In order to clean residue left in the bore of the drill pipe after pumping cement or drilling fluids a sponge foam wiper ball is used for cleaning the internal diameter of the drillpipe or tubing
The foam wiper ball is designed to wipe drillpipe or tubing string clean of cement, fluids, or debris, and can be used to separate fluids. These wiper balls are made of natural rubber and can be used in a temperature range of 40°F (4°C) to 302°F (150°C). The ball has a parting stretch of 380 to 440%, which means it can pass through small restrictions without being damaged.
The wiper ball can be loaded into drillpipe or tubing connections. It easily passes through internal upset restrictions such as mechanical setting tools, diverters, and liner running tools, and multiple balls can be pumped if necessary. Foam wiper balls have been used with all types of drilling and displacement fluids.
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