Zinc Bromide

Definition - What does Zinc Bromide mean?

Zinc Bromide is an inorganic compound that is used in well completions and workover operations of a well. It shares many similar properties with zinc chloride. It is 75% clear brine and has the chemical formula ZnBr2. It is majorly used in places where high density of up to 20 pounds per US gallon is required.


  • Appearance – clear
  • Assay – 73 to 79 percent
  • pH (1:10 dilution) – 5 to 6
  • Specific Gravity – 2.3 to 2.5

Petropedia explains Zinc Bromide

When oil or gas wells are in the drilling phase or when any workover operations of a well are being performed, zinc bromide solutions are used to help displacing the drilled mud. The extremely dense brine solution gives the zinc bromide fluid its weight of 20 pounds per US gallons which makes it useful in holding back flammable oil and gas particles in high pressure well conditions. However, the brine solution becomes very acidic and thus extra care is needed when using zinc bromide as it can lead to corrosion.

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