| http://www.w3.org/ns/prov#value | - The amount of solid weighting material, which is optional, can be from about 0.5 pound per barrel to about 100 pounds per barrel. [0080] Another optional ingredient in the drilling fluids of the present invention is a wetting agent which can be helpful in emulsifying the alkali metal tungstate fluids with the hydrocarbon-based external fluids.
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