Heavyweight additives are used when cementing through overpressured zones. The most common types of additive are:
• Barite (barium sulphate) – this can be used to attain slurry densities of up to 18ppg. It also causes a reduction in strength and pumpability.
• Hematite (Fe2O3) – The high specific gravity of hematite can be used to raise slurry densities to 22 ppg. Hematite significantly reduces the pumpability of slurries and therefore friction reducing additives may be required when using hematite.
• Sand – graded sand (40 – 60 mesh) can give a 2 ppg increase in slurry density.

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