Perlite Cement Additive
Perlite cement additive is a light, granular material made from crushed volcanic rock. Its primary use is to lower the density of cement slurries. It can be used at bottomhole temperatures (BHTs) between 40°C and 400°F (4°C and 204°C). Typical concentrations are 1 ft³ Perlite additive/1 ft³ cement or 2 ft³ Perlite additive/1 ft³ cement. Bentonite (Halliburton Gel) can be added to Perlite additive slurries to help prevent separation.
Perlite additive can provide the following benefits:
- It exhibits excellent bridging properties that help control lost circulation.
- Its insulating properties make it useful in thermal cementing compositions.
- Slurries containing Perlite additive cost less per volume because this additive increases the per-sack yield of cement.