs help during cementing operations for removing the dispersed mud and mud sheath from the casing inner diameter. It minimizes the contamination of cement. Cementing plugs wipes any remaining dispersed mud from the inner diameter of the casing as it moves down the string.


The bottom plugs are designed to replace conventional cementing plug system. Therefore, these possesses a greater compressive strength can withstand a bottom hole temperatures of upto 250° F for an extended period of time. Both the top and bottom plugs are always different. Bottom plugs are red while top plugs are black.


Cementing Plugs


Bottom plug being a part of cementing system, it is used to pump ahead of the cement slurry and behind the spacer. Once the full volume of cement has been pumped, a top plug is dropped and pumped behind the slurry. The top plug wipes cement from the inner diameter of the casing and seats at the float collar, nest it rests on the bottom plug, causing a pressure to increase at the surface.


When the bottom plug seats at the float collar, differential pressure ruptures a diaphragm on the plug, allowing cement to flow through, turn the corner at the bottom of the hole or toe end of a horizontal well and fill the annular space between the casing and the formation. A plug is most frequently used to repair it when a minor defect is found in a new vessel prior to factory shipment.


Cementing Plugs are engineered by the finest materials for greater reliability. Our design of cementing plugs is a seal against the casing wall to prevent mixing of cement slurry and displacement fluid. Before the cement slurry, a bottom rubber plug is pumped as the plug moves down the string. It helps in removing the left dispersed mud from the inner diameter of the casing.

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