It may, and I say may, reduce the need for bromine compounds, but I doubt it will eliminate the need. I suspect bromine compunds are used for more than reasons than just as a biocide.
"The bromides of calcium, sodium, and zinc account for a sizable part of the bromine market. These salts form dense solutions in water that are used as drilling fluids sometimes called clear brine fluids" from Wiki.
See page 290, Calcium bromide in deep drilling, drilling fluids use.
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