Oilfield Glossary

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Note: Definitions provided on this website are for reference purposes only. Engineers and professionals should independently confirm all information using industry standards.

Cementing spacer

A spacer is a calculated volume of fluid pumped between the drilling mud and the cement slurry. It serves two functions: to separate incompatible fluids (mud and cement) and to clean the hole.

Spacers are often weighted and viscosified to aid in displacing the mud. They are water-wetting agents to prepare the casing and formation surface for bonding.

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