Definition - What does Zinc Carbonate mean?
Zinc Carbonate (ZnCo3) is a neutral salt that is used as a sulfide scavenger in water base mud. When compared to zinc basic carbonate, Zinc Carbonate is less soluble and is also slow in reacting with sulfide ions. A Garrett Gas Train is used to analyze soluble sulfides in mud filtrates wherein one lb/bbl per 500 milligram per liter sulfide ion is tested.
Petropedia explains Zinc Carbonate
If Zinc Carbonate is used as a pre-treatment in the anticipation of hydrogen sulfide gas, then in that case the quantity of zinc carbonate added to the system should not be more than 5 lb/bbl or 14.27 kg per cubic meter. In order to effectively control the alkalinity from the carbonate added, 0.25 lb/bbl or 0.71 kg per cubic meter lime should be added for every 1 lb/bbl or 2.85 kg per cubic meter of zinc carbonate. Approximately one pound per barrel or 2.85 kg per cubic meter of zinc carbonate is needed to remove 500 milligram per liter of the sulfide ion.
Some other scavengers used apart from zinc carbonate are:
- Zinc chelate
- Zinc chromate
- Ironite sponge
- Copper carbonate
- Zinc oxide