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Oilfield Glossary
Oilfield Glossary
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zinc basic carbonate

1. n. [Drilling Fluids]
A neutral double salt of zinc carbonate and zinc hydroxide in 2-to-3 stoichiometric proportions, 2ZnCO3·3Zn(OH)2. Zinc basic carbonate is used as a sulfide scavenger for water-base drilling fluid in a concentration of about 0.1 lbm/bbl per 50 mg/L GGT sulfides (determined by Garrett Gas Train sulfide analysis of the filtrate). The zinc cation reacts with the sulfide anion to form inert zinc sulfide (ZnS).