| http://www.w3.org/ns/prov#value | - The fluids include a brine having dissolved therein a zinc salt such as zinc bromide, and optionally one or more additional water soluble salts, a viscosifier which is a high surface area silica, a biopolymer viscosifier, a fluid loss control additive which is preferably a starch derivative, zinc carbonate, and optionally, an alkaline buffer, a polar additive and a bridging agent.
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