Zinc Carbonate is used as an H2S scavenger in water based drilling muds. As a pre-treatment, concentrations vary from 6.0-14.0 kg/m³ depending on the severity of the expected sour gas.
To effectively control the carbonate added, add approximately 0.25 kg of lime for every kilogram of Zinc Carbonate added to the mud. Approximately 1.0 kg/m³ of Zinc Carbonate is required to remove 256 mg/L of dissolved H2S.
Zinc Carbonate can cause rheological and alkalinity problems in bentonite based mud systems and on wells where there are elevated mud temperatures.
