| http://www.w3.org/ns/prov#value | - A drilling fluid comprising a stable oil in water emulsion consisting of:(a) 50-96%v aqueous phase; (b) 3-40%v oil phase; (c) 1-10%v of a surfactant belonging to the class of ethoxylated amines having the formula: ##STR6## in which R is a hydrophobic aliphatic group and x and y are integers ???1, the sum of which is in the range of from 4-20; (d) 1-15 wt% potassium salt in the aqueous phase; (e) c
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