| http://www.w3.org/ns/prov#value | - After defoaming, a gas such air, nitrogen, membrane nitrogen, other nitrogen/oxygen gas mixtures, carbon dioxide, an inert gas, methane, natural gas, exhaust gas, flue gas or other similar gases or mixtures or combinations added to the fluid under conditions to regenerate a stable hydrocarbon drilling fluid foam or a pre-foam capable of producing a stable hydrocarbon drilling fluid foam with or wi
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