Drilling Industry Glossary

Concentration

Concentration for cement or spacer additives. There are only 2 kinds of additives: liquid or solid.

1. Cement additives:

   For liquid, there are 2 units: (gps), (gphs)

   • (gps) - gallon per sack of cement
   • (gphs) - gallon per hundred sacks of cement

   For solid, there are 4 units: (% bwoc), (lb/sk), (lb/gal), (% bwow)

   • (% bwoc) - weight percent (by the weight of cement)
   • (lb/sk) - pound per sack of cement
   • (lb/gal) - pound per gallon of water in the mixture, not the cement slurry
   • (% bwow) - weight percent (by the weight of water)
2. Spacer additives:
   • For liquid, there is 1 unit: (gpb) - gallon per barrel
   • For solid, there is 1 unit: (ppb) - pound per barrel