Wiper plugs
Cementing & Well Integrity
Wiper plugs are rubber/elastomer plugs used during cementing to separate fluids and clean the inside of the casing. The 'bottom plug' goes ahead of the cement to wipe drilling mud off the casing wall and separate mud from cement.
The 'top plug' follows the cement, separating it from the displacement fluid. When the top plug lands on the bottom plug at the float collar, pressure rises, signaling the job is complete ('bumping the plug').
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