DUBI CHEM MARINE INTERNATIONAL EST, is a largest supplier/exporter of ZINC CARBONATE in ABU DHABI DUBAI SHARJAH UAE GULF
The fine particle-size-distribution of zinc carbonate results in a maximum amount of surface
area for fast, efficient sulfide scavenging and is
effective in water-base and oil- or synthetic-base fluids.
Typical Physical Properties
Physical appearance White powder
Specific gravity 3.5
Zinc content 55% minimum
Solubility in water Insoluble
Applications
Under operating conditions, zinc carbonate reacts with sulfides to form zinc sulfide (ZnS),
which has an extremely low solubility in water (0.0096 g/mL). Drilling fluids should not be
acidified; otherwise, hydrogen sulfide could be liberated.
zinc carbonate is effective as a scavenger at the pH levels found in drilling fluids. It is
recommended that a pH above 10 be maintainedb whenever H2S is expected. This high
alkalinity converts the dangerous H2S gas to less toxic bisulfide (HS-) and sulfide (S2-) ions.
The alkaline pH (>10) allows an extra margin of safety.
The initial treatment of zinc carbonate is usually 1.5 to 3 lb/bbl (3.75 to 8.0 kg/m3), depending
on requirements. Subsequent field treatments should be based on approximately 1 lb/bbl (2.85
kg/m3) of zinc carbonate per 800 mg/L of sulfides detected.
One hundred kilograms (kg) of zinc carbonate reacts with approximately 25 kg of hydrogen
sulfide. Use a Garrett Gas Train and proper Dräger tubes to measure the sulfide content.
Zinccarbonate scavenger should be added through the hopper.
The product has a fine particle size and good dispersibility which minimizes reaction time. The
use of excessively high pH (>11.5) should be avoided when using zinc carbonate scavenger in
water-base fluids, as extreme viscosity increases are likely.
Advantages
• Is not pH-dependent; it is effective at alkaline pH, such as 10 to 11, whereas iron materials
are less so
• Helps remove the hazard of dangerous H2S gas escaping to the surface
• Lessens the possibility of hydrogen embrittlement occurring on downhole tubulars
• zinc carbonate can be used in oil- and synthetic-base fluids, but pilot testing is recommended
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